WO2015080555A1 - Method and system for determining a location of an indoor receiver - Google Patents

Method and system for determining a location of an indoor receiver Download PDF

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Publication number
WO2015080555A1
WO2015080555A1 PCT/MY2014/000135 MY2014000135W WO2015080555A1 WO 2015080555 A1 WO2015080555 A1 WO 2015080555A1 MY 2014000135 W MY2014000135 W MY 2014000135W WO 2015080555 A1 WO2015080555 A1 WO 2015080555A1
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WO
WIPO (PCT)
Prior art keywords
angle
location
transmitters
indoor receiver
transmission
Prior art date
Application number
PCT/MY2014/000135
Other languages
French (fr)
Inventor
Kee Ngoh Ting
Seh Chun NG
Heng Tze Chieng
Original Assignee
Mimos Berhad
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 Mimos Berhad filed Critical Mimos Berhad
Publication of WO2015080555A1 publication Critical patent/WO2015080555A1/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
    • G01S5/02—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
    • G01S5/08—Position of single direction-finder fixed by determining direction of a plurality of spaced sources 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
    • 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
    • G01S5/0045—Transmission from base station to mobile station
    • 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
    • G01S5/12—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 by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial

Definitions

  • This invention relates to a method and a system for determining a location of an indoor receiver.
  • a positioning system for examples, interplanetary-radio communication system, global navigation satellite system (GNSS), and regional system, is used to determine the location of an object. People are widely relying on these positioning systems, especially global positioning system (GPS) of the GNSS, but unlike in outdoor environments, GPS does not work well in indoor spaces.
  • GPS global positioning system
  • the positioning system For indoor positioning, instead of using satellites, the positioning system relies on nearby anchors with a known position which either actively locate tags or provide environmental contexts for devices to identify and communicate with.
  • the non-GPS positioning techniques include techniques such as triangulation, proximity, and scene analysis.
  • Patent US 8,395,968 B2 relates to indoor position determination using building information and/or power lines.
  • the application may not be universal as not all building information is obtainable and reliable, and most of the hardwares integrated in the device of said patent are generally expensive.
  • the corners and walls of the building may disrupt the signals transmitted by the device while predicting the location of the indoor device.
  • Patent publication no. US 2013/0003572 A1 disclosed an indoor position determination method and system based on WLAN signal strength.
  • the position of the indoor device is determined and calculated in access point.
  • the disadvantage of using the method and system proposed in said patent is that the design of WLAN infrastructure usually requires error-prone calibration for avoiding dead-corners in receiving the signal and that the signal is randomly distributed.
  • the method in said patent which includes comparing signal strength pattern of each access points may not be accurate.
  • the system for determining the location of an indoor receiver is characterized by: at least a pair of transmitters having a smart antenna for broadcasting a plurality of IP to the indoor receiver, wherein each IP comprises a transmission angle and a transmitter location; a transmit angle generator (TAG) for determining the angle of each transmission angle; a transmit angle controller (TAC) for controlling the smart antenna to create the transmission angle having the angle determined by TAG; and a positioning packet generator (PPG) for generating the plurality of IP.
  • TAG transmit angle generator
  • TAC transmit angle controller
  • PPG positioning packet generator
  • an objective of the present invention is to provide a method for determining the location of an indoor receiver. Furthermore, an objective of the present invention is to perform position calculation in a client's device which is also known as the indoor receiver. It is another objective of the present invention to use a minimum of two transmitters to determine the location of the indoor receiver. Accordingly, these objectives may be achieved by following the teachings of the present invention.
  • the present invention relates to a method for determining the location of an indoor receiver, the method is characterized by the steps of: providing a plurality of transmission angles from at least a pair of transmitter having a smart antenna; generating a plurality of information packets (IP) by the pair of transmitters, wherein each IP comprises a transmission angle and a transmitter location; broadcasting the plurality of IP to the indoor receiver; inputting the plurality of IP into a table by the indoor receiver; selecting the IP with the highest received signal strength (RSS) value from each of the transmitters; and calculating the location of the indoor receiver based on the transmission angle and the transmitter location of the selected IP.
  • IP information packets
  • Figure 1 is a flowchart of a method for determining the location of an indoor receiver
  • Figure 2 is a diagram showing triangulation method to calculate the location of the indoor receiver.
  • Figure 3 shows a table stored in the indoor receiver.
  • the present invention provides a system for determining a location of the indoor receiver, which is characterized by: at least a pair of transmitters having a smart antenna for broadcasting a plurality of IP to the indoor receiver, wherein each IP comprises a transmission angle and a transmitter location; a transmit angle generator (TAG) for determining the angle of each transmission angle; a transmit angle controller (TAC) for controlling the smart antenna to create the transmission angle having the angle determined by TAG; and a positioning packet generator (PPG) for generating the plurality of IP.
  • the transmitter is access point or base station.
  • the smart antenna is of switched beam, phased array, or directional type.
  • the present invention also relates to a method for determining the location of an indoor receiver, the method is characterized by the steps of: providing a plurality of transmission angles from at least a pair of transmitters (100) having a smart antenna; generating a plurality of information packets (IP) by the pair of transmitters, wherein each IP comprises a transmission angle and a transmitter location (200); broadcasting the plurality of IP to the indoor receiver (300); inputting the plurality of IP into a table by the indoor receiver (400); selecting the IP with the highest received signal strength (RSS) value from each of the transmitters (500); and calculating the location of the indoor receiver (600) based on the transmission angle and the transmitter location of the selected IP.
  • IP information packets
  • more than two transmitters may be used depending on the requirements of the system and the indoor space.
  • the transmitter is access point or base station.
  • a smart antenna of types such as switched beam, phased array, or directional antenna is coupled to the transmitter for broadcasting the plurality of IP to the indoor receiver in a small beam-width radiation pattern or directional pattern.
  • Each of the IP has different transmission angle, which is determined by a transmission angle generator (TAG). Thereafter, this particular information is relayed to a transmit angle controller (TAC), which then decides as how to control the smart antenna depending on the type of smart antenna in order to create the transmission angle with the angle determined by TAG. Therefore, the plurality of IP that are broadcasted by the transmitters has different transmission angles.
  • TAG transmission angle generator
  • TAC transmit angle controller
  • the TAG and TAC are located in the transmitter.
  • the step of generating the plurality of IP by the pair of transmitters (200) is carried out by a positioning packet generator (PPG).
  • PPG positioning packet generator
  • the PPG is located in the transmitter.
  • the indoor receiver has an omni-directional antenna to receive the plurality of IP.
  • the step of inputting the plurality of IP into the table by the indoor receiver (400) further comprises the steps: of extracting the transmission angles and the transmitter locations from the IP, and inputting said transmission angles and said transmitter locations into the table.
  • the indoor receiver continuously updates and inputs the plurality of IP into the table as the transmitters continuously broadcast the plurality of IP to the indoor receiver.
  • Figure 3 shows an example of the table stored in the indoor receiver.
  • the step of selecting IP with the highest RSS values from each of the transmitters (500) further comprises the steps of: identifying the highest RSS value projected from each of the transmitters; selecting the IP with respect to the highest RSS value by referring to the table; and extracting the transmission angle and the transmitter location from the selected IP. These steps take place in the indoor receiver.
  • the highest RSS value indicates that the broadcast signal is the strongest among the rest, thus implying that the transmission angle is pointing closer to the location of the indoor receiver.
  • the extracted transmission angle and transmitter location will then be used to calculate the location of the indoor receiver.
  • the calculation of the location of the indoor receiver takes place in the indoor receiver.
  • the step of calculating location of the indoor receiver (600) further includes equations (D - (4).
  • Vuser ( 3 ⁇ 4 + 3 ⁇ 4) Sin(/?) (4)
  • the step of calculating location of the indoor receiver (600) is by using triangulation method.

Abstract

The present invention relates to a method for determining a location of an indoor receiver by using a system comprising at least pair of transmitters having a smart antenna, a transmit angle generator (TAG), a transmit angle controller (TAC), and a positioning packet generator (PPG), the method is characterized by the steps of: providing a plurality of transmission angles of the transmitters (100); generating a plurality of information packets (IP), wherein each IP comprises a transmission angle and a transmitter location (200); broadcasting the plurality of IP to the indoor receiver (300); inputting the plurality of IP into a table (400); selecting IP with the highest received signal strength (RSS) value (500); and calculating the location of the indoor receiver (600) based on the transmission angle and transmitter location of the selected IP.

Description

METHOD AND SYSTEM FOR DETERMINING A LOCATION OF AN INDOOR
RECEIVER TECHNICAL FIELD OF THE INVENTION
This invention relates to a method and a system for determining a location of an indoor receiver.
BACKGROUND OF THE INVENTION
A positioning system, for examples, interplanetary-radio communication system, global navigation satellite system (GNSS), and regional system, is used to determine the location of an object. People are widely relying on these positioning systems, especially global positioning system (GPS) of the GNSS, but unlike in outdoor environments, GPS does not work well in indoor spaces.
For indoor positioning, instead of using satellites, the positioning system relies on nearby anchors with a known position which either actively locate tags or provide environmental contexts for devices to identify and communicate with. The non-GPS positioning techniques include techniques such as triangulation, proximity, and scene analysis.
Some of the conventional methods for determining indoor location require at least 3 access points to predict and calculate the location. However, such methods are inefficient and the prediction of the location may not be accurate. Furthermore, some of the conventional techniques are also too complex to be implemented and are too expensive to be integrated, especially in small-to medium-scaled industries. International publication no. WO 2011/090541 A1 is related to an indoor positioning system based on GPS signals. In this patent, among the features are having at least 3 GPS antennae for picking up specific GPS signals, and at least 3 RF GPS repeaters. One of the shortcomings of the invention in said patent is that the GPS can be inaccurate and more complicated to use in indoor spaces. It may also pose another challenge if the indoor space is not able to receive satellite signals. In addition, the method disclosed in the patent which requires multiple calculations to determine the accuracy and real ranges of the indoor receiver may overwhelm the system and user. Thus, there is a need to overcome said shortcomings.
Patent US 8,395,968 B2 relates to indoor position determination using building information and/or power lines. However, the application may not be universal as not all building information is obtainable and reliable, and most of the hardwares integrated in the device of said patent are generally expensive. Besides that, the corners and walls of the building may disrupt the signals transmitted by the device while predicting the location of the indoor device. Patent publication no. US 2013/0003572 A1 disclosed an indoor position determination method and system based on WLAN signal strength. In this patent, the position of the indoor device is determined and calculated in access point. The disadvantage of using the method and system proposed in said patent is that the design of WLAN infrastructure usually requires error-prone calibration for avoiding dead-corners in receiving the signal and that the signal is randomly distributed. Besides that, the method in said patent which includes comparing signal strength pattern of each access points may not be accurate.
Accordingly, it can be seen in the prior art that there exists a need to provide a method and a system for determining a location of an indoor receiver accurately and efficiently without complicating the whole methodology.
SUMMARY OF THE INVENTION
It is an objective of the present invention to provide a system for determining the location of an indoor receiver. In accordance with the objective of the present invention the system for determining the location of an indoor receiver, is characterized by: at least a pair of transmitters having a smart antenna for broadcasting a plurality of IP to the indoor receiver, wherein each IP comprises a transmission angle and a transmitter location; a transmit angle generator (TAG) for determining the angle of each transmission angle; a transmit angle controller (TAC) for controlling the smart antenna to create the transmission angle having the angle determined by TAG; and a positioning packet generator (PPG) for generating the plurality of IP.
It is also an objective of the present invention to provide a method for determining the location of an indoor receiver. Furthermore, an objective of the present invention is to perform position calculation in a client's device which is also known as the indoor receiver. It is another objective of the present invention to use a minimum of two transmitters to determine the location of the indoor receiver. Accordingly, these objectives may be achieved by following the teachings of the present invention. The present invention relates to a method for determining the location of an indoor receiver, the method is characterized by the steps of: providing a plurality of transmission angles from at least a pair of transmitter having a smart antenna; generating a plurality of information packets (IP) by the pair of transmitters, wherein each IP comprises a transmission angle and a transmitter location; broadcasting the plurality of IP to the indoor receiver; inputting the plurality of IP into a table by the indoor receiver; selecting the IP with the highest received signal strength (RSS) value from each of the transmitters; and calculating the location of the indoor receiver based on the transmission angle and the transmitter location of the selected IP.
BRIEF DESCRIPTION OF THE DRAWINGS
The features of the invention will be more readily understood and appreciated from the following detailed description when read in conjunction with the accompanying drawings of the preferred embodiment of the present invention, in which: Figure 1 is a flowchart of a method for determining the location of an indoor receiver;
Figure 2 is a diagram showing triangulation method to calculate the location of the indoor receiver; and
Figure 3 shows a table stored in the indoor receiver.
DETAILED DESCRIPTION OF THE INVENTION
The above mentioned and other features and objects of this invention will become more apparent and better understood by reference to the following detailed description. It should be understood that the detailed description made known below is not intended to be exhaustive or to limit the invention to the precise disclosed form as the invention may assume various alternative forms. On the contrary, the detailed description covers all the relevant modifications and alterations made to the present invention, unless the claims expressly state otherwise. The present invention will now be described with reference to Figures 1 to 3.
The present invention provides a system for determining a location of the indoor receiver, which is characterized by: at least a pair of transmitters having a smart antenna for broadcasting a plurality of IP to the indoor receiver, wherein each IP comprises a transmission angle and a transmitter location; a transmit angle generator (TAG) for determining the angle of each transmission angle; a transmit angle controller (TAC) for controlling the smart antenna to create the transmission angle having the angle determined by TAG; and a positioning packet generator (PPG) for generating the plurality of IP. In accordance with an embodiment of the present invention, the transmitter is access point or base station. In accordance with another embodiment of the present invention, the smart antenna is of switched beam, phased array, or directional type.
Referring to Figure 1 , the present invention also relates to a method for determining the location of an indoor receiver, the method is characterized by the steps of: providing a plurality of transmission angles from at least a pair of transmitters (100) having a smart antenna; generating a plurality of information packets (IP) by the pair of transmitters, wherein each IP comprises a transmission angle and a transmitter location (200); broadcasting the plurality of IP to the indoor receiver (300); inputting the plurality of IP into a table by the indoor receiver (400); selecting the IP with the highest received signal strength (RSS) value from each of the transmitters (500); and calculating the location of the indoor receiver (600) based on the transmission angle and the transmitter location of the selected IP.
In an embodiment of the present invention, more than two transmitters may be used depending on the requirements of the system and the indoor space.
In another embodiment of the present invention, the transmitter is access point or base station.
A smart antenna of types such as switched beam, phased array, or directional antenna is coupled to the transmitter for broadcasting the plurality of IP to the indoor receiver in a small beam-width radiation pattern or directional pattern. Each of the IP has different transmission angle, which is determined by a transmission angle generator (TAG). Thereafter, this particular information is relayed to a transmit angle controller (TAC), which then decides as how to control the smart antenna depending on the type of smart antenna in order to create the transmission angle with the angle determined by TAG. Therefore, the plurality of IP that are broadcasted by the transmitters has different transmission angles.
In another embodiment, the TAG and TAC are located in the transmitter. In yet another embodiment of the present invention, the step of generating the plurality of IP by the pair of transmitters (200), is carried out by a positioning packet generator (PPG). In a further embodiment of the present invention, the PPG is located in the transmitter.
In still another embodiment of the present invention, the indoor receiver has an omni-directional antenna to receive the plurality of IP. In a preferred embodiment of the present invention, the step of inputting the plurality of IP into the table by the indoor receiver (400) further comprises the steps: of extracting the transmission angles and the transmitter locations from the IP, and inputting said transmission angles and said transmitter locations into the table. The indoor receiver continuously updates and inputs the plurality of IP into the table as the transmitters continuously broadcast the plurality of IP to the indoor receiver. Figure 3 shows an example of the table stored in the indoor receiver.
In another embodiment of the present invention, the step of selecting IP with the highest RSS values from each of the transmitters (500) further comprises the steps of: identifying the highest RSS value projected from each of the transmitters; selecting the IP with respect to the highest RSS value by referring to the table; and extracting the transmission angle and the transmitter location from the selected IP. These steps take place in the indoor receiver. The highest RSS value indicates that the broadcast signal is the strongest among the rest, thus implying that the transmission angle is pointing closer to the location of the indoor receiver. The extracted transmission angle and transmitter location will then be used to calculate the location of the indoor receiver. The calculation of the location of the indoor receiver takes place in the indoor receiver.
In a further embodiment of the present invention, by referring to Figure 2, the step of calculating location of the indoor receiver (600) further includes equations (D - (4).
Figure imgf000009_0001
cos(/?) )
Dx— /?! cos (a) (2) cos( ?) user + R2) x cos( S) (3)
Vuser = ( ¾ + ¾) Sin(/?) (4)
In an embodiment of the present invention, the step of calculating location of the indoor receiver (600) is by using triangulation method.
Although the present invention has been described with reference to specific embodiments, it will be apparent for those skilled in the art that many variations and modifications can be done within the scope of the invention as described in the specification and defined in the following claims.

Claims

A system for determining a location of an indoor receiver, the system is characterized by:
a) a pair of transmitters having a smart antenna for broadcasting a plurality of information packets (IP) to the indoor receiver, wherein each IP comprises a transmission angle and a transmitter location; b) a transmit angle generator (TAG) for determining the angle of each transmission angle;
c) a transmit angle controller (TAC) for controlling the smart antenna to create the transmission angle having the angle determined by TAG; and
d) a positioning packet generator (PPG) for generating the plurality of IP.
A system according to claim 1 , wherein the transmitter is access point or base station.
A system according to claim 1 , wherein the smart antenna is of switched beam, phased array, or directional type.
A method for determining a location of an indoor receiver, the method is characterized by the steps of:
a) providing a plurality of transmission angles from at least a pair of transmitters (100) having a smart antenna;
b) generating a plurality of information packets (IP) by the pair of transmitters, wherein each IP comprises a transmission angle and a transmitter location (200);
c) broadcasting the plurality of IP to the indoor receiver (300);
d) inputting the plurality of IP into a table by the indoor receiver (400); e) selecting IP with the highest received signal strength (RSS) value from each of the transmitters (500); and f) calculating the location of the indoor receiver (600) based on the transmission angle and the transmitter location of the selected IP.
A method according to claim 4, wherein the step of providing a plurality of transmission angles from the pair of transmitters (100) further comprises the steps of:
a) determining the angle of each transmission angle by a transmit angle generator (TAG);
b) controlling the smart antenna by a transmit angle controller (TAC) to create the transmission angle having the angle determined by TAG.
A method according to claim 4, wherein the step of generating a plurality of IP by the pair of transmitters (200) is carried out by a positioning packet generator (PPG) within the pair of transmitters.
A method according to claim 4, wherein the step of inputting the plurality of IP into the table by the indoor receiver (400) further comprises the steps of:
a) the indoor receiver extracts the transmission angles and the transmitter locations from the IP; and
b) inputting said transmission angles and transmitter locations into the table.
A method according to claim 4, wherein the step of selecting IP with the highest received signal strength (RSS) value from each of the transmitters (500) further comprises the steps of:
a) identifying the highest RSS value projected from each of the transmitters;
b) selecting IP with respect to the highest RSS value by referring to the table; and
c) extracting the transmission angle and the transmitter location from the selected IP.
9. A method according to claim 4, wherein the step of calculating the location of the indoor receiver (600) is by using triangulation method.
PCT/MY2014/000135 2013-11-27 2014-05-29 Method and system for determining a location of an indoor receiver WO2015080555A1 (en)

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MYPI2013702277A MY184629A (en) 2013-11-27 2013-11-27 Method and system for determining a location of an indoor receiver
MYPI2013702277 2013-11-27

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1164477A (en) * 1997-08-22 1999-03-05 Nippon Telegr & Teleph Corp <Ntt> Position detector utilizing broadcast radio wave and information acquisition unit employing it
WO2007017435A1 (en) * 2005-08-11 2007-02-15 International Business Machines Corporation Location system with swept digital beacon
US20090312037A1 (en) * 2008-06-13 2009-12-17 Radiant Technologies, Inc. Apparatus and system for estimating location of terminal
WO2011090541A2 (en) 2009-12-29 2011-07-28 Tv Interactive Systems, Inc. Methods for displaying contextually targeted content on a connected television
US20130003572A1 (en) 2009-11-27 2013-01-03 Kt Corporation Indoor position determination method and system based on wlan signal strength
US8395968B2 (en) 2010-10-08 2013-03-12 HJ Laboratories, LLC Providing indoor location, position, or tracking of a mobile computer using building information
US20130234893A1 (en) * 2012-03-09 2013-09-12 Ricoh Company, Ltd. Broadcasting device, position management system, broadcasting method, and storage medium

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1164477A (en) * 1997-08-22 1999-03-05 Nippon Telegr & Teleph Corp <Ntt> Position detector utilizing broadcast radio wave and information acquisition unit employing it
WO2007017435A1 (en) * 2005-08-11 2007-02-15 International Business Machines Corporation Location system with swept digital beacon
US20090312037A1 (en) * 2008-06-13 2009-12-17 Radiant Technologies, Inc. Apparatus and system for estimating location of terminal
US20130003572A1 (en) 2009-11-27 2013-01-03 Kt Corporation Indoor position determination method and system based on wlan signal strength
WO2011090541A2 (en) 2009-12-29 2011-07-28 Tv Interactive Systems, Inc. Methods for displaying contextually targeted content on a connected television
US8395968B2 (en) 2010-10-08 2013-03-12 HJ Laboratories, LLC Providing indoor location, position, or tracking of a mobile computer using building information
US20130234893A1 (en) * 2012-03-09 2013-09-12 Ricoh Company, Ltd. Broadcasting device, position management system, broadcasting method, and storage medium

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