WO2004075458B1 - Positioning with wireless local area networks and wlan-aided global positioning systems - Google Patents

Positioning with wireless local area networks and wlan-aided global positioning systems

Info

Publication number
WO2004075458B1
WO2004075458B1 PCT/US2004/003468 US2004003468W WO2004075458B1 WO 2004075458 B1 WO2004075458 B1 WO 2004075458B1 US 2004003468 W US2004003468 W US 2004003468W WO 2004075458 B1 WO2004075458 B1 WO 2004075458B1
Authority
WO
WIPO (PCT)
Prior art keywords
access point
wlan
determining
rssi
wireless device
Prior art date
Application number
PCT/US2004/003468
Other languages
French (fr)
Other versions
WO2004075458A3 (en
WO2004075458A2 (en
Inventor
Yi-Hsiu Wang
Original Assignee
Atheros Comm Inc
Yi-Hsiu Wang
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 Atheros Comm Inc, Yi-Hsiu Wang filed Critical Atheros Comm Inc
Publication of WO2004075458A2 publication Critical patent/WO2004075458A2/en
Publication of WO2004075458A3 publication Critical patent/WO2004075458A3/en
Publication of WO2004075458B1 publication Critical patent/WO2004075458B1/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W64/00Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S19/00Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/03Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
    • G01S19/05Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing aiding data
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S19/00Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/03Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
    • G01S19/05Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing aiding data
    • G01S19/06Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing aiding data employing an initial estimate of the location of the receiver as aiding data or in generating aiding data
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S19/00Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13Receivers
    • G01S19/24Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/25Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
    • G01S19/252Employing an initial estimate of location in generating assistance data
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S19/00Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13Receivers
    • G01S19/24Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/28Satellite selection
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S19/00Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13Receivers
    • G01S19/24Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/29Acquisition or tracking or demodulation of signals transmitted by the system carrier including Doppler, related
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S19/00Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/38Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/42Determining position
    • G01S19/48Determining position by combining or switching between position solutions derived from the satellite radio beacon positioning system and position solutions derived from a further system
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02Position-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
    • G01S5/12Position-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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02Position-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
    • G01S5/14Determining absolute distances from a plurality of spaced points of known location
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/185Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851Systems using a satellite or space-based relay
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02Services making use of location information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10Small scale networks; Flat hierarchical networks
    • H04W84/12WLAN [Wireless Local Area Networks]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices

Abstract

Accurate position capability can be quickly provided using a Wireless Local Area Network (WLAN). When associated with a WLAN, a wireless device (102) can quickly determine its relative and/or coordinate position based on information provided by an access point (101) in the WLAN. Before the wireless device (102) disassociates with the access point (101), the WLAN can periodically provide time, location, and decoded GPS data to the wireless device (101). In this manner, the wireless device (102) can significantly reduce the time to acquire the necessary GPS satellite data to determine its coordinate position.

Claims

34 AMENDED CLAIMS [received by the International Bureau on 24 February 2005 (24.02.05); original claims 5-6, 12, 14-16, 24 amended; original claims 1-4, 9-11 cancelled remaining claims unchanged (7 pages)]
CLAIMS 1. (Cancelled)
2. (Cancelled)
3. (Cancelled)
4. (Cancelled)
5. A method of determining a position of a wireless device, the method including: identifying a first access point having a first known location and a predetermined radio propagation range of r, wherein the position of the wireless device is the first known location with an uncertainty of r; determining a first radio signal strength indicator (RSSI) of the first access point; correlating the first RSSI to a first stored distance, wherein the first stored distance represents a first relative distance from the first access point to the wireless device; identifying a second access point and a third access point having a second known location and a third known location, respectively; determining a second RSSI and a third RSSI of the second access point and the third access point, respectively; correlating the second RSSI and the third RSSI to a second stored distance and a third stored distance, respectively, wherein the second stored distance represents a second relative distance from the second access point to the wireless device, and wherein the third stored distance represents a third relative distance from the third access point to the wireless device; and 35 computing a coordinate position of the wireless device using the first, second, and third known positions and the first, second, and third relative distances wherein the first known position is (xl, yl, zl) and the first relative position is rl, wherein the second known position is (x2, y2, z2) and the second relative position is r2, wherein the third known position is (x3, y3 , z3) and the third relative position is r3 , wherein the coordinate position of the wireless device is (xO, yO, zO) and wherein computing the coordinate position includes using a set of equations : xO = (wl * xl) + (w2 * x2) + (w3 * x3), yO = (wl * yl) + (w2 * y2) + (w3 * y3), and zO = (wl * zl) + (w2 * z2) + (w3 * z3),
wherein wl = (1/rl) / (1/rl + l/r2 + l/r3), w2 = (l/r2) / (1/rl + l/r2 + l/r3) , and w3 = (l/r3) / (1/rl + l/r2 + l/r3) .
6. A method of determining a position of a wireless device, the method including: identifying a first access point having a first known location and a predetermined radio propagation range of r, wherein the position of the wireless device is the first known location with an uncertainty of r determining whether the first access point uses multiple antennas; if so, then determining a radio signal strength indicator (RSSI) associated with each of the multiple antennas; identifying a signal path of the antenna associated with a highest RSSI; correlating the highest RSSI to a stored distance, wherein the stored distance represents a relative distance from the first access point to the wireless device; and using angles of the signal path and the relative distance to compute a coordinate position of the wireless device.
7. The method of Claim 6, wherein the angles include an angle θ, which is measured taken from an x-axis to the signal path, and an angle Φ, which is measured from the signal path to a path connecting the wireless device and the first access point .
8. The method of Claim 7, wherein the coordinate position of the wireless device is (x4, y4 , z4), wherein the relative position is r4 , and wherein using angles of the signal path and the relative position to compute the coordinate position includes using a set of equations : x4 = x5 + (r4 * cos (Φ) * cos (θ) ) , y4 = y5 + (r4 * cos (Φ) * sin(θ)), and z4 = z5 + (r4 * sin(Φ) ) .
9. (Cancelled)
10. (Cancelled)
11. (Cancelled)
12. A method of 'determining a position of a device having wireless networking capability, the method including: identifying a fixed position of an access point accessible by the device; and 37 computing the position of the device using short radio wave propagation between the access point and the device wherein computing the position includes : determining a radio signal strength indicator (RSSI) of the access point; and correlating the RSSI to a stored distance, wherein the stored distance represents a relative distance from the access point to the device; determining whether the access point uses multiple antennas ,- if so, then determining a radio signal strength indicator (RSSI) associated with each of the multiple antennas; identifying a signal path of the antenna associated with a highest RSSI; correlating the highest RSSI to a stored distance, wherein the stored distance represents a relative distance from the access point to the device; and using angles of the signal path and the relative distance to compute a coordinate position of the device.
13. The method of Claim 12 , wherein the angles include an angle θ, which is measured taken from an x-axis to the signal path, and an angle Φ, which is measured from the signal path to a path connecting the device and the access point.
14. A method of determining a position of a device having wireless networking capability, the method including: providing information from a wireless local area network (WLAN) to accelerate the determining using a global positioning system (GPS) , wherein the information includes decoded GPS data.
38 15. The method of Claim 14, wherein the information from the WLAN further includes a current time and a last position of the device, wherein the decoded GPS data, the current time, and the last position can be provided one of via and by the WLAN.
16. A method of determining a position of a device having wireless networking capability, the method including: providing information from a wireless local area network (WLAN) to facilitate the determining using a global positioning system (GPS) ; and using the information from the WLAN, computing a first G^S satellite having a highest elevation angle from a set of GPS satellites, wherein the information from the WLAN includes decoded GPS data, a current time, and a last position provided one of via and by the WLAN.
17. The method of Claim 16, further including: searching for the first GPS satellite with multiple correlators .
18. The method of Claim 17, wherein searching includes partitioning the multiple correlators into correlator pairs.
19. The method of Claim 17, wherein searching includes partitioning the multiple correlators into correlator tracking sets .
20. The method of Claim 17, wherein searching includes using a time offset and a frequency offset to find the first GPS satellite.
21. The method of Claim 20, further including: 39 deriving ti e offsets and frequency offsets for additional GPS satellites using the time offset and the frequency offset that found the first GPS satellite.
22. A method of determining a new common position of a first device and a second device, the first and second devices having wireless networking capability, the method including: exchanging information between the first device and the second device in an ad hoc communication mode, wherein the shared information includes last positions of the first and second devices and update times associated with the last positions .
23. The method of Claim 22, wherein the last positions and the update times are provided by access points previously associated with the first and second devices.
24. A method of determining a new common position of a first device and a second device, the first and second devices having wireless networking capability, the method including: exchanging information between the first device and the second device in an ad hoc communication mode, wherein the shared information includes last positions of the first and second devices and update times associated with the last positions, wherein the last positions and the update times are provided by access points previously associated with the first and second devices, wherein the first client has a last position (xll, yll, zll) , which was updated tl seconds ago, and wherein the second client has a last position (xl2, yl2, zl2) , which was updated t2 seconds ago, and further including: computing the new common position (x, y, z) using a set of equations: 40 x = wl * xll + w2 * xl2 y = wl * yll + w2 * yl2 z = wl * zll + w2 * zl2
wherein weighting factors wl and w2 are defined as : wl = (1/tl) / (1/tl + l/t2) w2 = (l/t2) / (1/tl + l/t2) .
25. A wireless local area network (WLAN) system for facilitating providing a global positioning system (GPS) position of a client, the system including: analog means for associating with the client, the analog means including a frequency synthesizer receiving one of a first signal associated with WLAN baseband operation and a second signal associated with GPS baseband operation; an analog to digital conversion means; and digital means for providing the WLAN baseband operation and the GPS baseband operation.
26. The WLAN system of Claim 25, further including: means for providing decoded GPS data to the client preceding disassociation of the client to the WLAN.
PCT/US2004/003468 2003-02-14 2004-02-06 Positioning with wireless local area networks and wlan-aided global positioning systems WO2004075458A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/367,524 2003-02-14
US10/367,524 US7130646B2 (en) 2003-02-14 2003-02-14 Positioning with wireless local area networks and WLAN-aided global positioning systems

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WO2004075458A2 WO2004075458A2 (en) 2004-09-02
WO2004075458A3 WO2004075458A3 (en) 2005-03-24
WO2004075458B1 true WO2004075458B1 (en) 2005-05-19

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WO (1) WO2004075458A2 (en)

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US10674472B2 (en) 2020-06-02
US20150304811A1 (en) 2015-10-22
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US7130646B2 (en) 2006-10-31
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US9769603B2 (en) 2017-09-19
US20200296679A1 (en) 2020-09-17
US8855685B2 (en) 2014-10-07
US9571963B2 (en) 2017-02-14
US9100786B2 (en) 2015-08-04
WO2004075458A2 (en) 2004-09-02
US7899472B1 (en) 2011-03-01
US20120076122A1 (en) 2012-03-29
US20170070849A1 (en) 2017-03-09
US10966173B2 (en) 2021-03-30
US20110025557A1 (en) 2011-02-03
US10212540B2 (en) 2019-02-19
US20140057653A1 (en) 2014-02-27
US8909252B2 (en) 2014-12-09
US20170374501A1 (en) 2017-12-28
US20190158976A1 (en) 2019-05-23
US20040162084A1 (en) 2004-08-19

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