WO2006054858A1 - Location share system using gps-handie talkie and, wireless and wired repeater - Google Patents

Location share system using gps-handie talkie and, wireless and wired repeater Download PDF

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Publication number
WO2006054858A1
WO2006054858A1 PCT/KR2005/003875 KR2005003875W WO2006054858A1 WO 2006054858 A1 WO2006054858 A1 WO 2006054858A1 KR 2005003875 W KR2005003875 W KR 2005003875W WO 2006054858 A1 WO2006054858 A1 WO 2006054858A1
Authority
WO
WIPO (PCT)
Prior art keywords
location
location information
gps
channel
radios
Prior art date
Application number
PCT/KR2005/003875
Other languages
French (fr)
Inventor
Gi Man Cha
Original Assignee
Plustec Co., Ltd.
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 Plustec Co., Ltd. filed Critical Plustec Co., Ltd.
Publication of WO2006054858A1 publication Critical patent/WO2006054858A1/en

Links

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
    • G01S5/02—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
    • G01S5/0284—Relative positioning
    • G01S5/0289—Relative positioning of multiple transceivers, e.g. in ad hoc networks
    • 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
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/14—Receivers specially adapted for specific applications
    • G01S19/17—Emergency applications
    • 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
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
    • 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
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
    • 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
    • G01S5/0072—Transmission between mobile stations, e.g. anti-collision systems

Definitions

  • the present invention relates to a multilateral location share system and, more par ⁇ ticularly, to a multilateral location share system in which location information and location change information of other subscribers belonging to the same group are displayed on its GPS radio when location change of other subscribers happens.
  • GPS global positioning system
  • C/A Coarse Acquisition
  • GPS terminals communicate with four or more GPS satellites anywhere on the earth.
  • a location coordinate value using the GPS system is obtained by measuring a distance of from the GPS satellite to the GPS terminal using a triangulation principle which uses the GPS satellite as a reference point. That is, a distance between the GPS satellite and the GPS terminal can be obtained by multiplying a time taken until the GPS terminal receives the signal transmitted from the GPS satellite by light velocity. At this time, a time difference between a time of when the GPS satellite transmits the signal and a time of when the GPS terminal receives the signal should be accurately considered.
  • the GPS satellite contains an extremely precise atomic clock using vibration of an atom therein
  • the GPS terminal contains an appropriately accurate clock instead of the high-priced atomic clock
  • a time difference between the atomic clock of the GPS satellite and the clock of the GPS terminal is corrected for synchronization there between.
  • Three GPS satellites are needed to calculate a location, and four GPS satellites are needed to calculate an altitude as well as a location.
  • the GPS system comprises a satellite portion, a territory controller portion, and a user to receive information transmitted from the GPS satellite to measure a location of a stationary or moving object on the ground, on the sea, and in the air, i.e., anywhere on the earth.
  • a location measurement in the conventional GPS system is as follows. [6] The GPS satellite periodically transmits the C/A code under control of the territory controller, and the GPS terminal receives the C/A code transmitted from the GPS satellite and measures its location based on the received C/A code. Then, the GPS terminal indicates the measured location on an electronic map so that the user can be aware of his/her location.
  • the conventional location tracking system using the GPS system provides a function for checking its current location, but it does not provide information of other subscribers belonging to a certain group.
  • the radio provides a function for exchanging information by in ⁇ terchanging a voice signal between two subscribers over a prescribed frequency.
  • the radio is widely used by people such as the police who patrol an area or building, firefighters who are thrown into to put out fires, labors who work at a remote distance in a building site to communicate with colleagues or a control room.
  • FIG. 1 is a schematic diagram illustrating a multilateral location share system according to an embodiment of the present invention
  • FIG. 2 is a block diagram illustrating a configuration of a GPS radio according to the present invention.
  • FIG. 3 is a block diagram illustrating a configuration of a wireless/wire location share repeater
  • FIG. 4 shows a location share screen according to an embodiment of the present invention
  • FIG. 5 shows a channel allocation in the multilateral location share system according to the present invention
  • FIG. 6 is a flowchart illustrating a process for selecting a transmitting channel in the multilateral location share system according to the present invention.
  • FIG. 7 shows that the multilateral location share system of the present invention is applied to a police system by way of example. Best Mode for Carrying Out the Invention
  • One aspect of the present invention is to provide a multilateral location share system, comprising: a plurality of GPS radios, each of which includes: a GPS receiver receiving a satellite signal containing its location information transmitted from a satellite; a channel selector connected to the GPS receiver to scan a plurality of transmitting channels set to be used to transmit the location information between the plurality of GPS radios to detect an idle channel and selecting an idle channel as a transmitting channel; a microphone receiving a voice signal from an external portion; a transmitter connected to the GPS receiver, the channel selector and the microphone to transmit the location information outputted from the GPS receiver over the transmitting channel detected by the channel selector and the voice signal inputted through the microphone over a first common channel set to be used to transmit the voice information among the plurality of GPS radios; a receiver detecting a channel of a signal received over the transmitting channel and outputting the channel information to the channel selector, amplifying and outputting the voice information received over the first common channel to the speaker, and outputting the location information received over a second
  • Each of the plurality of GPS radios is given an identification number for identifying itself, and the identification number is transmitted together with the location in ⁇ formation, so that the identification number of each GPS radio is displayed on a cor ⁇ responding location when the location information received from the wireless/wire location share repeater is outputted on the screen.
  • FIG. 1 is a schematic diagram illustrating a multilateral location share system according to an embodiment of the present invention
  • FIG. 2 is a block diagram il- lustrating a configuration of a GPS radio according to the present invention
  • FIG. 3 is a block diagram illustrating a configuration of a wireless/wire location share repeater.
  • the present invention provides a multilateral location share system in which a plurality of subscribers carrying a GPS radio 100 share their location information through a wireless/wire location share repeater 200.
  • the GPS radio 100 uses a second common channel as a plurality of transmitting channels and one receiving channel in order to transmit or receive location information and uses a first common channel as one transceiving channel in order to transmit or receive voice information.
  • the GPS radio 100 comprises a GPS receiver 110 for receiving its location in ⁇ formation, a channel selector 120 for detecting an idle channel among a plurality of transmitting channels and selects it as a transmitting channel, a microphone 130 for receiving a voice signal, a transmitter 140 for wirelessly transmitting the location in ⁇ formation and the voice signal, a receiver 150 for receiving a radio signal, a display processor 160 for outputting the signal received by the receiver 150 on a display device, and a speaker 170 for outputting the signal received by the receiver 150.
  • the GPS receiver 110 periodically checks the satellite signal containing its location information transmitted from the GPS satellite and outputs its current location in ⁇ formation.
  • the channel selector 120 is connected to the GPS receiver 110 to scan a plurality of transmitting channels set to be used to transmit the location information between a plurality of GPS radios 100 to detect an idle channel and selects the idle channel as the transmitting channel.
  • the idle channel means a channel which is not currently used.
  • the oscillating frequencies are compared to an os ⁇ cillating frequency corresponding to a channel detected in the radio signal received by the receiver 150, and one among channels corresponding to oscillating frequencies which are not matched is selected as the transmitting channel.
  • the microphone 130 receives the voice signal from an external portion and converts it into an electrical signal.
  • the transmitter 140 is connected to the GPS receiver 110, the channel selector 120 and the microphone 130 to transmit the location information outputted from the GPS receiver 110 over the transmitting channel detected by the channel selector 120 and the voice signal inputted through the microphone 130 over the first common channel set to be used to transmit the voice information among a plurality of GPS radios 100 through an antenna 145.
  • the receiver 150 detects a channel of a signal received over the transmitting channel and outputs the channel information to the channel selector 120, amplifies the voice information received over the first common channel and outputs it to the speaker 170, and outputs the location information received over the second common channel set to be used when receiving the location information of a plurality of GPS radios 100 to the display processor 160.
  • the display processor 160 comprises a storage portion which contains an electronic map having map data and combines the location in ⁇ formation outputted from the receiver 150 with the electronic map and outputs it on the display device.
  • the storage portion stores map data which shows a prescribed region in a unit of each administrative district and is preferably a removable memory. Al ⁇ ternatively, the electronic map can be downloaded from an external map storing server whenever map data showing a prescribed region in a unit of each administrative district in detail is needed.
  • the speaker 170 is connected to the receiver 150 to output the amplified voice in ⁇ formation.
  • the wireless/wire location share repeater 200 receives the location over the transmitting channel selected by the channel selector 120 of each of the GPS radios 100 and temporarily stores it, and transmits the temporarily stored location information over the second common channel which is one common channel set as a receiving channel by the GPS radios 100.
  • a detailed configuration of the location share repeater 200 is as follows.
  • a location information transceiver 211 receives the location information transmitted over the transmitting channel selected by the channel selector 120 of each of the GPS radios 100 and periodically transmits all of the received location information over the second common channel.
  • a frequency synthesizer 212 scans a plurality of channels used when a plurality of GPS radios 100 transmit the location information, and when the signal received by the location information transceiver 211 is outputted during the scanning process, it makes a signal reception continually performed over a channel detected in the signal.
  • a location information storing portion 213 temporarily stores the location in ⁇ formation received from a plurality of GPS radios 100.
  • a connector 214 is to provide a wire line connection through a connection jack to transmit the location information stored in the location information storing portion 213 to an external computer.
  • a modem 215 is to transmit the location information stored in the location information storing portion 213 via an Internet network. This con ⁇ figuration is to transmit the location information to the external computer accessed to the Internet network.
  • a codec 216 compresses the location information stored in the location information storing portion 213 to be transmitted through the location information transceiver 211.
  • a transmitting controller 217 applies a control signal for the location information transceiver 211 to periodically transmit all of the location information stored in the location information storing portion 213.
  • the transmission period of the location information is preferably about 3 to 7 seconds, and it is to minimize a time sub ⁇ stantially taken for the location information to be displayed on the GPS radio 100.
  • a key input portion 218 comprises key buttons for inputting a digit or a text, and a display 219 displays a current operation status of the location share repeater 200 on a screen.
  • the current operation status represents a receiving channel of the location information received by the location information transceiver 211.
  • a repeater controller 220 is connected to the location information transceiver 211, the frequency synthesizer 212, the location information storing portion 213, the connector 214, the modem 215, the codec 216, the transmitting controller 217, the key input portion 218, and the display 219 to control the whole operation of the location share repeater 200.
  • FIG. 4 shows a location share screen according to an embodiment of the present invention.
  • FIG. 4 is a screen of one of a plurality of GPS radios on which its location and locations of other GPS radios are displayed.
  • the group means a group whose members use the same frequency channel.
  • the location information displayed may be indicated by information about the corresponding GPS radio.
  • the information about the GPS radio contains in ⁇ formation which represents a user of the corresponding GPS radio or a radio char ⁇ acteristic number characteristic to the corresponding GPS radio. For example, since an identification code number for identifying each GPS radio is transmitted together with the location information, when the location information of each GPS radio received from the location share repeater is displayed on the screen, the location of the cor ⁇ responding GPS radio can be indicated by the identification code number.
  • FIG. 5 shows a channel allocation in the multilateral location share system according to the present invention.
  • frequency channels of from Fl to F30 are allocated as a transceiving channel of the location information, and a frequency channel F31 is allocated as a transceiving channel of the voice information.
  • the frequency channels of from Fl to F29 are set as the transmitting channel for the GPS radio transmitting its location information, and among these an idle channel detected by the frequency channel scanning process is selected as the transmitting channel.
  • the voice information is received over the frequency channel F31.
  • FIG. 6 is a flowchart illustrating a process for selecting the transmitting channel in the multilateral location share system according to the present invention.
  • the channel selector sets a scanning channel area corresponding to a plurality of frequency channels allocated as the transmitting channel of the location information of the GPS radio (SlOO).
  • the channel selector forms the oscillating frequency of a channel to be scanned
  • a frequency of the signal received by the receiver is compared to the os ⁇ cillating frequency of the channel to be scanned (S300).
  • the transmitting channel is randomly selected among the frequency channels which are not matched with the frequency of the received signal (S400).
  • FIG. 7 shows that the multilateral location share system of the present invention is applied to a police system by way of example.
  • a certain group to which GPS radio users, i.e., policemen belong comprises district unit groups 2 each of which controls a policeman group 1 of policemen having the GPS radio 100 which uses a frequency channel with a predetermined limited range and a central control group 3 which controls the district unit groups 2.
  • the wireless/wire location share repeater is installed in the police station which controls the district unit group 2 to which a plurality of policemen having the GPS radio belong.
  • the location share repeater is connected to a network of the police station which controls the corresponding district or to the central control group 3 via a wire network or an Internet network to transmit the received location information.
  • the policeman group 1 having the GPS radio, the district unit group 2 and the central control group 3 can share the location information of a plurality of GPS radios.
  • the policemen group 1 transmits their location information in real time and the location share repeater periodically transmits the received location information of the policemen, so that it is possible to perceive the locations of all policemen located in the corresponding district.
  • a plurality of GPS radios can be aware of locations of all GPS radios which use the allocated frequency channel as the transmitting channel as well as its location by a relaying operation of the location share repeater, and thus the GPS radio can easily perceive the locations of other GPS radios belonging to the same group.

Abstract

The present invention discloses a multilateral location share system in which location in¬ formation and location change information of other subscribers belonging to the same group are displayed on its GPS radio when location change of other subscribers happens. The multilateral location share system comprises a plurality of GPS radios and a wireless/wire location share repeater which controls a group to which a plurality of GPS radios belong. The GPS radio transmits its current location information received from a GPS satellite over an idle channel detected by a channel selector, and the wireless/wire location share repeater temporarily stores the location information received from a plurality of GPS radios and periodically transmits the location information over a second common channel set to be commonly used for the GPS radios to receive the location information according to a control signal of a transmitting controller. Accordingly, a policeman having the GPS radio can perceive locations of his/her colleagues belonging to the same group as well as his/her location, and also the police station which controls the group can be aware of current location of all policemen belonging to the group.

Description

Description
SHARE SYSTEM USING GPS-HANDIE TALKIE AND, WIRELESS AND WIRED REPEATER
Technical Field
[1] The present invention relates to a multilateral location share system and, more par¬ ticularly, to a multilateral location share system in which location information and location change information of other subscribers belonging to the same group are displayed on its GPS radio when location change of other subscribers happens. Background Art
[2] The global positioning system (GPS) has been developed since early 1970's and it receives a signal containing a specific code (i.e., Coarse Acquisition (C/A) code) transmitted from GPS satellites to calculate its current location (longitude, latitude, and altitude). In the early stage, the GPS was developed for military purpose but it is currently used for commercial purpose. Due to the GPS, 24-hour position de¬ termination is possible, and its error range is about 100m and so it is very accurate.
[3] For the GPS system, four or five GPS satellites are arranged in each of six orbits which form an inclination of 55 degree with the equator, and so GPS terminals communicate with four or more GPS satellites anywhere on the earth.
[4] A location coordinate value using the GPS system is obtained by measuring a distance of from the GPS satellite to the GPS terminal using a triangulation principle which uses the GPS satellite as a reference point. That is, a distance between the GPS satellite and the GPS terminal can be obtained by multiplying a time taken until the GPS terminal receives the signal transmitted from the GPS satellite by light velocity. At this time, a time difference between a time of when the GPS satellite transmits the signal and a time of when the GPS terminal receives the signal should be accurately considered. To this end, the GPS satellite contains an extremely precise atomic clock using vibration of an atom therein, and the GPS terminal contains an appropriately accurate clock instead of the high-priced atomic clock, and a time difference between the atomic clock of the GPS satellite and the clock of the GPS terminal is corrected for synchronization there between. Three GPS satellites are needed to calculate a location, and four GPS satellites are needed to calculate an altitude as well as a location. The GPS system comprises a satellite portion, a territory controller portion, and a user to receive information transmitted from the GPS satellite to measure a location of a stationary or moving object on the ground, on the sea, and in the air, i.e., anywhere on the earth.
[5] A location measurement in the conventional GPS system is as follows. [6] The GPS satellite periodically transmits the C/A code under control of the territory controller, and the GPS terminal receives the C/A code transmitted from the GPS satellite and measures its location based on the received C/A code. Then, the GPS terminal indicates the measured location on an electronic map so that the user can be aware of his/her location.
[7] As a light weight, small-sized GPS receiver (size: width/length within about 30mm) is recently developed, a small-sized GPS terminal comes into wide use, and the GPS system is widely used in various fields which requires location tracking technology due to its convenience and low price.
[8] However, the conventional location tracking system using the GPS system provides a function for checking its current location, but it does not provide information of other subscribers belonging to a certain group.
[9]
[10] Meanwhile, the radio provides a function for exchanging information by in¬ terchanging a voice signal between two subscribers over a prescribed frequency.
[11] The radio is widely used by people such as the police who patrol an area or building, firefighters who are thrown into to put out fires, labors who work at a remote distance in a building site to communicate with colleagues or a control room.
[12] For example, when the police patrol, they have to communicate with their colleagues or a police station by voice communication using the radio to check their patrolling area to prevent their patrolling area from overlapping with their colleagues. Also, when the police are urgently thrown into the scene of the crime, it is difficult to perceive location of their colleagues, so that investigation coordination with their colleagues is not done efficiently. Disclosure of Invention Technical Problem
[13] It is an object of the present invention to provide a multilateral location share system in which a plurality of radios belonging to the same groups are aware of location of other radios such that a channel for transmitting location information and a channel for receiving location information are separated, and each of a plurality of GPS radios transmits its location information using as a transmitting channel an idle channel detected by scanning a plurality of transmitting channels, and so a wireless/ wire location share repeater receives the location information and periodically transmits the location information to a plurality of GPS radio Brief Description of the Drawings
[14] The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred em- bodiments thereof with reference to the attached drawings in which:
[15] FIG. 1 is a schematic diagram illustrating a multilateral location share system according to an embodiment of the present invention;
[16] FIG. 2 is a block diagram illustrating a configuration of a GPS radio according to the present invention;
[17] FIG. 3 is a block diagram illustrating a configuration of a wireless/wire location share repeater;
[18] FIG. 4 shows a location share screen according to an embodiment of the present invention;
[19] FIG. 5 shows a channel allocation in the multilateral location share system according to the present invention;
[20] FIG. 6 is a flowchart illustrating a process for selecting a transmitting channel in the multilateral location share system according to the present invention; and
[21] FIG. 7 shows that the multilateral location share system of the present invention is applied to a police system by way of example. Best Mode for Carrying Out the Invention
[22] One aspect of the present invention is to provide a multilateral location share system, comprising: a plurality of GPS radios, each of which includes: a GPS receiver receiving a satellite signal containing its location information transmitted from a satellite; a channel selector connected to the GPS receiver to scan a plurality of transmitting channels set to be used to transmit the location information between the plurality of GPS radios to detect an idle channel and selecting an idle channel as a transmitting channel; a microphone receiving a voice signal from an external portion; a transmitter connected to the GPS receiver, the channel selector and the microphone to transmit the location information outputted from the GPS receiver over the transmitting channel detected by the channel selector and the voice signal inputted through the microphone over a first common channel set to be used to transmit the voice information among the plurality of GPS radios; a receiver detecting a channel of a signal received over the transmitting channel and outputting the channel information to the channel selector, amplifying and outputting the voice information received over the first common channel to the speaker, and outputting the location information received over a second common channel set to be used when receiving the location in¬ formation of the plurality of GPS radios to a display processor; the display processor including a storage portion which contains an electronic map having map data and combining the location information outputted from the receiver with the electronic map and outputs the combined information on a screen; and a speaker connected to the receiver to output the amplified voice information; and a wireless/wire location share repeater including: a location information transceiver receiving the location in¬ formation from the plurality of GPS radios and periodically transmitting all of the received location information over the second common channel; a frequency synthesizer scanning a plurality of channels used when the plurality of GPS radios transmits the location information, and making a signal reception continually performed over a channel detected in a signal outputted from the location information transceiver; a location information storing portion temporarily storing the location in¬ formation received from the plurality of GPS radios; a connector for providing a wire line connection to transmit the location information stored in the location information storing portion to an external computer; a modem for transmitting the location in¬ formation stored in the location information storing portion to the external computer having access to an Internet network; a codec compressing the location information stored in the location information storing portion to be transmitted through the location information transceiver; a transmitting controller applying a control signal for the location information transceiver to periodically transmit all of the location information stored in the location information storing portion; a key input portion having key buttons for inputting a digit or a text; a display portion displaying a current operation status of the location share repeater on a screen; and a repeater controller connected to the location information transceiver, the frequency synthesizer, the location in¬ formation storing portion, the connector, the modem, the codec, the transmitting controller, the key input portion, and the display to control the whole operation of the location share repeater.
[23] Each of the plurality of GPS radios is given an identification number for identifying itself, and the identification number is transmitted together with the location in¬ formation, so that the identification number of each GPS radio is displayed on a cor¬ responding location when the location information received from the wireless/wire location share repeater is outputted on the screen.
[24] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these em¬ bodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the thickness of layers and regions are exaggerated for clarity. Like numbers refer to like elements throughout the specification.
[25]
[26] FIG. 1 is a schematic diagram illustrating a multilateral location share system according to an embodiment of the present invention, FIG. 2 is a block diagram il- lustrating a configuration of a GPS radio according to the present invention, and FIG. 3 is a block diagram illustrating a configuration of a wireless/wire location share repeater.
[27] As shown in the drawings, the present invention provides a multilateral location share system in which a plurality of subscribers carrying a GPS radio 100 share their location information through a wireless/wire location share repeater 200. The GPS radio 100 uses a second common channel as a plurality of transmitting channels and one receiving channel in order to transmit or receive location information and uses a first common channel as one transceiving channel in order to transmit or receive voice information.
[28] The GPS radio 100 comprises a GPS receiver 110 for receiving its location in¬ formation, a channel selector 120 for detecting an idle channel among a plurality of transmitting channels and selects it as a transmitting channel, a microphone 130 for receiving a voice signal, a transmitter 140 for wirelessly transmitting the location in¬ formation and the voice signal, a receiver 150 for receiving a radio signal, a display processor 160 for outputting the signal received by the receiver 150 on a display device, and a speaker 170 for outputting the signal received by the receiver 150.
[29] The GPS receiver 110 periodically checks the satellite signal containing its location information transmitted from the GPS satellite and outputs its current location in¬ formation.
[30] The channel selector 120 is connected to the GPS receiver 110 to scan a plurality of transmitting channels set to be used to transmit the location information between a plurality of GPS radios 100 to detect an idle channel and selects the idle channel as the transmitting channel. Here, the idle channel means a channel which is not currently used. In more detail, while oscillating frequencies corresponding to a plurality of transmitting channels are oscillated, the oscillating frequencies are compared to an os¬ cillating frequency corresponding to a channel detected in the radio signal received by the receiver 150, and one among channels corresponding to oscillating frequencies which are not matched is selected as the transmitting channel.
[31] The microphone 130 receives the voice signal from an external portion and converts it into an electrical signal.
[32] The transmitter 140 is connected to the GPS receiver 110, the channel selector 120 and the microphone 130 to transmit the location information outputted from the GPS receiver 110 over the transmitting channel detected by the channel selector 120 and the voice signal inputted through the microphone 130 over the first common channel set to be used to transmit the voice information among a plurality of GPS radios 100 through an antenna 145.
[33] The receiver 150 detects a channel of a signal received over the transmitting channel and outputs the channel information to the channel selector 120, amplifies the voice information received over the first common channel and outputs it to the speaker 170, and outputs the location information received over the second common channel set to be used when receiving the location information of a plurality of GPS radios 100 to the display processor 160. The display processor 160 comprises a storage portion which contains an electronic map having map data and combines the location in¬ formation outputted from the receiver 150 with the electronic map and outputs it on the display device. The storage portion stores map data which shows a prescribed region in a unit of each administrative district and is preferably a removable memory. Al¬ ternatively, the electronic map can be downloaded from an external map storing server whenever map data showing a prescribed region in a unit of each administrative district in detail is needed.
[34] The speaker 170 is connected to the receiver 150 to output the amplified voice in¬ formation.
[35]
[36] The wireless/wire location share repeater 200 receives the location over the transmitting channel selected by the channel selector 120 of each of the GPS radios 100 and temporarily stores it, and transmits the temporarily stored location information over the second common channel which is one common channel set as a receiving channel by the GPS radios 100. A detailed configuration of the location share repeater 200 is as follows.
[37] A location information transceiver 211 receives the location information transmitted over the transmitting channel selected by the channel selector 120 of each of the GPS radios 100 and periodically transmits all of the received location information over the second common channel. A frequency synthesizer 212 scans a plurality of channels used when a plurality of GPS radios 100 transmit the location information, and when the signal received by the location information transceiver 211 is outputted during the scanning process, it makes a signal reception continually performed over a channel detected in the signal.
[38] A location information storing portion 213 temporarily stores the location in¬ formation received from a plurality of GPS radios 100.
[39] A connector 214 is to provide a wire line connection through a connection jack to transmit the location information stored in the location information storing portion 213 to an external computer. A modem 215 is to transmit the location information stored in the location information storing portion 213 via an Internet network. This con¬ figuration is to transmit the location information to the external computer accessed to the Internet network.
[40] A codec 216 compresses the location information stored in the location information storing portion 213 to be transmitted through the location information transceiver 211. A transmitting controller 217 applies a control signal for the location information transceiver 211 to periodically transmit all of the location information stored in the location information storing portion 213. Here, the transmission period of the location information is preferably about 3 to 7 seconds, and it is to minimize a time sub¬ stantially taken for the location information to be displayed on the GPS radio 100. A key input portion 218 comprises key buttons for inputting a digit or a text, and a display 219 displays a current operation status of the location share repeater 200 on a screen. Here, the current operation status represents a receiving channel of the location information received by the location information transceiver 211. A repeater controller 220 is connected to the location information transceiver 211, the frequency synthesizer 212, the location information storing portion 213, the connector 214, the modem 215, the codec 216, the transmitting controller 217, the key input portion 218, and the display 219 to control the whole operation of the location share repeater 200.
[41]
[42] FIG. 4 shows a location share screen according to an embodiment of the present invention. FIG. 4 is a screen of one of a plurality of GPS radios on which its location and locations of other GPS radios are displayed.
[43] As shown in FIG. 4, locations of all GPS radios including its location are displayed on the GPS radio belonging to the same group. Here, the group means a group whose members use the same frequency channel.
[44] Preferably, the location information displayed may be indicated by information about the corresponding GPS radio. The information about the GPS radio contains in¬ formation which represents a user of the corresponding GPS radio or a radio char¬ acteristic number characteristic to the corresponding GPS radio. For example, since an identification code number for identifying each GPS radio is transmitted together with the location information, when the location information of each GPS radio received from the location share repeater is displayed on the screen, the location of the cor¬ responding GPS radio can be indicated by the identification code number.
[45]
[46] FIG. 5 shows a channel allocation in the multilateral location share system according to the present invention.
[47] As shown in FIG. 5, frequency channels of from Fl to F30 are allocated as a transceiving channel of the location information, and a frequency channel F31 is allocated as a transceiving channel of the voice information. The frequency channels of from Fl to F29 are set as the transmitting channel for the GPS radio transmitting its location information, and among these an idle channel detected by the frequency channel scanning process is selected as the transmitting channel. The voice information is received over the frequency channel F31.
[48]
[49] FIG. 6 is a flowchart illustrating a process for selecting the transmitting channel in the multilateral location share system according to the present invention. The channel selector sets a scanning channel area corresponding to a plurality of frequency channels allocated as the transmitting channel of the location information of the GPS radio (SlOO).
[50] The channel selector forms the oscillating frequency of a channel to be scanned
(S200). A frequency of the signal received by the receiver is compared to the os¬ cillating frequency of the channel to be scanned (S300). The transmitting channel is randomly selected among the frequency channels which are not matched with the frequency of the received signal (S400).
[51]
[52] FIG. 7 shows that the multilateral location share system of the present invention is applied to a police system by way of example.
[53] A certain group to which GPS radio users, i.e., policemen belong comprises district unit groups 2 each of which controls a policeman group 1 of policemen having the GPS radio 100 which uses a frequency channel with a predetermined limited range and a central control group 3 which controls the district unit groups 2.
[54] The wireless/wire location share repeater is installed in the police station which controls the district unit group 2 to which a plurality of policemen having the GPS radio belong. The location share repeater is connected to a network of the police station which controls the corresponding district or to the central control group 3 via a wire network or an Internet network to transmit the received location information. The policeman group 1 having the GPS radio, the district unit group 2 and the central control group 3 can share the location information of a plurality of GPS radios.
[55] Accordingly, the policemen group 1 transmits their location information in real time and the location share repeater periodically transmits the received location information of the policemen, so that it is possible to perceive the locations of all policemen located in the corresponding district.
[56] Whenever location change happens, the changed location is notified by the voice to thereby prevent troublesome and delay in resolving a case, and when the location in¬ formation cannot be notified by the voice, it is possible to prevent the policeman from being isolated. Further, since the current location and location change of all policemen in the same group can be perceived, it is possible to make an operation efficient to resolve the case. Also, it is possible to prevent crime preventing and patrolling work of the policemen from being overlapped with their colleagues. Industrial Applicability
[57] As described above, according to the present invention, a plurality of GPS radios can be aware of locations of all GPS radios which use the allocated frequency channel as the transmitting channel as well as its location by a relaying operation of the location share repeater, and thus the GPS radio can easily perceive the locations of other GPS radios belonging to the same group.
[58] The voice communication function which is an inherent function of the radio as well as the location displaying function is possible, and thus work coordination with their colleagues can be done efficiently.

Claims

Claims
[1] A multilateral location share system, comprising: a plurality of GPS radios, each of which includes: a GPS receiver receiving a satellite signal containing its location information transmitted from a satellite; a channel selector connected to the GPS receiver to scan a plurality of transmitting channels set to be used to transmit the location information between the plurality of GPS radios to detect an idle channel and selecting an idle channel as a transmitting channel; a microphone receiving a voice signal from an external portion; a transmitter connected to the GPS receiver, the channel selector and the microphone to transmit the location information outputted from the GPS receiver over the transmitting channel detected by the channel selector and the voice signal inputted through the microphone over a first common channel set to be used to transmit the voice information among the plurality of GPS radios; a receiver detecting a channel of a signal received over the transmitting channel and outputting the channel information to the channel selector, amplifying and outputting the voice information received over the first common channel to the speaker, and outputting the location information received over a second common channel set to be used when receiving the location information of the plurality of GPS radios to a display processor; the display processor including a storage portion which contains an electronic map having map data and combining the location information outputted from the receiver with the electronic map and outputs the combined information on a screen; and a speaker connected to the receiver to output the amplified voice information; and a wireless/wire location share repeater including: a location information transceiver receiving the location information from the plurality of GPS radios and periodically transmitting all of the received location information over the second common channel; a frequency synthesizer scanning a plurality of channels used when the plurality of GPS radios transmit the location information, and making a signal reception continually performed over a channel detected in a signal outputted from the location information transceiver; a location information storing portion temporarily storing the location in¬ formation received from the plurality of GPS radios; a connector for providing a wire line connection to transmit the location in¬ formation stored in the location information storing portion to an external computer; a modem for transmitting the location information stored in the location in¬ formation storing portion to the external computer having access to an Internet network; a codec compressing the location information stored in the location information storing portion to be transmitted through the location information transceiver; a transmitting controller applying a control signal for the location information transceiver to periodically transmit all of the location information stored in the location information storing portion; a key input portion having key buttons for inputting a digit or a text; a display portion displaying a current operation status of the location share repeater on a screen; and a repeater controller connected to the location information transceiver, the frequency synthesizer, the location information storing portion, the connector, the modem, the codec, the transmitting controller, the key input portion, and the display to control the whole operation of the location share repeater.
[2] The system of claim 1, wherein each of the plurality of GPS radios is given an identification number for identifying itself, and the identification number is transmitted together with the location information, so that the identification number of each GPS radio is displayed on a corresponding location when the location information received from the wireless/wire location share repeater is outputted on the screen.
PCT/KR2005/003875 2004-11-19 2005-11-16 Location share system using gps-handie talkie and, wireless and wired repeater WO2006054858A1 (en)

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