WO1999065251A2 - Apparatus and method for detecting calling location of radio signal using short pulse - Google Patents

Apparatus and method for detecting calling location of radio signal using short pulse Download PDF

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Publication number
WO1999065251A2
WO1999065251A2 PCT/KR1999/000279 KR9900279W WO9965251A2 WO 1999065251 A2 WO1999065251 A2 WO 1999065251A2 KR 9900279 W KR9900279 W KR 9900279W WO 9965251 A2 WO9965251 A2 WO 9965251A2
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WO
WIPO (PCT)
Prior art keywords
radio signal
strength
signal
calling station
code
Prior art date
Application number
PCT/KR1999/000279
Other languages
French (fr)
Other versions
WO1999065251A3 (en
Inventor
Kwang Hwan Lee
Original Assignee
Kwang Hwan Lee
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kwang Hwan Lee filed Critical Kwang Hwan Lee
Priority to AU41706/99A priority Critical patent/AU4170699A/en
Publication of WO1999065251A2 publication Critical patent/WO1999065251A2/en
Publication of WO1999065251A3 publication Critical patent/WO1999065251A3/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/0009—Transmission of position information to remote stations
    • G01S5/0081—Transmission between base stations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/04—Position of source determined by a plurality of spaced direction-finders
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/14—Determining absolute distances from a plurality of spaced points of known location
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S2205/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S2205/001—Transmission of position information to remote stations
    • G01S2205/008—Transmission of position information to remote stations using a mobile telephone network

Definitions

  • the present invention relates in general to an apparatus and a method for detecting calling location of radio signal using short pulse from a calling station
  • One technique is a method for detecting the direction of calling signal using width of antenna beam of a conventional directional antenna, wherein an angle detector detects the direction of calling signal when the calling signal is detected by the rotation of the directional antenna.
  • an angle detector detects the direction of calling signal when the calling signal is detected by the rotation of the directional antenna.
  • Still another is a method using radar.
  • a signal is emitted from radar, received at a portable calling system and re-emitted from the portable calling system, thereby measuring location of portable calling system using the delay of signal.
  • the method has problems that the system for implementing the method costs much and the mixture of signals can happen due to multiple reflection of signal
  • an object of the present invention is to provide an antenna system and a method for detecting strength of radio signal and code information of a calling station from the radio signal received at a given number of antenna systems, the radio signal being short pulse
  • Another object of the present invention is to provide an apparatus and a method for detecting location of calling station by using strength of radio signal and code information of a calling station detected from the radio signal received at a given number of antenna systems, the radio signal being short pulse
  • an apparatus for detecting calling location of radio signal comprising a plurality of antenna systems, each antenna system having a plurality of antennae, for detecting strength of the radio signal and code of calling station if the radio signal of which the strength is larger than a threshold is received, calling location detecting means for detecting the calling location of radio signal based on relation between distances between the antenna systems and receiving angles, after obtaining the receiving angles of the radio signal received at each the antenna system using difference of the radio signal received at a plurality of the antennae and detected, and output means for receiving the calling location of radio signal and the code of the calling station, and for outputting information of the calling station by retrieving subscriber database based on the code of the calling station and the calling location
  • an apparatus for detecting calling location of radio signal comprising a plurality of antenna systems, each antenna system having a plurality of antennae, for detecting strength of the radio signal and code of calling station if the
  • a method for detecting calling location of radio signal in an apparatus for detecting calling location of radio signal comprising the steps of detecting strength of the radio signal received by a plurality of antennae and code of a calling station at each of antenna system if the radio signal transmitted from the calling station is received measuring receiving angles of the radio signal received at each the antenna system using difference of the radio signal received at a plurality of the antennae in each of the antenna system, detecting the calling location of radio signal based on relation between distances between the antenna svstems and the receiving angles, and displaying the calling location of the radio signal and information of the calling station by retrieving map database and subscriber database based on the code of the calling station and the calling location
  • a method for detecting calling location of radio signal in an apparatus for detecting calling location of radio signal comprising the steps of allowing a neural network to study relation between input and output thereof by operating the calling station at a location, the input being strength of the radio signal received by each of a plurality of antennae in each antenna system, the output being calling location of the radio signal; detecting strength of the radio signal received by the plurality of antennae and code of a calling station at each of antenna system if the radio signal transmitted from the calling station is received, detecting the calling location by inputting the strength of the radio signal detected at each of the antenna in each the antenna system to the neural network, and displaying the calling location of the radio signal and information of the calling station by retrieving map database and subscriber database based on the code of the calling station and the calling location
  • an antenna system for receiving radio signal comprising a plurality of antennae for receiving the radio signal transmitted from the calling station, a plurality of receiving means, each of which demodulates the radio signal from antenna and detects the strength of the radio signal and the code of the calling station, selecting means for selecting one of the plurality of receiving means based on a control signal, analog/digital (A/D) converting means for converting the strength of the radio signal which is analog signal received from the receiving means to a digital signal; and signal processing and controlling means for detecting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
  • an antenna system for receiving radio signal comprising a plurality of antenna for receiving the radio signal transmitted from the calling station, receiving means for demodulating the radio signal and for detecting the strength of the radio signal and the code of the calling station, switching means for switching the radio signal from the plurality of antenna to the receiving means based on a control signal, analog/digital (A/D) converting means for converting the strength of the radio signal which is analog signal to a digital signal, and signal processing and controlling means for detecting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
  • a method for receiving radio signal used for an antenna system comprising the steps of demodulating the radio signal and detecting the strength of the radio signal and the code of the calling station when the radio signal transmitted from the calling station is received at the a plurality of antenna, converting the strength of the radio signal which is analog signal to a digital signal and detecting the strength of the radio signal, and detecting and transmitting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
  • FIG. 1 is a block diagram illustrating a calling location detector of radio signal in accordance with the present invention
  • Fig 2 is a diagram illustrating principle of calling location detector in accordance with one embodiment of the present invention
  • Fig 3 is a block diagram of antenna system for receipt of short pulse in accordance with one embodiment of the present invention
  • Fig 4 is a block diagram of antenna system for receipt of short pulse in accordance with another embodiment of the present invention
  • Fig 5 is a flow chart illustrating a method for detecting calling location of radio signal in accordance with one embodiment of the present invention
  • Fig 6 is a diagram illustrating gain according to central angles of antenna, which is used for obtaining receiving angle of radio signal
  • Fig 7 is a flow chart illustrating a method for detecting calling location of radio signal in accordance with another embodiment of the present invention.
  • Fig 8 is a flow chart illustrating a method for receiving short pulse at antenna system in accordance with further another embodiment of the present invention
  • FIG. 1 there is a block diagram of calling location detector of radio signal in accordance with one embodiment of the present invention which is suitable for simple topography such as level ground and mountains
  • a calling location detector of radio signal comprises a calling station 109, a plurality of antenna systems 101, 102, and 103 a plurality of antenna system monitoring parts 104, 105 and 106, a calling location detecting part of radio signal 107, and an output part of location and information of calling location 108
  • each antenna system 101, 102 and 103 comprises six antennae If the strength of the radio signal is larger than a threshold value, each antenna system detects the strength of radio signal received at each of antennae respectively Each antenna system 101, 102 and 103 respectively detects and outputs the code of calling station emitting the radio signal of which the strength is largest
  • Each antenna system monitoring part 104, 105 and 106 monitors the strength and the code of radio signal from each antenna system 101, 102 and 103 and outputs the state of the antenna system
  • the calling location detecting part 107 receives the strength and the code of calling station from antenna system monitoring parts 104, 105 and 106 and obtain receiving angle of radio signal received at each antenna system by using the difference among the strength of the radio
  • the output part of location and information of calling station 108 receives the location and the code of calling station from the calling location detecting part 107, retrieves database having information of the calling station using code of calling station and outputs the corresponding information of the calling station Also, the output part of location and information of calling station 108 represents the location of the calling station on a map
  • the strength and the code of the calling stations may be respectively transmitted from each antenna system 101, 102 and 103 to each antenna system monitoring part 104, 105 and 106 by using wire or wireless modem or common communication line
  • only one antenna system monitoring part may be used (not shown in figures), and the strength and code of the calling stations may be transmitted from antenna systems 101, 102 and 103 to the antenna system monitoring part by using wire or wireless multi-modem or common communication line
  • the number of antenna systems is three and the number of antenna of each antenna system is six, the number of antenna systems and antennae may vary according to the environment and service of application
  • a different calling location detecting part 107 is used.
  • the others are the same as the above-mentioned embodiment, accordingly the detailed description about the elements except the calling location detecting part 107 will be omitted.
  • neural network studies the relation between the strength of radio signal received at each antenna and the calling location of the radio signal.
  • the strength of radio signal is inputted to input an end of the neural network, and the calling location (coordinate) is inputted to an output end of the neural network, thereby obtaining weight function which indicates the relation between input and output.
  • the calling location detecting part 107 receives the strength and the code of the radio signal from the antenna system monitoring part 104, 105 and 106 and detects the calling location of the radio signal by inputting the strength of the radio signal to the studied neural network.
  • This embodiment is suitable for complicated topography such as metropolitan.
  • the antenna systems 101, 102 and 103 within a range capable of receiving the radio signal detect the location of the calling station when the receiving angle of the radio signal from the calling station 109 is the same with that of each others. That is, the relation between the distance of antenna systems and the receiving angle allows the location of the calling station to be found.
  • Fig. 3 shows a block diagram of an antenna system for receiving short pulse in accordance with one embodiment of the present invention.
  • Each antenna system comprises six antennae 301, an antenna switch 302, a receiver 303, an analog/digital (A/D) convener 304 and a signal processing and controlling part 305.
  • the receiver 303 demodulates the radio signal transmitted from the calling station 109 and received at the antennae 301 and detects the strength of the radio signal and the code of the calling station.
  • the antenna switch 302 receives and selectively switches six radio signals from the antennae 301 according to antenna selecting control signal (3bits) from the signal processing and controlling part 305
  • the A/D converter 304 receives from the receiver 303 converts the strength of radio signal in analog to digital
  • the signal processing and controlling part 305 detects and outputs the strength of six radio signals received through the receiver 303 and the A/D converter 304 and the code of the calling station through the receiver 303 At this time, the signal processing and controlling part 305 selects the radio signal having stronger strength than those of the others and outputs the code of the calling station corresponding to the radio signal
  • each antenna system 101, 102 and 103 transmits the information for antenna measurement (e g , strength of the radio signal, code of calling station, etc ) at every 1 3 seconds
  • Each antenna is arranged by 30 degree
  • the radio signal through one of the six antennae is inputted to the receiver 303
  • the receiver 303 outputs the strength of radio signal and the code of calling station 109
  • the antenna switch 302 is controlled by an antenna selecting control signal from the signal processing and controlling part 305
  • the signal processing and controlling part 305 receives the strength of the radio signal from one of six antennae through the receiver 303 and the A/D converter 304 If the strength of the radio signal is larger than a given value Vref, the signal processing and controlling part 305 determines that the signal is an emergency call, and then subsequently reads again and stores the strength of the signal from first antenna to sixth antenna and selects one signal of which the strength is largest Then, the signal processing and controlling part 305 reads the code of the calling station included in the selected signal When the strength of the radio signals of six antennae and the code of the calling station have been read, the signal processing and controlling part 305 transmits the information to the antenna system monitoring part 106 and the calling location detecting part 107 through serial
  • Fig 4 shows a block diagram of an antenna system for receiving short pulse in accordance with another embodiment of the present invention
  • Each antenna system comprises six antennae 401, six receivers 402, a switch 403. a multichannel analog/digital (A/D) converter 404 and a signal processing and controlling part 405
  • Each receiver 402 demodulates the radio signal transmitted from the calling station 109 and received at each antenna 401 and detects the strength of the radio signal and the code of the calling station
  • the antenna switch 403 receives and selectively switches six radio signals from the receivers 402 according to an antenna selecting control signal (3 bits) from the signal processing and controlling part 405
  • the multichannel A/D converter 404 receives from the receivers 402 converts the strength of radio signal in analog signal to digital signal
  • the signal processing and controlling part 405 detects and outputs the strength of six radio signals received through the receivers 402 and the A/D converter 404 and code of the calling station through the receiver 402 At this time, the signal processing and controlling part 405 selects the radio signal having stronger strength than that of the others and outputs the code of the calling station corresponding to the radio signal
  • each antenna system 101, 102 and 103 transmits the information for antenna measurement (e g , strength of the radio signal, code of calling station, etc.) at every 1.3 seconds
  • the calling station 109 generating such a short pulse (e g., 20 msec) allows the consumption of battery to be reduced by 20 to 100 times, thereby being configured as small
  • Fig 5 shows a flow chart illustrating a method for detecting calling location of radio signal in accordance with one embodiment of the present invention
  • the method in this embodiment is suitable for simple topography such as level ground and mountains
  • radio signal is received from the calling station 109 at three antenna systems 101 to 103, each antenna system having six antennae at step 501
  • the strength of the radio signal received at each antenna of antenna systems is respectively detected at step 502
  • One of the radio signals of which the strength is largest is selected and the code of the calling station is detected from the selected radio signal at step 503
  • the process monitors the strength of the radio signal and the code of the calling station and reports the state of antenna system to a system operator at step 504
  • the receiving angle of the radio signal is measured by using the difference among the strength of the six radio signals received at each antenna system at step 505, the calling location is detected from the relation between the receiving angles and the distance among three antenna systems 101 to 103 at step 506
  • Fig 6 is a diagram illustrating gain according to central angles of antenna, which is used for obtaining receiving angle of radio signal
  • l through a6 respectively denote central angle of six antennae and VI through V6 do gain curve of the antennae If the receiving direction of the radio signal is between al and a2, the radio signal has the maximum strength at antenna 1 or antenna 2 If the strength of the radio signal at the antenna 1 is larger than that at the antenna 2, the receiving angle increases toward al
  • Absolute value of the strength of the radio signal varies according to the distance and geographical environment between the antenna and the calling station. However, the strength of the radio signal does not vary according to the distance between the antenna and the calling station Accordingly, the receiving angle can be obtained using the strength of the radio signal. However, since the antenna has its characteristics, curves as shown in Fig 6 can be compensated using the equation 1 as following.
  • the estimation of the receiving angles can be performed using the difference in the strength of the radio signal received at adjacent antennae by compensating the receiving angles of antenna as mentioned above, an antenna by which the radio signal having largest strength Vn is received is selected.
  • the strength V _, and V n , of radio signals received by adjacent antennae are compared with each other If the strength V n ., is larger than the strength Vn+1, the receiving angle is between a n , and a réelle, the receiving
  • Fig 7 is a flow chart illustrating a method for detecting calling location of radio signal in accordance with another embodiment of the present invention
  • Calling stations located at each service area divided by a selected distance, for example. 50m respectively transmit radio signal
  • the strength of the radio signal transmitted from a location and received at each antenna system 101 to 103 is stored in
  • the radio signal is received from the calling station 109 at three antenna systems
  • each antenna system having six antennae at step 702.
  • the strength of the radio signal received at each antenna of antenna systems is respectively detected at step 703, the radio signal of which the strength is largest is selected and the code of the calling station is detected from the selected radio signal at step 704
  • the process monitors the strength of the radio signal and the code of the calling station and reports the state of antenna system to a system operator bv monitoring at step 705
  • the neural network receives the strength values of the radio signals detected in the three antenna systems and obtains and outputs the calling location of the radio signal based on the studied weight function at step 706
  • the process represents the detected location of calling station on map corresponding thereto and display information about subscriber by retrieving database storing the information about subscriber from the code of the calling station at step 707
  • the strength of the radio signal received at the antenna systems widely varies, thereby resulting in error of output location
  • mean value of a lot of the strength of the radio signal is inputted to the neural network
  • the method using the neural network as mentioned above is suitable for complicated topography such as metropolitan That is, this method is useful for detecting the calling location where wave environment is so complicated that it can not be used
  • the method using the receiving angle of the radio signal Configuration and operation of the above neural network is similar to those of a general neural network
  • the (eighteen) strength values of the received radio signal are provided to the input end of the neural network and (two) coordinates of the calling location are outputted at the output end
  • Fig 8 is a flow chart illustrating a method for receiving short pulse at antenna system in accordance with further another embodiment of the present invention
  • One of six receivers 402 is selected in response to (3b ⁇ ts) code selecting control signal at step 803
  • Analog strength of the radio signal and code of the calling station are converted to digital signals at step 805, and the digital strength of the radio signal is outputted at step 805
  • step 806 determining whether all receivers have been selected in serial If thev have been selected, one of radio signals of which the strength is largest is selected and the code of the calling station thereof is detected at step 808 The detected code of the calling station and six strength values of the radio signal are transmitted at step 809
  • the antenna system is embodied using the code selecting switch which selects one of six receivers respectively coupled to six receiving antennae
  • the antenna system detects 20 msec short radio pulses generated at every 1 3 seconds
  • the calling station 109 generating such a short pulse (e g , 20 msec) allows the consumption of battery to be reduced by 20 to 100 times thereby being configured as small
  • Sequential selection of six receiver by the code selecting switch allows noise generated in switching operation and receiving time to be reduced
  • the present invention can performs precise location detecting service in wide area Therefore, the method for detecting calling location of the present invention is used for emergency call service, finding a missing child, etc

Abstract

Apparatus and method for detecting calling location of radio signal using short pulses from a calling station. The apparatus for detecting calling location of radio signal, comprising: a plurality of antenna systems (101, 102 and 103), each antenna system having a plurality of antennae, for detecting strength of the radio signal and code of calling station (109) if the radio signal of which the strength is larger than a threshold is received; calling location detecting means (107) for detecting the calling location of radio signal based on relation between distances between the antenna systems and receiving angles, after obtaining the receiving angles of the radio signal received at each the antenna system using difference of the radio signal received at a plurality of the antennae and detected; and output means (108) for receiving the calling location of radio signal and the code of the calling station, and for outputting information of the calling station by retrieving subscriber database based on the code of the calling station and the calling location.

Description

APPARATUS AND METHOD FOR DETECTING CALLING LOCATION OF RADIO SIGNAL USING SHORT PULSE
Description Technical. Field
The present invention relates in general to an apparatus and a method for detecting calling location of radio signal using short pulse from a calling station
Background Art There are some methods for detecting calling location of radio signal
One technique is a method for detecting the direction of calling signal using width of antenna beam of a conventional directional antenna, wherein an angle detector detects the direction of calling signal when the calling signal is detected by the rotation of the directional antenna. In this case, there is a problem that the precision of angle detection decreases even in case where antenna beam is wide Also, there are some difficulties in precise detection of wide area because of the limited precision of angle detection
Another is mono pulse measuring method that predicts direction of calling signal using two or more than receiving antenna. Using the mono pulse measuring method, it is possible to obtain preciser angle information than the method using width of antenna beam However, since mono pulse measuring method has been developed for military technology, facility for implementing mono pulse measuring method costs much and commercial application of parts is not enough to provide commercial service
Still another is a method using radar. In this case, a signal is emitted from radar, received at a portable calling system and re-emitted from the portable calling system, thereby measuring location of portable calling system using the delay of signal The method has problems that the system for implementing the method costs much and the mixture of signals can happen due to multiple reflection of signal
Disclosure of Invention It is, therefore, an object of the present invention is to provide an antenna system and a method for detecting strength of radio signal and code information of a calling station from the radio signal received at a given number of antenna systems, the radio signal being short pulse
Another object of the present invention is to provide an apparatus and a method for detecting location of calling station by using strength of radio signal and code information of a calling station detected from the radio signal received at a given number of antenna systems, the radio signal being short pulse
In accordance with one aspect of the present invention, there is provided an apparatus for detecting calling location of radio signal, the apparatus comprising a plurality of antenna systems, each antenna system having a plurality of antennae, for detecting strength of the radio signal and code of calling station if the radio signal of which the strength is larger than a threshold is received, calling location detecting means for detecting the calling location of radio signal based on relation between distances between the antenna systems and receiving angles, after obtaining the receiving angles of the radio signal received at each the antenna system using difference of the radio signal received at a plurality of the antennae and detected, and output means for receiving the calling location of radio signal and the code of the calling station, and for outputting information of the calling station by retrieving subscriber database based on the code of the calling station and the calling location In accordance with another aspect of present invention, there is provided an apparatus for detecting calling location of radio signal, the apparatus comprising a plurality of antenna systems, each antenna system having a plurality of antennae, for detecting strength of the radio signal and code of calling station if the radio signal of which the strength is larger than a threshold is received, calling location detecting means having neural network which is pre-studied for detecting the calling location of radio signal based on the strength of the radio signal provided to the neural network, the neural network receiving the strength of the radio signal at an input node thereof and calling location of the radio signal at an output node thereof, and output means for receiving the calling location of radio signal and the code of the calling station, and for outputting information of the calling station by retπeving subscriber database based on the code of the calling station and the calling location
In accordance with further another aspect of present invention there is provided a method for detecting calling location of radio signal in an apparatus for detecting calling location of radio signal, the method comprising the steps of detecting strength of the radio signal received by a plurality of antennae and code of a calling station at each of antenna system if the radio signal transmitted from the calling station is received measuring receiving angles of the radio signal received at each the antenna system using difference of the radio signal received at a plurality of the antennae in each of the antenna system, detecting the calling location of radio signal based on relation between distances between the antenna svstems and the receiving angles, and displaying the calling location of the radio signal and information of the calling station by retrieving map database and subscriber database based on the code of the calling station and the calling location
In accordance with still another aspect of present invention, there is provided a method for detecting calling location of radio signal in an apparatus for detecting calling location of radio signal, the method comprising the steps of allowing a neural network to study relation between input and output thereof by operating the calling station at a location, the input being strength of the radio signal received by each of a plurality of antennae in each antenna system, the output being calling location of the radio signal; detecting strength of the radio signal received by the plurality of antennae and code of a calling station at each of antenna system if the radio signal transmitted from the calling station is received, detecting the calling location by inputting the strength of the radio signal detected at each of the antenna in each the antenna system to the neural network, and displaying the calling location of the radio signal and information of the calling station by retrieving map database and subscriber database based on the code of the calling station and the calling location
In accordance with still another aspect of present invention, there is provided an antenna system for receiving radio signal, comprising a plurality of antennae for receiving the radio signal transmitted from the calling station, a plurality of receiving means, each of which demodulates the radio signal from antenna and detects the strength of the radio signal and the code of the calling station, selecting means for selecting one of the plurality of receiving means based on a control signal, analog/digital (A/D) converting means for converting the strength of the radio signal which is analog signal received from the receiving means to a digital signal; and signal processing and controlling means for detecting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
In accordance with still another aspect of present invention, there is provided an antenna system for receiving radio signal, comprising a plurality of antenna for receiving the radio signal transmitted from the calling station, receiving means for demodulating the radio signal and for detecting the strength of the radio signal and the code of the calling station, switching means for switching the radio signal from the plurality of antenna to the receiving means based on a control signal, analog/digital (A/D) converting means for converting the strength of the radio signal which is analog signal to a digital signal, and signal processing and controlling means for detecting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
In accordance with still another aspect of present invention, there is provided a method for receiving radio signal used for an antenna system, comprising the steps of demodulating the radio signal and detecting the strength of the radio signal and the code of the calling station when the radio signal transmitted from the calling station is received at the a plurality of antenna, converting the strength of the radio signal which is analog signal to a digital signal and detecting the strength of the radio signal, and detecting and transmitting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
Brief Description of Drawings
The above and other objects and features of the present invention will become apparent from the following description of preferred embodiments given in conjunction with the accompanying drawings, in which Fig 1 is a block diagram illustrating a calling location detector of radio signal in accordance with the present invention,
Fig 2 is a diagram illustrating principle of calling location detector in accordance with one embodiment of the present invention,
Fig 3 is a block diagram of antenna system for receipt of short pulse in accordance with one embodiment of the present invention, Fig 4 is a block diagram of antenna system for receipt of short pulse in accordance with another embodiment of the present invention
Fig 5 is a flow chart illustrating a method for detecting calling location of radio signal in accordance with one embodiment of the present invention, Fig 6 is a diagram illustrating gain according to central angles of antenna, which is used for obtaining receiving angle of radio signal,
Fig 7 is a flow chart illustrating a method for detecting calling location of radio signal in accordance with another embodiment of the present invention, and
Fig 8 is a flow chart illustrating a method for receiving short pulse at antenna system in accordance with further another embodiment of the present invention
Best Mode for Carrying out the Invention
Referring to Fig 1, there is a block diagram of calling location detector of radio signal in accordance with one embodiment of the present invention which is suitable for simple topography such as level ground and mountains
A calling location detector of radio signal comprises a calling station 109, a plurality of antenna systems 101, 102, and 103 a plurality of antenna system monitoring parts 104, 105 and 106, a calling location detecting part of radio signal 107, and an output part of location and information of calling location 108 In this embodiment, each antenna system 101, 102 and 103 comprises six antennae If the strength of the radio signal is larger than a threshold value, each antenna system detects the strength of radio signal received at each of antennae respectively Each antenna system 101, 102 and 103 respectively detects and outputs the code of calling station emitting the radio signal of which the strength is largest Each antenna system monitoring part 104, 105 and 106 monitors the strength and the code of radio signal from each antenna system 101, 102 and 103 and outputs the state of the antenna system The calling location detecting part 107 receives the strength and the code of calling station from antenna system monitoring parts 104, 105 and 106 and obtain receiving angle of radio signal received at each antenna system by using the difference among the strength of the radio signals. Then the calling location detecting part 107 detects calling location of the radio signal by using the receiving angle and distance among the antenna systems 101, 102 and 103
The output part of location and information of calling station 108 receives the location and the code of calling station from the calling location detecting part 107, retrieves database having information of the calling station using code of calling station and outputs the corresponding information of the calling station Also, the output part of location and information of calling station 108 represents the location of the calling station on a map
The strength and the code of the calling stations may be respectively transmitted from each antenna system 101, 102 and 103 to each antenna system monitoring part 104, 105 and 106 by using wire or wireless modem or common communication line
In another embodiment, only one antenna system monitoring part may be used (not shown in figures), and the strength and code of the calling stations may be transmitted from antenna systems 101, 102 and 103 to the antenna system monitoring part by using wire or wireless multi-modem or common communication line
In this embodiment, though the number of antenna systems is three and the number of antenna of each antenna system is six, the number of antenna systems and antennae may vary according to the environment and service of application
In another embodiment, a different calling location detecting part 107 is used. The others are the same as the above-mentioned embodiment, accordingly the detailed description about the elements except the calling location detecting part 107 will be omitted.
For implementing this embodiment, neural network studies the relation between the strength of radio signal received at each antenna and the calling location of the radio signal. The strength of radio signal is inputted to input an end of the neural network, and the calling location (coordinate) is inputted to an output end of the neural network, thereby obtaining weight function which indicates the relation between input and output.
The calling location detecting part 107 receives the strength and the code of the radio signal from the antenna system monitoring part 104, 105 and 106 and detects the calling location of the radio signal by inputting the strength of the radio signal to the studied neural network. This embodiment is suitable for complicated topography such as metropolitan.
Referring Fig. 2, the operation of the calling location detecting part 107 is illustrated.
The antenna systems 101, 102 and 103 within a range capable of receiving the radio signal detect the location of the calling station when the receiving angle of the radio signal from the calling station 109 is the same with that of each others. That is, the relation between the distance of antenna systems and the receiving angle allows the location of the calling station to be found.
Fig. 3 shows a block diagram of an antenna system for receiving short pulse in accordance with one embodiment of the present invention.
Each antenna system comprises six antennae 301, an antenna switch 302, a receiver 303, an analog/digital (A/D) convener 304 and a signal processing and controlling part 305. The receiver 303 demodulates the radio signal transmitted from the calling station 109 and received at the antennae 301 and detects the strength of the radio signal and the code of the calling station The antenna switch 302 receives and selectively switches six radio signals from the antennae 301 according to antenna selecting control signal (3bits) from the signal processing and controlling part 305 The A/D converter 304 receives from the receiver 303 converts the strength of radio signal in analog to digital The signal processing and controlling part 305 detects and outputs the strength of six radio signals received through the receiver 303 and the A/D converter 304 and the code of the calling station through the receiver 303 At this time, the signal processing and controlling part 305 selects the radio signal having stronger strength than those of the others and outputs the code of the calling station corresponding to the radio signal
If the calling station generates a short radio signal of which the length is 3 through 100 msec, preferably 65 msec, at every 0 7 through 2 seconds, preferably 1 3 seconds, each antenna system 101, 102 and 103 transmits the information for antenna measurement (e g , strength of the radio signal, code of calling station, etc ) at every 1 3 seconds
Each antenna is arranged by 30 degree The radio signal through one of the six antennae is inputted to the receiver 303 The receiver 303 outputs the strength of radio signal and the code of calling station 109 The antenna switch 302 is controlled by an antenna selecting control signal from the signal processing and controlling part 305 The signal processing and controlling part 305 receives the strength of the radio signal from one of six antennae through the receiver 303 and the A/D converter 304 If the strength of the radio signal is larger than a given value Vref, the signal processing and controlling part 305 determines that the signal is an emergency call, and then subsequently reads again and stores the strength of the signal from first antenna to sixth antenna and selects one signal of which the strength is largest Then, the signal processing and controlling part 305 reads the code of the calling station included in the selected signal When the strength of the radio signals of six antennae and the code of the calling station have been read, the signal processing and controlling part 305 transmits the information to the antenna system monitoring part 106 and the calling location detecting part 107 through serial port and wire or wireless modem
Fig 4 shows a block diagram of an antenna system for receiving short pulse in accordance with another embodiment of the present invention
Each antenna system comprises six antennae 401, six receivers 402, a switch 403. a multichannel analog/digital (A/D) converter 404 and a signal processing and controlling part 405
Each receiver 402 demodulates the radio signal transmitted from the calling station 109 and received at each antenna 401 and detects the strength of the radio signal and the code of the calling station The antenna switch 403 receives and selectively switches six radio signals from the receivers 402 according to an antenna selecting control signal (3 bits) from the signal processing and controlling part 405 The multichannel A/D converter 404 receives from the receivers 402 converts the strength of radio signal in analog signal to digital signal The signal processing and controlling part 405 detects and outputs the strength of six radio signals received through the receivers 402 and the A/D converter 404 and code of the calling station through the receiver 402 At this time, the signal processing and controlling part 405 selects the radio signal having stronger strength than that of the others and outputs the code of the calling station corresponding to the radio signal
If the calling station generates a short radio signal, the length of which is 3 through 60 msec, preferably 20 msec, at every 0 7 through 2 seconds, preferably 1.3 seconds, each antenna system 101, 102 and 103 transmits the information for antenna measurement (e g , strength of the radio signal, code of calling station, etc.) at every 1.3 seconds The calling station 109 generating such a short pulse (e g., 20 msec) allows the consumption of battery to be reduced by 20 to 100 times, thereby being configured as small
Fig 5 shows a flow chart illustrating a method for detecting calling location of radio signal in accordance with one embodiment of the present invention The method in this embodiment is suitable for simple topography such as level ground and mountains First, radio signal is received from the calling station 109 at three antenna systems 101 to 103, each antenna system having six antennae at step 501 The strength of the radio signal received at each antenna of antenna systems is respectively detected at step 502 One of the radio signals of which the strength is largest is selected and the code of the calling station is detected from the selected radio signal at step 503 The process monitors the strength of the radio signal and the code of the calling station and reports the state of antenna system to a system operator at step 504
The receiving angle of the radio signal is measured by using the difference among the strength of the six radio signals received at each antenna system at step 505, the calling location is detected from the relation between the receiving angles and the distance among three antenna systems 101 to 103 at step 506
Then, the process represents the detected location of calling station on map corresponding thereto, and displays information about subscriber from the code of the calling station by retrieving database storing the information about subscriber at step 507 Fig 6 is a diagram illustrating gain according to central angles of antenna, which is used for obtaining receiving angle of radio signal
First, operations for compensating receiving angles of antenna will be described In this figure, l through a6 respectively denote central angle of six antennae and VI through V6 do gain curve of the antennae If the receiving direction of the radio signal is between al and a2, the radio signal has the maximum strength at antenna 1 or antenna 2 If the strength of the radio signal at the antenna 1 is larger than that at the antenna 2, the receiving angle increases toward al
Absolute value of the strength of the radio signal varies according to the distance and geographical environment between the antenna and the calling station. However, the strength of the radio signal does not vary according to the distance between the antenna and the calling station Accordingly, the receiving angle can be obtained using the strength of the radio signal However, since the antenna has its characteristics, curves as shown in Fig 6 can be compensated using the equation 1 as following.
-. τ\ = a n l n(Vn ι - Vn)+β n.l n
Z T2 = α n, n(Vn , - Vn)+β n.l n (1)
If the difference in the measured strength of the radio signal is applied to the equation (1) when the receiving angles Tl and T2 between antennae n-1 and n are
known, values of α _._, n, β n l n can be obtained. If the curve is obtained, angle of the
received radio signal which is an angle between antenna n- 1 and antenna n can be
obtained by computation Errors in the values of α n.l n and β n l n can be reduced by
mean value obtained from a lot of experiments
Next, operations for obtaining receiving angles of the radio signal will be described
If the estimation of the receiving angles can be performed using the difference in the strength of the radio signal received at adjacent antennae by compensating the receiving angles of antenna as mentioned above, an antenna by which the radio signal having largest strength Vn is received is selected The strength V _, and Vn , of radio signals received by adjacent antennae are compared with each other If the strength Vn., is larger than the strength Vn+1, the receiving angle is between an , and a„, the receiving
angle α „., n(Vn , - Vn)+β „., n is obtained from Vn ,-Vn
Fig 7 is a flow chart illustrating a method for detecting calling location of radio signal in accordance with another embodiment of the present invention
Calling stations located at each service area divided by a selected distance, for example. 50m respectively transmit radio signal The strength of the radio signal transmitted from a location and received at each antenna system 101 to 103 is stored in
a memory Eighteen strength values of the radio signal (six antennae x three antenna
system) for one location are stored Neural network studies the relation between the measured strength of the radio signal and the location of calling station at step 701 At this time, the neural network obtains weight function indicating the relation between input and output by inputting the measured strength values of the radio signal to input node of the neural network and the location of the calling station (coordinate) to its output node If strength values of the radio signal at each antenna are inputted to the neural network when a calling station generates the radio signal at a certain location, the location of calling station is obtained based on the result of study
The radio signal is received from the calling station 109 at three antenna systems
101 to 103, each antenna system having six antennae at step 702. The strength of the radio signal received at each antenna of antenna systems is respectively detected at step 703, the radio signal of which the strength is largest is selected and the code of the calling station is detected from the selected radio signal at step 704 The process monitors the strength of the radio signal and the code of the calling station and reports the state of antenna system to a system operator bv monitoring at step 705 The neural network receives the strength values of the radio signals detected in the three antenna systems and obtains and outputs the calling location of the radio signal based on the studied weight function at step 706
Then, the process represents the detected location of calling station on map corresponding thereto and display information about subscriber by retrieving database storing the information about subscriber from the code of the calling station at step 707 When the calling station generating and transmitting radio signal moves, the strength of the radio signal received at the antenna systems widely varies, thereby resulting in error of output location To reduce this shortage, in the present invention, mean value of a lot of the strength of the radio signal is inputted to the neural network The method using the neural network as mentioned above is suitable for complicated topography such as metropolitan That is, this method is useful for detecting the calling location where wave environment is so complicated that it can not be used the method using the receiving angle of the radio signal Configuration and operation of the above neural network is similar to those of a general neural network The (eighteen) strength values of the received radio signal are provided to the input end of the neural network and (two) coordinates of the calling location are outputted at the output end
Fig 8 is a flow chart illustrating a method for receiving short pulse at antenna system in accordance with further another embodiment of the present invention First, if the radio signal transmitted from the calling station 109 are received by six receiving antennae at step 801, the radio signal received at each of six antennae is demodulated in each of six receiver 402 and the strength of the radio signal and code of the calling station are respectively detected at step 802
One of six receivers 402 is selected in response to (3bιts) code selecting control signal at step 803 Analog strength of the radio signal and code of the calling station are converted to digital signals at step 805, and the digital strength of the radio signal is outputted at step 805
Then, the process continues at step 806 determining whether all receivers have been selected in serial If thev have been selected, one of radio signals of which the strength is largest is selected and the code of the calling station thereof is detected at step 808 The detected code of the calling station and six strength values of the radio signal are transmitted at step 809
In the present invention, the antenna system is embodied using the code selecting switch which selects one of six receivers respectively coupled to six receiving antennae The antenna system detects 20 msec short radio pulses generated at every 1 3 seconds The calling station 109 generating such a short pulse (e g , 20 msec) allows the consumption of battery to be reduced by 20 to 100 times thereby being configured as small
Sequential selection of six receiver by the code selecting switch allows noise generated in switching operation and receiving time to be reduced
The present invention can performs precise location detecting service in wide area Therefore, the method for detecting calling location of the present invention is used for emergency call service, finding a missing child, etc
Although the preferred embodiments of the invention have been disclosed for illustrative purpose those skilled in the art will appreciate that various modification, addition and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in accompanying claims.

Claims

Claims
1 An apparatus for detecting a calling location of a radio signal, the apparatus comprising a plurality of antenna systems, each antenna system having a plurality of antennae, for detecting strength of the radio signal and a code of the calling station if the radio signal of which the strength is larger than a threshold is received, calling location detecting means for detecting the calling location of radio signal based on relation between distances between said antenna systems and receiving angles, after obtaining the receiving angles of the radio signal received at each said antenna system using difference of the radio signal received at a plurality of said antennae and detected, and output means for receiving the calling location of radio signal and the code of the calling station, and for outputting information of the calling station by retrieving subscriber database based on the code of the calling station and the calling location.
2 The apparatus as claimed in claim 1, further comprising a plurality of monitoring means for respectively outputting state of said plurality of antenna system by monitoring the strength of the radio signal and the code of the calling station
3 The apparatus as claimed in claim 2, wherein the number of said monitoring means is the same with that of said antenna system, and wherein each of said antenna system communicates the strength of the radio signal and the code of the calling station with each of said monitoring means through modem or communication line.
4 The apparatus as claimed in claim 2, wherein said monitoring means receives the strength of the radio signal and the code of the calling station transmitted from said plurality of antenna systems through multi-modem and outputs state of said antenna
systems
5 The apparatus as claimed in claim 1 , wherein each of said antenna system
comprises a plurality of antenna for receiving the radio signal transmitted from the calling station, receiving means for demodulating the radio signal and for detecting the strength
of the radio signal and the code of the calling station, switching means for switching the radio signal from said plurality of antenna to said receiving means based on a control signal, analog/digital (A D) converting means for converting the strength of the radio signal which is analog signal to a digital signal, and signal processing and controlling means for detecting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
6 The apparatus as claimed in claim 5, wherein said signal processing and controlling means detects and transmits a plurality of the radio signals received through said receiving means and said A/D converting means based on the control signal and the code of the calling station
7 The apparatus as claimed in claim 6, wherein said signal processing and controlling means selects one of the radio signals of which strength is largest and detects code of the calling station included in the selected radio signal
8 The apparatus as claimed in claim 5, wherein said switching means consecutively selects one of said plurality of antennae based on the control signal from said signal processing and controlling means
9 The apparatus as claimed in claim 1 , wherein said antenna system comprises' a plurality of antennae for receiving the radio signal transmitted from the calling station,
a plurality of receiving means, each of which demodulates the radio signal from antenna and detects the strength of the radio signal and the code of the calling station, selecting means for selecting one of said plurality of receiving means based on a control signal, analog/digital (A/D) converting means for converting the strength of the radio signal which is analog signal received from said receiving means to a digital signal; and signal processing and controlling means for detecting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
10 The apparatus as claimed in claim 9, wherein said signal processing and controlling means detects and transmits a plurality of the radio signals received through said receiving means and said A/D converting means based on the control signal and the code of the calling station
11 The apparatus as claimed in claim 10, wherein said signal processing and controlling means selects one of the radio signals of which strength is largest and detects code of the calling station included in the selected radio signal
12 The apparatus as claimed in claim 9, wherein said selecting means consecutively selects one of said plurality of receiving antennae based on the control signal from said signal processing and controlling means
13 An apparatus for detecting calling location of radio signal, the apparatus comprising a plurality of antenna systems, each antenna system having a plurality of antennae, for detecting strength of the radio signal and code of calling station if the radio signal of which the strength is larger than a threshold is received, calling location detecting means having neural network which is pre-studied, for detecting the calling location of radio signal based on the strength of the radio signal provided to the neural network, the neural network receiving the strength of the radio signal at an input node thereof and calling location of the radio signal at an output node thereof, and output means for receiving the calling location of radio signal and the code of the calling station, and for outputting information of the calling station by retπeving subscriber database based on the code of the calling station and the calling location
14 The apparatus as claimed in claim 13, further comprising a plurality of monitoring means for respectively outputting state of said plurality of antenna system by monitoring the strength of the radio signal and the code of the calling station
15 The apparatus as claimed in claim 14, wherein the number of said monitoring means is the same with that of said antenna system, and wherein each of said antenna system communicates the strength of the radio signal and the code of the calling station with each of said monitoring means through modem or communication line
16 The apparatus as claimed in claim 14, wherein said monitoring means receives the strength of the radio signal and the code of the calling station transmitted from said plurality of antenna systems through multi-modem and outputs state of said antenna systems
17 The apparatus as claimed in claim 13, wherein each of said antenna system comprises a plurality of antennae for receiving the radio signal transmitted from the calling station, receiving means for demodulating the radio signal and for detecting the strength of the radio signal and the code of the calling station, switching means for switching the radio signal from said plurality of antenna to said receiving means based on a control signal, analog digital (A/D) converting means for converting the strength of the radio signal which is analog signal to a digital signal; and signal processing and controlling means for detecting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
18 The apparatus as claimed in claim 17, wherein said signal processing and controlling means detects and transmits a plurality of the radio signals received through said receiving means and said A/D converting means based on the control signal and the code of the calling station
19 The apparatus as claimed in claim 18, wherein said signal processing and controlling means selects one of the radio signals of which strength is largest and detects code of the calling station included in the selected radio signal
20 The apparatus as claimed in claim 17, wherein said switching means consecutively selects one of said plurality of antennae based on the control signal from said signal processing and controlling means
21 The apparatus as claimed in claim 13, wherein said antenna system compπses a plurality of antennae for receiving the radio signal transmitted from the calling station,
a plurality of receiving means, each of which demodulates the radio signal from antenna and detects the strength of the radio signal and the code of the calling station, selecting means for selecting one of said plurality of receiving means based on a control signal,
analog/digital (A/D) converting means for converting the strength of the radio signal which is analog signal received from said receiving means to a digital signal, and signal processing and controlling means for detecting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
22 The apparatus as claimed in claim 21, wherein said signal processing and controlling means detects and transmits a plurality of the radio signals received through said receiving means and said A D converting means based on the control signal and the code of the calling station
23 The apparatus as claimed in claim 22, wherein said signal processing and controlling means selects one of the radio signals of which strength is largest and detects code of the calling station included in the selected radio signal
24 The apparatus as claimed in claim 21, wherein said selecting means consecutively selects one of said plurality of receiving antennae based on the control signal from said signal processing and controlling means
25 A method for detecting calling location of radio signal in an apparatus for detecting calling location of radio signal, said method comprising the steps of detecting strength of the radio signal received by a plurality of antennae and code of a calling station at each of antenna svstem if the radio signal transmitted from the calling station is received, measuring receiving angles of the radio signal received at each said antenna system using difference of the radio signal received at a plurality of said antennae in each of the antenna system, detecting the calling location of radio signal based on relation between distances between said antenna svstems and the receiving angles, and displaying the calling location of the radio signal and information of the calling station by retrieving map database and subscriber database based on the code of the calling station and the calling location
26 The method as claimed in claim 25, further comprising the step of respectively outputting state of said plurality of antenna system by monitoring the strength of the radio signal and the code of the calling station
27 The method as claimed in claim 25, wherein the step of detecting further comprises the steps of demodulating the radio signal and detecting the strength of the radio signal and the code of the calling station when the radio signal transmitted from the calling station is received at said a plurality of antenna, converting the strength of the radio signal which is analog signal to a digital signal and detecting the strength of the radio signal, and detecting and transmitting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
28 A method for detecting calling location of radio signal in an apparatus for detecting calling location of radio signal, said method comprising the steps of allowing a neural network to study relation between input and output thereof by operating the calling station at a location, the input being strength of the radio signal received by each of a plurality of antennae in each antenna system, the output being calling location of the radio signal, detecting strength of the radio signal received by said a plurality of antennae and code of a calling station at each of antenna system if the radio signal transmitted from the calling station is received, detecting the calling location by inputting the strength of the radio signal detected at each of said antenna in each said antenna system to the neural network, and displaying the calling location of the radio signal and information of the calling station by retrieving map database and subscriber database based on the code of the calling station and the calling location
29 The method as claimed in claim 28, further comprising the step of respectively outputting state of said plurality of antenna system by monitoring the strength of the radio signal and the code of the calling station
30 The method as claimed in claim 28, wherein the step of detecting further comprises the steps of demodulating the radio signal and detecting the strength of the radio signal and the code of the calling station when the radio signal transmitted from the calling station is received at said a plurality of antenna, converting the strength of the radio signal which is analog signal to a digital signal and detecting the strength of the radio signal, and detecting and transmitting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
31 An antenna system for receiving radio signal, comprising a plurality of antennae for receiving the radio signal transmitted from the calling station, a plurality of receiving means, each of which demodulates the radio signal from antenna and detects the strength of the radio signal and the code of the calling station, selecting means for selecting one of said plurality of receiving means based on a control signal, analog/digital (A/D) converting means for converting the strength of the radio signal which is analog signal received from said receiving means to a digital signal, and signal processing and controlling means for detecting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
32 The antenna system as claimed in claim 31. wherein said signal processing and controlling means detects and transmits a plurality of the radio signals received through said receiving means and said A/D converting means based on the control signal and the code of the calling station
33 The antenna system as claimed in claim 32, wherein said signal processing and controlling means selects one of the radio signals of which strength is largest and detects code of the calling station included in the selected radio signal
34 The antenna system as claimed in claim 31, wherein said selecting means consecutively selects one of said plurality of receiving antennae based on the control signal from said signal processing and controlling means.
35 An antenna system for receiving radio signal, comprising a plurality of antenna for receiving the radio signal transmitted from the calling station, receiving means for demodulating the radio signal and for detecting the strength of the radio signal and the code of the calling station, switching means for switching the radio signal from said plurality of antenna to said receiving means based on a control signal. analog/digital (A/D) converting means for converting the strength of the radio signal which is analog signal to a digital signal, and signal processing and controlling means for detecting a plurality of the strength of the radio signal and the code of the calling station based on the control signal
36. The antenna system as claimed in claim 35, wherein said signal processing and controlling means detects and transmits a plurality of the radio signals received through said receiving means and said A/D converting means based on the control signal and the code of the calling station
37 The antenna system as claimed in claim 36. wherein said signal processing and controlling means selects one of the radio signals of which strength is largest and detects code of the calling station included in the selected radio signal
38 The antenna system as claimed in claim 35. wherein said selecting means consecutively selects one of said plurality of receiving antennae based on the control signal from said signal processing and controlling means
39. A method for receiving radio signal used for an antenna system, comprising the steps of demodulating the radio signal and detecting the strength of the radio signal and the code of the calling station when the radio signal transmitted from the calling station is received at said a plurality of antenna, converting the strength of the radio signal which is analog signal to a digital signal and detecting the strength of the radio signal; and detecting and transmitting a plurality of the strength of the radio signal and the code of the calling station based on the control signal.
PCT/KR1999/000279 1998-06-09 1999-06-07 Apparatus and method for detecting calling location of radio signal using short pulse WO1999065251A2 (en)

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