CA2454161A1 - Improved method for estimating tdoa and fdoa in a wireless location system - Google Patents
Improved method for estimating tdoa and fdoa in a wireless location system Download PDFInfo
- Publication number
- CA2454161A1 CA2454161A1 CA002454161A CA2454161A CA2454161A1 CA 2454161 A1 CA2454161 A1 CA 2454161A1 CA 002454161 A CA002454161 A CA 002454161A CA 2454161 A CA2454161 A CA 2454161A CA 2454161 A1 CA2454161 A1 CA 2454161A1
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- Prior art keywords
- cross
- recited
- correlation
- tdoa
- value
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
-
- 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
- G01S5/10—Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements, e.g. omega or decca systems
-
- 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
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
- G01S1/022—Means for monitoring or calibrating
- G01S1/026—Means for monitoring or calibrating of associated receivers
Abstract
A method, used in locating a mobile transmitter, includes providing a set of cross-correlation values, wherein each cross-correlation value is associated with a corresponding TDOA and/or FDOA estimae and is produced by cross-correlating a reference signal with a cooperating signal (fig. 5). The reference signal comprises a copy of a signal transmitted by the mobile transmitter as received at a first antenna and the cooperating signal comprises a copy of the same signal as received at a second antenna. The method further includes determining a most likely range of TDOA and/or FDOA
estimates, and then identifying an optimal cross-correlation value within a subset of cross-correlation values (fig. 10) corresponding to the most likely range of TDOA and/or FDOA estimates. The TDOA and/or FDOA value corresponding to the optimal cross-correlation value is then employed in calculating the location of the mobile transmitter.
estimates, and then identifying an optimal cross-correlation value within a subset of cross-correlation values (fig. 10) corresponding to the most likely range of TDOA and/or FDOA estimates. The TDOA and/or FDOA value corresponding to the optimal cross-correlation value is then employed in calculating the location of the mobile transmitter.
Claims (43)
1. A method used in locating a mobile transmitter for improving a time difference of arrival (TDOA) estimate produced by cross-correlating a reference signal with a cooperating signal, using either a time-domain cross-correlation or frequency-domain cross-spectrum process, wherein the reference signal is a copy of a first signal transmitted by the mobile transmitter as received at a first antenna and the cooperating signal is a copy of the first signal transmitted by the mobile transmitter as received at a second antenna, comprising the steps of a. determining a most likely range of TDOA estimates;
b. searching the cross-correlation results only within the most likely range of TDOA estimates; and c. estimating the TDOA to be the value within the most likely range that is associated with an optimal value of the magnitude of the cross-correlation.
b. searching the cross-correlation results only within the most likely range of TDOA estimates; and c. estimating the TDOA to be the value within the most likely range that is associated with an optimal value of the magnitude of the cross-correlation.
2. A method as recited in claim l, wherein the most likely range of TDOA
estimates is limited to time values associated with the distance between the first antenna at which the reference signal was received and the second antenna at which the cooperating signal was received, plus a predetermined error value.
estimates is limited to time values associated with the distance between the first antenna at which the reference signal was received and the second antenna at which the cooperating signal was received, plus a predetermined error value.
3. A method as recited in claim 1, wherein the most likely range of TDOA
estimates is determined as corresponding to only an area in which the mobile transmitter is a priori known to be located.
estimates is determined as corresponding to only an area in which the mobile transmitter is a priori known to be located.
4. A method as recited in claim 1, wherein the optimal value is the highest magnitude peak of the time-domain cross-correlation or equivalent frequency-domain cross-spectrum process.
5. A method as recited in claim 1, wherein the optimal value is the earliest point in time when the magnitude of the time-domain cross-correlation or equivalent frequency-domain cross spectrum process is no less than a predetermined proportion of the highest magnitude peak of the time-domain cross-correlation or equivalent frequency-domain cross-spectrum process.
6. A method as recited in claim 1, wherein the optimal value is the earliest point in time when the magnitude of the time-domain cross-correlation or equivalent frequency-domain cross-spectrum process is no less than a predetermined proportion of the average noise level.
7. A method as recited in claim 1, wherein the mostly like range of TDOA
estimates is further limited so as to correspond to an area within a predetermined distance from the first antenna receiving the reference signal.
estimates is further limited so as to correspond to an area within a predetermined distance from the first antenna receiving the reference signal.
8. A method as recited in claim 1, wherein the mostly like range of TDOA
estimates is further limited so as to correspond to an area within a predetermined distance from the second antenna receiving the cooperating signal.
estimates is further limited so as to correspond to an area within a predetermined distance from the second antenna receiving the cooperating signal.
9. A method as recited in claims 7 or 8, wherein the predetermined distance is determined using a round trip delay measurement.
10. A method as recited in claims 7 or 8, wherein the predetermined distance is determined by measuring the received power of the mobile phone at the first and second antennas.
11. A method used in locating a mobile transmitter for improving a time difference of arrival (TDOA) estimate produced by cross-correlating a reference signal with a cooperating signal, using either a time-domain cross-correlation or equivalent frequency-domain cross-spectrum process, wherein either process requires the simultaneous solution of both frequency difference of arrival (FDOA) and TDOA, wherein the reference signal is a copy of a first signal transmitted by the mobile transmitter as received at a first antenna and the cooperating signal is a copy of the first signal transmitted by the mobile transmitter as received at a second antenna, comprising the steps of:
a. determining a most likely range of FDOA estimates;
b. determining a most likely range of TDOA estimates;
c. searching the cross-correlation results only within the most likely range of TDOA and FDOA estimates;
d. estimating the TDOA to be the value within the most likely range that is associated with an optimal value of the magnitude of the cross-correlation.
a. determining a most likely range of FDOA estimates;
b. determining a most likely range of TDOA estimates;
c. searching the cross-correlation results only within the most likely range of TDOA and FDOA estimates;
d. estimating the TDOA to be the value within the most likely range that is associated with an optimal value of the magnitude of the cross-correlation.
12. A method as recited in claim 11, wherein the most likely range of FDOA
estimates is limited to the frequency values associated with a stationary or nearly stationary mobile transmitter.
estimates is limited to the frequency values associated with a stationary or nearly stationary mobile transmitter.
13. A method as recited in claims 11 or 12, wherein the most likely range of TDOA
estimates is limited to time values associated with the distance between the first antenna at which the reference signal was received and the second antenna at which the cooperating signal was received, plus a predetermined error value.
estimates is limited to time values associated with the distance between the first antenna at which the reference signal was received and the second antenna at which the cooperating signal was received, plus a predetermined error value.
14. A method as recited in claims 11 or 12, wherein the optimal value is the highest magnitude peak of the time-domain cross-correlation or equivalent frequency domain cross spectrum process.
15. A method as recited in claims 11 or 12, wherein the optimal value is the earliest point in time when the magnitude of the time-domain cross-correlation or equivalent frequency-domain cross spectrum process is no less than a predetermined proportion of the highest magnitude peak of the time-domain cross-correlation or equivalent frequency-domain cross spectrum process.
16. A method as recited in claims 11 or 12, wherein the optimal value is the earliest point in time when the magnitude of the time-domain cross-correlation or equivalent frequency-domain cross spectrum process is no less than a predetermined proportion of the average noise level.
17. A method as recited in claim 12, wherein the mostly like range of TDOA
estimates is further limited so as to correspond to an area within a predetermined distance from the first antenna receiving the reference signal.
estimates is further limited so as to correspond to an area within a predetermined distance from the first antenna receiving the reference signal.
18. A method as recited in claim 12, wherein the mostly like range of TDOA
estimates is further limited so as to correspond to an area within a predetermined distance from the second antenna receiving the cooperating signal.
estimates is further limited so as to correspond to an area within a predetermined distance from the second antenna receiving the cooperating signal.
19. A method as recited in claims 17 or 18, wherein the predetermined distance is determined using a round trip delay measurement.
20. A method as recited in claims 17 or 18, wherein the predetermined distance is determined by measuring the received power of the mobile phone at the first and second antennas.
21. A method used in locating a mobile transmitter, comprising:
a. providing a set of cross-correlation values, wherein each cross-correlation value is associated with a corresponding TDOA and/or FDOA estimate and is produced by cross-correlating a reference signal with a cooperating signal, the reference signal comprising a copy of a signal transmitted by the mobile transmitter as received at a first antenna and the cooperating signal comprising a copy of the signal transmitted by the mobile transmitter as received at a second antenna;
b. determining a most likely range of TDOA and/or FDOA estimates;
c. identifying an optimal cross-correlation value within a subset of cross-correlation values corresponding to the most likely range of TDOA and/or FDOA estimates; and d. employing the TDOA and/or FDOA value corresponding to the optimal cross-correlation value in calculating the location of the mobile transmitter.
a. providing a set of cross-correlation values, wherein each cross-correlation value is associated with a corresponding TDOA and/or FDOA estimate and is produced by cross-correlating a reference signal with a cooperating signal, the reference signal comprising a copy of a signal transmitted by the mobile transmitter as received at a first antenna and the cooperating signal comprising a copy of the signal transmitted by the mobile transmitter as received at a second antenna;
b. determining a most likely range of TDOA and/or FDOA estimates;
c. identifying an optimal cross-correlation value within a subset of cross-correlation values corresponding to the most likely range of TDOA and/or FDOA estimates; and d. employing the TDOA and/or FDOA value corresponding to the optimal cross-correlation value in calculating the location of the mobile transmitter.
22. A method as recited in claim 21, wherein the cross-correlating comprises cross-correlating in the time-domain.
23. A method as recited in claim 21, wherein the cross-correlating comprises cross-correlating in the frequency-domain.
24. A method as recited in claim 21, wherein the most likely range of TDOA
estimates is based upon a rough estimate of the location of the mobile transmitter.
estimates is based upon a rough estimate of the location of the mobile transmitter.
25. A method as recited in claim 21, wherein the most likely range of FDOA
estimates is based upon a rough estimate of the speed of the mobile transmitter.
estimates is based upon a rough estimate of the speed of the mobile transmitter.
26. A method as recited in claim 24, wherein the rough estimate is based at least in part on the distance between the first and second antennas.
27. A method as recited in claim 26, wherein the rough estimate is further based on a predetermined error value.
28. A method as recited in claim 24, wherein the rough estimate is based on an area in which the mobile transmitter is a priori known to be located.
29. A method as recited in claim 21, wherein the cross-correlation value having the largest peak magnitude within said subset of cross-correlation values is identified as the optimal cross-correlation value.
30. A method as recited in claim 21, comprising identifying, as the optimal cross-correlation value, the value within said subset of cross-correlation values having the smallest associated TDOA estimate for which the magnitude is no less than a predetermined proportion of the largest peak magnitude.
31. A method as recited in claim 21, comprising identifying, as the optimal cross-correlation value, the value within said subset of cross-correlation values having the smallest associated TDOA estimate for which the magnitude is no less than a predetermined proportion of an average noise level.
32. A method as recited in claim 24, wherein the rough estimate is based on an area within a predetermined distance from the first antenna.
33. A method as recited in claim 24, wherein the rough estimate is based on an area within a predetermined distance from the second antenna.
34. A method as recited in claims 32 or 33, wherein the predetermined distance is determined using a round trip delay measurement.
35. A method as recited in claims 32 or 33, wherein the predetermined distance is determined by measuring the received power of the mobile transmitter at the first and second antennas.
36. A Wireless Location System (WLS) for locating a mobile transmitter, comprising:
a. means for determining a most likely range of TDOA and/or FDOA
estimates; and b. means for identifying an optimal cross-correlation value within a subset of cross-correlation values corresponding to the most likely range of TDOA and/or FDOA estimates, said subset of cross-correlation values being contained within a set of cross-correlation values, wherein each cross-correlation value in the set is associated with a corresponding TDOA and/or FDOA estimate.
a. means for determining a most likely range of TDOA and/or FDOA
estimates; and b. means for identifying an optimal cross-correlation value within a subset of cross-correlation values corresponding to the most likely range of TDOA and/or FDOA estimates, said subset of cross-correlation values being contained within a set of cross-correlation values, wherein each cross-correlation value in the set is associated with a corresponding TDOA and/or FDOA estimate.
37. A system as recited in claim 36, wherein each value in said set of cross-correlation values and is representative of a cross-correlation, in the time or frequency domain, of a reference signal with a cooperating signal.
38. A system as recited in claim 37, wherein the reference signal comprises a copy of a signal transmitted by the mobile transmitter as received at a first antenna and the cooperating signal comprises a copy of the signal transmitted by the mobile transmitter as received at a second antenna.
39. A system as recited in claim 36, further comprising means for employing the TDOA and/or FDOA value corresponding to the optimal cross-correlation value in calculating the location of the mobile transmitter.
40. A method for use in a Wireless Location System (WLS) for locating a mobile transmitter, comprising:
a. determining a most likely range of TDOA and/or FDOA estimates; and b. identifying an optimal cross-correlation value within a subset of cross-correlation values corresponding to the most likely range of TDOA and/or FDOA estimates, said subset of cross-correlation values being contained within a set of cross-correlation values, wherein each cross-correlation value in the set is associated with a corresponding TDOA and/or FDOA
estimate.
a. determining a most likely range of TDOA and/or FDOA estimates; and b. identifying an optimal cross-correlation value within a subset of cross-correlation values corresponding to the most likely range of TDOA and/or FDOA estimates, said subset of cross-correlation values being contained within a set of cross-correlation values, wherein each cross-correlation value in the set is associated with a corresponding TDOA and/or FDOA
estimate.
41. A method as recited in claim 40, wherein each value in said set of cross-correlation values and is representative of a cross-correlation, in the time or frequency domain, of a reference signal with a cooperating signal.
42. A system as recited in claim 41, wherein the reference signal comprises a copy of a signal transmitted by the mobile transmitter as received at a first antenna and the cooperating signal comprises a copy of the signal transmitted by the mobile transmitter as received at a second antenna.
43. A system as recited in claim 40, further comprising employing the TDOA
and/or FDOA value corresponding to the optimal cross-correlation value in calculating the location of the mobile transmitter.
and/or FDOA value corresponding to the optimal cross-correlation value in calculating the location of the mobile transmitter.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/908,998 US6876859B2 (en) | 2001-07-18 | 2001-07-18 | Method for estimating TDOA and FDOA in a wireless location system |
US09/908,998 | 2001-07-18 | ||
PCT/US2002/000754 WO2003009613A1 (en) | 2001-07-18 | 2002-01-10 | Improved method for estimating tdoa and fdoa in a wireless location system |
Publications (2)
Publication Number | Publication Date |
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CA2454161A1 true CA2454161A1 (en) | 2003-01-30 |
CA2454161C CA2454161C (en) | 2011-03-15 |
Family
ID=25426487
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2454161A Expired - Lifetime CA2454161C (en) | 2001-07-18 | 2002-01-10 | Improved method for estimating tdoa and fdoa in a wireless location system |
Country Status (13)
Country | Link |
---|---|
US (1) | US6876859B2 (en) |
EP (1) | EP1417847B1 (en) |
JP (3) | JP2004536533A (en) |
KR (1) | KR100881946B1 (en) |
CN (1) | CN100397911C (en) |
AT (1) | ATE546975T1 (en) |
BR (1) | BR0210360A (en) |
CA (1) | CA2454161C (en) |
ES (1) | ES2386669T3 (en) |
GB (1) | GB2395080B (en) |
IL (2) | IL159413A0 (en) |
MX (1) | MXPA04000461A (en) |
WO (1) | WO2003009613A1 (en) |
Families Citing this family (198)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7548787B2 (en) | 2005-08-03 | 2009-06-16 | Kamilo Feher | Medical diagnostic and communication system |
US7415066B2 (en) * | 1998-08-10 | 2008-08-19 | Kamilo Feher | Mis-matched modulation-demodulation format selectable filters |
US8050345B1 (en) * | 1999-08-09 | 2011-11-01 | Kamilo Feher | QAM and GMSK systems |
US7593481B2 (en) * | 1998-08-31 | 2009-09-22 | Kamilo Feher | CDMA, W-CDMA, 3rd generation interoperable modem format selectable (MFS) systems with GMSK modulated systems |
US6757334B1 (en) * | 1998-08-10 | 2004-06-29 | Kamilo Feher | Bit rate agile third-generation wireless CDMA, GSM, TDMA and OFDM system |
US7079584B2 (en) * | 1998-08-10 | 2006-07-18 | Kamilo Feher | OFDM, CDMA, spread spectrum, TDMA, cross-correlated and filtered modulation |
AU5796499A (en) | 1998-08-31 | 2000-03-21 | Kamilo Feher | Feher keying (fk) modulation and transceivers including clock shaping processors |
US7889133B2 (en) | 1999-03-05 | 2011-02-15 | Itt Manufacturing Enterprises, Inc. | Multilateration enhancements for noise and operations management |
US8203486B1 (en) | 1999-03-05 | 2012-06-19 | Omnipol A.S. | Transmitter independent techniques to extend the performance of passive coherent location |
US7739167B2 (en) | 1999-03-05 | 2010-06-15 | Era Systems Corporation | Automated management of airport revenues |
US7570214B2 (en) | 1999-03-05 | 2009-08-04 | Era Systems, Inc. | Method and apparatus for ADS-B validation, active and passive multilateration, and elliptical surviellance |
US7782256B2 (en) | 1999-03-05 | 2010-08-24 | Era Systems Corporation | Enhanced passive coherent location techniques to track and identify UAVs, UCAVs, MAVs, and other objects |
US7908077B2 (en) | 2003-06-10 | 2011-03-15 | Itt Manufacturing Enterprises, Inc. | Land use compatibility planning software |
US7667647B2 (en) | 1999-03-05 | 2010-02-23 | Era Systems Corporation | Extension of aircraft tracking and positive identification from movement areas into non-movement areas |
US8446321B2 (en) | 1999-03-05 | 2013-05-21 | Omnipol A.S. | Deployable intelligence and tracking system for homeland security and search and rescue |
US7777675B2 (en) | 1999-03-05 | 2010-08-17 | Era Systems Corporation | Deployable passive broadband aircraft tracking |
US9373251B2 (en) | 1999-08-09 | 2016-06-21 | Kamilo Feher | Base station devices and automobile wireless communication systems |
US9813270B2 (en) | 1999-08-09 | 2017-11-07 | Kamilo Feher | Heart rate sensor and medical diagnostics wireless devices |
US9307407B1 (en) | 1999-08-09 | 2016-04-05 | Kamilo Feher | DNA and fingerprint authentication of mobile devices |
US7260369B2 (en) * | 2005-08-03 | 2007-08-21 | Kamilo Feher | Location finder, tracker, communication and remote control system |
US7428510B2 (en) | 2000-02-25 | 2008-09-23 | Telecommunication Systems, Inc. | Prepaid short messaging |
US7522911B2 (en) * | 2000-04-11 | 2009-04-21 | Telecommunication Systems, Inc. | Wireless chat automatic status tracking |
US7110773B1 (en) * | 2000-04-11 | 2006-09-19 | Telecommunication Systems, Inc. | Mobile activity status tracker |
US7853272B2 (en) * | 2001-12-21 | 2010-12-14 | Telecommunication Systems, Inc. | Wireless network tour guide |
US6823284B2 (en) * | 2002-04-30 | 2004-11-23 | International Business Machines Corporation | Geolocation subsystem |
US20040029545A1 (en) * | 2002-08-09 | 2004-02-12 | Anderson Jon J. | Method and system for leaving a communication channel in a wireless communications system |
US7715850B2 (en) * | 2002-10-22 | 2010-05-11 | Qualcomm Incorporated | Method and apparatus for identifying transmitters in a wireless communication system using power predictions |
JP2004175052A (en) * | 2002-11-29 | 2004-06-24 | Sony Corp | Medium to be recorded by ink jetting, ink jet imaging method, and printed matter |
WO2004052039A1 (en) * | 2002-12-02 | 2004-06-17 | Nokia Corporation | Estimation of a signal delay |
DE50307643D1 (en) * | 2003-02-07 | 2007-08-23 | Siemens Ag | Method for determining the position of a subscriber in a radio communication system |
CN100362365C (en) * | 2003-02-07 | 2008-01-16 | 西门子公司 | Method for finding the position of a subscriber in a radio communications system |
FR2857102B1 (en) * | 2003-07-04 | 2007-06-15 | Nortel Networks Ltd | METHOD FOR MEASURING THE RECEIVING TIME OF A RECEIVED RADIO SIGNAL, MEASURING DEVICE AND DEVICE FOR LOCATING A MOBILE STATION FOR CARRYING OUT THE METHOD |
US7170441B2 (en) * | 2003-08-14 | 2007-01-30 | Sensis Corporation | Target localization using TDOA distributed antenna |
GB0327041D0 (en) * | 2003-11-21 | 2003-12-24 | Roke Manor Research | Apparatus and methods |
GB0327794D0 (en) * | 2003-11-29 | 2003-12-31 | Koninkl Philips Electronics Nv | Positioning method and apparatus |
GB0328202D0 (en) | 2003-12-05 | 2004-01-07 | Westinghouse Brake & Signal | Railway vehicle detection |
US7627333B2 (en) * | 2003-12-19 | 2009-12-01 | Andrew Llc | E-OTD augmentation to U-TDOA location system |
US7440762B2 (en) * | 2003-12-30 | 2008-10-21 | Trueposition, Inc. | TDOA/GPS hybrid wireless location system |
GB0401767D0 (en) * | 2004-01-27 | 2004-03-03 | Koninkl Philips Electronics Nv | Positioning systems |
US7409189B2 (en) * | 2004-03-30 | 2008-08-05 | Intel Corporation | Calibration and testing architecture for receivers |
US7570696B2 (en) * | 2004-06-25 | 2009-08-04 | Intel Corporation | Multiple input multiple output multicarrier communication system and methods with quantized beamforming feedback |
US7292189B2 (en) * | 2004-09-10 | 2007-11-06 | Worcester Polytechnic Institute | Methods and apparatus for high resolution positioning |
US7359449B2 (en) * | 2004-10-05 | 2008-04-15 | Kamilo Feher | Data communication for wired and wireless communication |
US7421004B2 (en) * | 2004-10-05 | 2008-09-02 | Kamilo Feher | Broadband, ultra wideband and ultra narrowband reconfigurable interoperable systems |
US7453961B1 (en) | 2005-01-11 | 2008-11-18 | Itt Manufacturing Enterprises, Inc. | Methods and apparatus for detection of signal timing |
JP4736083B2 (en) * | 2005-02-21 | 2011-07-27 | 独立行政法人電子航法研究所 | Method for positioning mobile body and positioning device therefor |
US20060217944A1 (en) * | 2005-03-11 | 2006-09-28 | Newfield Wireless, Inc. | Methods for accurate use of finite dynamic range measurement data in radio path loss propagation model calibration |
US7427952B2 (en) * | 2005-04-08 | 2008-09-23 | Trueposition, Inc. | Augmentation of commercial wireless location system (WLS) with moving and/or airborne sensors for enhanced location accuracy and use of real-time overhead imagery for identification of wireless device locations |
US7869810B2 (en) * | 2005-04-25 | 2011-01-11 | Agilent Technologies, Inc. | Method and system for computing and displaying location information from cross-correlation data |
EP1882374A4 (en) | 2005-05-17 | 2008-05-21 | Andrew Corp | Method and apparatus for determining coupled path loss |
JP4592506B2 (en) * | 2005-06-15 | 2010-12-01 | 株式会社東芝 | Uplink interference source locating apparatus and method |
US10009956B1 (en) | 2017-09-02 | 2018-06-26 | Kamilo Feher | OFDM, 3G and 4G cellular multimode systems and wireless mobile networks |
US7280810B2 (en) * | 2005-08-03 | 2007-10-09 | Kamilo Feher | Multimode communication system |
US7295156B2 (en) * | 2005-08-08 | 2007-11-13 | Trimble Navigation Limited | Cellphone GPS positioning system |
US7283091B1 (en) | 2005-08-08 | 2007-10-16 | Trimble Navigation Limited | Radio positioning system for providing position and time for assisting GPS signal acquisition in mobile unit |
US20070066309A1 (en) * | 2005-09-20 | 2007-03-22 | Elizabeth Countryman | Prepaid call management in intelligent network |
US7489937B2 (en) * | 2005-12-22 | 2009-02-10 | L-3 Communications Integrated Systems, L.P. | Method and apparatus for detecting emitter movement |
US7593738B2 (en) * | 2005-12-29 | 2009-09-22 | Trueposition, Inc. | GPS synchronization for wireless communications stations |
US20090005061A1 (en) * | 2005-12-30 | 2009-01-01 | Trueposition, Inc. | Location quality of service indicator |
US20070155489A1 (en) * | 2005-12-30 | 2007-07-05 | Frederic Beckley | Device and network enabled geo-fencing for area sensitive gaming enablement |
US8588220B2 (en) * | 2005-12-30 | 2013-11-19 | L-3 Communications Corporation | Method and apparatus for mitigating port swapping during signal tracking |
US8150421B2 (en) | 2005-12-30 | 2012-04-03 | Trueposition, Inc. | User plane uplink time difference of arrival (U-TDOA) |
US8768343B2 (en) | 2006-03-31 | 2014-07-01 | Zebra Enterprise Solutions Corp | Wireless local area network receiver and associated method |
US7570212B2 (en) | 2006-04-07 | 2009-08-04 | The Boeing Company | Reference beacon methods and apparatus for TDOA/FDOA geolocation |
US7411548B2 (en) * | 2006-04-12 | 2008-08-12 | The Boeing Company | Reference beacon identification using transmission sequence characteristics |
US8892065B2 (en) * | 2006-04-26 | 2014-11-18 | Zebra Enterprise Solutions Corp. | Method, apparatus, and computer program product for wireless signal storage with signal recognition detection triggering |
US9362976B2 (en) | 2006-04-26 | 2016-06-07 | Zih Corp. | Wireless local area network system and receiver adapted for use thereof and associated method |
US7965227B2 (en) | 2006-05-08 | 2011-06-21 | Era Systems, Inc. | Aircraft tracking using low cost tagging as a discriminator |
US8000702B2 (en) * | 2006-05-16 | 2011-08-16 | Andrew, Llc | Optimizing location services performance by combining user plane and control plane architectures |
US8019339B2 (en) | 2006-05-16 | 2011-09-13 | Andrew Llc | Using serving area identification in a mixed access network environment |
US8000701B2 (en) | 2006-05-16 | 2011-08-16 | Andrew, Llc | Correlation mechanism to communicate in a dual-plane architecture |
US8335196B2 (en) * | 2006-09-19 | 2012-12-18 | Qualcomm Incorporated | Accommodating wideband and narrowband communication devices |
US8103293B2 (en) | 2006-10-17 | 2012-01-24 | Itt Manufacturing Enterprises, Inc. | System and related circuits and methods for detecting and locating wireless communication device use within a geographical area or facility |
US7974235B2 (en) | 2006-11-13 | 2011-07-05 | Telecommunication Systems, Inc. | Secure location session manager |
WO2008097694A1 (en) * | 2007-02-05 | 2008-08-14 | Andrew Corporation | System and method for optimizing location estimate of mobile unit |
US7667640B2 (en) * | 2007-04-13 | 2010-02-23 | Glowlink Communications Technology, Inc. | Determining a geolocation solution of an emitter on earth using satellite signals |
US7663547B2 (en) * | 2007-04-13 | 2010-02-16 | Glowlink Communications Technology, Inc. | Determining a geolocation solution of an emitter on earth based on weighted least-squares estimation |
US8331953B2 (en) * | 2007-05-01 | 2012-12-11 | Andrew Llc | System and method for estimating the location of a mobile device |
US20080285505A1 (en) * | 2007-05-15 | 2008-11-20 | Andrew Corporation | System and method for network timing recovery in communications networks |
US7933610B2 (en) * | 2007-05-21 | 2011-04-26 | Andrew Llc | Method and apparatus to select an optimum site and/or sector to provide geo-location data |
US20100278335A1 (en) * | 2007-11-02 | 2010-11-04 | Per Enge | Arrangements for Location-Based Security Systems and Methods Therefor |
US8170585B2 (en) * | 2007-11-14 | 2012-05-01 | Andrew, Llc | Ranging in UMTS networks |
US8447319B2 (en) * | 2007-11-15 | 2013-05-21 | Andrew Llc | System and method for locating UMTS user equipment using measurement reports |
US7800530B2 (en) * | 2007-12-07 | 2010-09-21 | Andrew, Llc | Method and system for providing assistance data for A-GPS location of handsets in wireless networks |
US7667649B2 (en) * | 2007-12-10 | 2010-02-23 | Trueposition, Inc. | Detection of time of arrival of CDMA signals in a wireless location system |
US8213955B2 (en) | 2008-05-01 | 2012-07-03 | Andrew, Llc | Network measurement report caching for location of mobile devices |
US8098590B2 (en) * | 2008-06-13 | 2012-01-17 | Qualcomm Incorporated | Apparatus and method for generating performance measurements in wireless networks |
KR101495289B1 (en) * | 2008-07-03 | 2015-02-25 | 삼성전자주식회사 | Apparatus and method for resource allocation for frequency overlay scheme in a broadband wireless communication system |
US20100033379A1 (en) * | 2008-08-11 | 2010-02-11 | Lommen Layne D | Reference beacon identification using transmission sequence characteristics |
US7924224B2 (en) | 2008-08-15 | 2011-04-12 | Trueposition, Inc. | Variable coherence integration for the location of weak signals |
US8136240B2 (en) * | 2008-08-19 | 2012-03-20 | International Business Machines Corporation | Method of forming a substrate having a plurality of insulator layers |
US8532747B2 (en) * | 2008-08-22 | 2013-09-10 | Devicor Medical Products, Inc. | Biopsy marker delivery device |
US8325661B2 (en) * | 2008-08-28 | 2012-12-04 | Qualcomm Incorporated | Supporting multiple access technologies in a wireless environment |
US9035829B2 (en) | 2008-09-10 | 2015-05-19 | Nextnav, Llc | Wide area positioning systems and methods |
US9057606B2 (en) | 2009-09-10 | 2015-06-16 | Nextnav, Llc | Wide area positioning system |
US8917209B2 (en) | 2009-09-10 | 2014-12-23 | Nextnav, Llc | Coding in a wide area positioning system (WAPS) |
CA2736768A1 (en) * | 2008-09-10 | 2010-03-18 | Commlabs, Inc. | Wide area positioning system |
US8954028B2 (en) | 2008-09-25 | 2015-02-10 | Telecommunication Systems, Inc. | Geo-redundant and high reliability commercial mobile alert system (CMAS) |
US8073463B2 (en) | 2008-10-06 | 2011-12-06 | Andrew, Llc | System and method of UMTS UE location using uplink dedicated physical control channel and downlink synchronization channel |
US8762519B2 (en) * | 2008-10-28 | 2014-06-24 | Andrew Llc | System and method for providing location services for multiple access networks from a single location server |
US8125377B2 (en) * | 2008-11-17 | 2012-02-28 | Andrew Llc | System and method for determining the location of a mobile device |
US7800533B2 (en) * | 2008-11-24 | 2010-09-21 | Andrew, Llc | System and method for determining falsified geographic location of a mobile device |
US8035557B2 (en) * | 2008-11-24 | 2011-10-11 | Andrew, Llc | System and method for server side detection of falsified satellite measurements |
US7940213B2 (en) * | 2008-11-24 | 2011-05-10 | Andrew, Llc | System and method for determining falsified satellite measurements |
US8160609B2 (en) * | 2008-11-26 | 2012-04-17 | Andrew Llc | System and method for multiple range estimation location |
US8380222B2 (en) | 2008-11-26 | 2013-02-19 | Andrew Llc | System and method for multiple range estimation location |
US8249622B2 (en) | 2008-11-26 | 2012-08-21 | Andrew, Llc | System and method for multiple range estimation location |
US7956803B2 (en) | 2008-12-01 | 2011-06-07 | Andrew, Llc | System and method for protecting against spoofed A-GNSS measurement data |
US7916071B2 (en) * | 2008-12-23 | 2011-03-29 | Andrew, Llc | System and method for determining a reference location of a mobile device |
US8436768B2 (en) | 2008-12-30 | 2013-05-07 | Trueposition, Inc. | Diversity time and frequency location receiver |
US8138975B2 (en) * | 2008-12-30 | 2012-03-20 | Trueposition, Inc. | Interference detection, characterization and location in a wireless communications or broadcast system |
ES2729416T3 (en) | 2009-03-04 | 2019-11-04 | Nokia Corp | Position monitoring for a coverage area |
US7986266B2 (en) | 2009-03-13 | 2011-07-26 | Andrew, Llc | Method and system for selecting optimal satellites in view |
US20100234022A1 (en) * | 2009-03-16 | 2010-09-16 | Andrew Llc | System and method for supl roaming in wimax networks |
US8239483B2 (en) | 2009-03-16 | 2012-08-07 | Andrew, Llc | System and method for generic application of location determination for network attached devices |
US8301160B2 (en) * | 2009-03-16 | 2012-10-30 | Andrew Llc | System and method for SUPL roaming using a held client |
US8391884B2 (en) * | 2009-03-26 | 2013-03-05 | Andrew Llc | System and method for managing created location contexts in a location server |
US8462769B2 (en) | 2009-03-26 | 2013-06-11 | Andrew Llc | System and method for managing created location contexts in a location server |
US8467805B2 (en) * | 2009-05-08 | 2013-06-18 | Andrew Llc | System and method for determining a reference location using cell table data mining |
US8265546B2 (en) | 2009-05-11 | 2012-09-11 | Qualcomm Incorporated | Gain adjustment stepping control in a wireless repeater |
US8290510B2 (en) * | 2009-06-11 | 2012-10-16 | Andrew Llc | System and method for SUPL held interworking |
US8134493B2 (en) * | 2009-07-02 | 2012-03-13 | Raytheon Company | System and method for precision geolocation utilizing multiple sensing modalities |
IL200158A (en) | 2009-07-30 | 2014-12-31 | Verint Systems Ltd | Systems and methods for locating communication terminals in cellular networks |
EP2462461A1 (en) | 2009-08-05 | 2012-06-13 | Andrew LLC | System and method for hybrid location in an lte network |
US8248997B2 (en) * | 2009-08-17 | 2012-08-21 | Nokia Corporation | Apparatus and method for positioning a wireless user equipment |
US9291712B2 (en) | 2009-09-10 | 2016-03-22 | Nextnav, Llc | Cell organization and transmission schemes in a wide area positioning system (WAPS) |
US9372266B2 (en) | 2009-09-10 | 2016-06-21 | Nextnav, Llc | Cell organization and transmission schemes in a wide area positioning system (WAPS) |
US8340683B2 (en) | 2009-09-21 | 2012-12-25 | Andrew, Llc | System and method for a high throughput GSM location solution |
KR101047927B1 (en) | 2009-09-23 | 2011-07-08 | (주)에이알테크놀로지 | Method and apparatus for estimating arrival time difference and arrival frequency difference |
US8217832B2 (en) | 2009-09-23 | 2012-07-10 | Andrew, Llc | Enhancing location accuracy using multiple satellite measurements based on environment |
CN101699915B (en) * | 2009-10-13 | 2015-01-28 | 中兴通讯股份有限公司 | Mainboard, method for realizing network locking/ card locking function and mobile terminal |
US8188920B2 (en) * | 2009-10-15 | 2012-05-29 | Andrew, Llc | Location measurement acquisition optimization with Monte Carlo simulation |
US8289210B2 (en) * | 2009-10-15 | 2012-10-16 | Andrew Llc | Location measurement acquisition adaptive optimization |
US8233911B2 (en) * | 2009-12-16 | 2012-07-31 | Nokia Corporation | Method and apparatus for estimating a position of a node in a communications network |
US8442538B2 (en) | 2009-12-29 | 2013-05-14 | Trueposition, Inc. | Cooperating receiver selection for UMTS wireless location |
US8290496B2 (en) | 2009-12-29 | 2012-10-16 | Trueposition, Inc. | Cooperating receiver selection for UMTS wireless location |
US9331798B2 (en) * | 2010-01-08 | 2016-05-03 | Commscope Technologies Llc | System and method for mobile location by proximity detection |
US8473287B2 (en) | 2010-04-19 | 2013-06-25 | Audience, Inc. | Method for jointly optimizing noise reduction and voice quality in a mono or multi-microphone system |
US8606571B1 (en) * | 2010-04-19 | 2013-12-10 | Audience, Inc. | Spatial selectivity noise reduction tradeoff for multi-microphone systems |
US8538035B2 (en) | 2010-04-29 | 2013-09-17 | Audience, Inc. | Multi-microphone robust noise suppression |
US8781137B1 (en) | 2010-04-27 | 2014-07-15 | Audience, Inc. | Wind noise detection and suppression |
US8718673B2 (en) | 2010-05-21 | 2014-05-06 | Maple Acquisition Llc | System and method for location assurance of a mobile device |
US8447596B2 (en) | 2010-07-12 | 2013-05-21 | Audience, Inc. | Monaural noise suppression based on computational auditory scene analysis |
CN101915928B (en) * | 2010-07-14 | 2013-10-30 | 中国电子科技集团公司第十研究所 | Method and device for double-star time difference/frequency difference combined positioning |
US8958754B2 (en) | 2010-09-29 | 2015-02-17 | Andrew, Llc | System and method for sub-coherent integration for geo-location using weak or intermittent signals |
US9844079B1 (en) * | 2010-10-27 | 2017-12-12 | Keysight Technologies, Inc. | Method and system of triggering signal analysis combining time and frequency domain trigger criteria |
US8489122B2 (en) | 2010-12-09 | 2013-07-16 | Andrew Llc | System and method for total flight time ratio pattern matching |
US9191520B2 (en) | 2010-12-13 | 2015-11-17 | Telecommunication Systems, Inc. | Location services gateway server |
US8384595B2 (en) | 2010-12-16 | 2013-02-26 | Trueposition, Inc. | Position estimation through iterative inclusion of measurement data |
US8526968B2 (en) | 2011-02-14 | 2013-09-03 | Andrew Llc | System and method for mobile location by dynamic clustering |
US9007262B1 (en) * | 2011-05-25 | 2015-04-14 | Leidos, Inc. | Diversified doppler for single platform geolocation |
CN102455423B (en) * | 2011-05-31 | 2013-04-17 | 吉林大学 | Method for eliminating sound reflection interference in ultrasonic location |
CN102208951B (en) * | 2011-05-31 | 2013-07-03 | 吉林大学 | Method for eliminating acoustic radiation interferences in ultrasonic positioning |
US9715001B2 (en) | 2011-06-13 | 2017-07-25 | Commscope Technologies Llc | Mobile location in a remote radio head environment |
US9176217B2 (en) | 2011-08-02 | 2015-11-03 | Nextnav, Llc | Cell organization and transmission schemes in a wide area positioning system (WAPS) |
US8929854B2 (en) | 2011-10-27 | 2015-01-06 | Telecommunication Systems, Inc. | Emergency text messaging |
CN102508200B (en) * | 2011-11-16 | 2013-09-18 | 东南大学 | Plural spread spectrum signal TDOA (time difference of arrival) measuring method |
US8922430B2 (en) | 2011-12-22 | 2014-12-30 | Trueposition, Inc. | Optimization of variable coherence integration for the location of weak signals |
US9423508B2 (en) | 2012-01-12 | 2016-08-23 | Commscope Technologies Llc | Autonomous Transmit Chain Delay Measurements |
US8897813B2 (en) | 2012-02-03 | 2014-11-25 | Andrew Llc | LTE user equipment positioning system and method |
CA2874771A1 (en) | 2012-06-05 | 2013-12-12 | Nextnav, Llc | Systems and methods for location positioning of user device |
US9286490B2 (en) | 2013-09-10 | 2016-03-15 | Nextnav, Llc | Systems and methods for providing conditional access to transmitted information |
US9390279B2 (en) | 2012-09-11 | 2016-07-12 | Nextnav, Llc | Systems and methods for providing conditional access to transmitted information |
CN102914764A (en) * | 2012-11-24 | 2013-02-06 | 中国人民解放军总参谋部第五十七研究所 | Time difference positioning method for resisting sampling synchronous error of receiver |
WO2014120012A1 (en) * | 2013-01-31 | 2014-08-07 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Determining a position of a mobile communication device |
US9526074B2 (en) | 2013-03-15 | 2016-12-20 | Google Technology Holdings LLC | Methods and apparatus for determining a transmit antenna gain and a spatial mode of a device |
CN103259638B (en) * | 2013-04-19 | 2016-03-30 | 电子科技大学 | Base band time difference estimation method under the local oscillator conformity error of a kind of strange land |
US20180317019A1 (en) | 2013-05-23 | 2018-11-01 | Knowles Electronics, Llc | Acoustic activity detecting microphone |
US9191916B1 (en) * | 2013-09-30 | 2015-11-17 | Sprint Spectrum L.P. | Method and system for skewing location determinations |
US9408047B2 (en) | 2013-10-10 | 2016-08-02 | Telecommunication Systems, Inc. | Read acknowledgement interoperability for text messaging and IP messaging |
KR101490181B1 (en) * | 2013-11-11 | 2015-02-05 | 국방과학연구소 | Device and method for estimating doppler frequency difference for fdoa |
US9625566B2 (en) | 2014-05-21 | 2017-04-18 | Raytheon Company | Direct geolocation from TDOA, FDOA and AGL |
KR101515513B1 (en) * | 2014-07-29 | 2015-04-28 | 엘아이지넥스원 주식회사 | apparatus for estimating location based on time difference of arrival |
KR101515512B1 (en) * | 2014-07-29 | 2015-04-28 | 엘아이지넥스원 주식회사 | Method for estimating location based on time difference of arrival |
US10802108B2 (en) | 2014-07-31 | 2020-10-13 | Symbol Technologies, Llc | Two pass detection technique for non-echo pulsed ranging |
KR101644560B1 (en) | 2014-09-02 | 2016-08-01 | 국방과학연구소 | 2-STEP FDOA/FDOA estimation Method and Apparatus |
US10045140B2 (en) | 2015-01-07 | 2018-08-07 | Knowles Electronics, Llc | Utilizing digital microphones for low power keyword detection and noise suppression |
JP6592912B2 (en) * | 2015-02-13 | 2019-10-23 | 株式会社国際電気通信基礎技術研究所 | Communication system, receiving device, server, signal processing method, wave source position calculating method, and program |
CN104640206B (en) * | 2015-02-15 | 2018-01-19 | 中国民航大学 | A kind of multipoint positioning method of centering type star cloth station system |
US11079481B2 (en) * | 2015-04-02 | 2021-08-03 | Samsung Electronics Co., Ltd. | Apparatus and method for measuring distance and location |
US9872141B2 (en) | 2015-05-14 | 2018-01-16 | Verint Systems Ltd. | System and method for accurate location of wireless terminals using mobile interrogation device |
US10666416B2 (en) | 2016-04-14 | 2020-05-26 | Ibiquity Digital Corporation | Time-alignment measurement for hybrid HD radio technology |
US9832007B2 (en) * | 2016-04-14 | 2017-11-28 | Ibiquity Digital Corporation | Time-alignment measurement for hybrid HD radio™ technology |
JP6569612B2 (en) * | 2016-07-08 | 2019-09-04 | 三菱電機株式会社 | Radio source location estimation device |
CN106405496A (en) * | 2016-08-31 | 2017-02-15 | 北斗时空信息技术(北京)有限公司 | TDOA-based indoor positioning method |
CN107843910B (en) * | 2016-09-21 | 2021-03-16 | 上海创远仪器技术股份有限公司 | Virtual multi-station TDOA (time difference of arrival) positioning method and device suitable for complex environment |
IL248058B (en) | 2016-09-26 | 2021-04-29 | Verint Systems Ltd | System and method for obtaining an indentifier of a mobile communication terminal at a control checkpoint |
KR101876645B1 (en) * | 2016-12-05 | 2018-07-09 | 연세대학교 산학협력단 | System and method of calculating angle of arrival based time difference |
US10382094B2 (en) * | 2017-11-28 | 2019-08-13 | International Business Machines Corporation | Cable tracking by electromagnetic emission |
JP6625295B1 (en) * | 2018-03-02 | 2019-12-25 | 三菱電機株式会社 | Target monitoring device and target monitoring system |
EP3874292A4 (en) * | 2018-11-01 | 2022-08-17 | Hoopo Systems Ltd. | Method and system for radiolocation at reduced data transfer |
US11399262B2 (en) * | 2019-07-28 | 2022-07-26 | Polaris Wireless, Inc. | Estimating the location of a reference radio in a multi-story building and using the estimated location of the reference radio to estimate the location of a wireless terminal |
CN110533233B (en) * | 2019-08-20 | 2020-07-31 | 河海大学 | Wireless microwave rain measuring link planning method based on fitness optimization |
US11082854B2 (en) * | 2019-09-27 | 2021-08-03 | Apple Inc. | Signal validation for secure ranging |
CN112969231A (en) | 2019-12-12 | 2021-06-15 | 中磊电子(苏州)有限公司 | Ultra-wideband positioning system, base station, tag and operating method thereof |
CN112255589B (en) | 2020-09-18 | 2024-01-26 | 中磊电子(苏州)有限公司 | Positioning tag operation method and positioning system operation method |
CN112688716B (en) * | 2020-11-06 | 2021-12-24 | 西安电子科技大学 | Time-frequency difference estimation method for time-frequency aliasing signals |
CN112904274A (en) * | 2021-01-21 | 2021-06-04 | 中国人民解放军海军工程大学 | Multi-moving-object positioning method for improving TDOA/FDOA algorithm |
Family Cites Families (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4888593A (en) | 1987-12-15 | 1989-12-19 | Signal Science, Inc. | Time difference of arrival geolocation method, etc. |
US5265121A (en) | 1989-10-17 | 1993-11-23 | Juanita H. Stewart | Spread spectrum coherent processor |
JPH0797131B2 (en) * | 1990-04-12 | 1995-10-18 | パイオニア株式会社 | Satellite radio wave capturing method of GPS receiver |
US5208756A (en) | 1991-01-28 | 1993-05-04 | Song Han L | Vehicle locating and navigating system |
US5327144A (en) * | 1993-05-07 | 1994-07-05 | Associated Rt, Inc. | Cellular telephone location system |
US5570099A (en) * | 1993-10-15 | 1996-10-29 | Loral Federal Systems Company | TDOA/FDOA technique for locating a transmitter |
US5621416A (en) * | 1995-02-02 | 1997-04-15 | Trimble Navigation Limited | Optimized processing of signals for enhanced cross-correlation in a satellite positioning system receiver |
US5874916A (en) | 1996-01-25 | 1999-02-23 | Lockheed Martin Corporation | Frequency selective TDOA/FDOA cross-correlation |
US6047192A (en) * | 1996-05-13 | 2000-04-04 | Ksi Inc. | Robust, efficient, localization system |
US6108555A (en) | 1996-05-17 | 2000-08-22 | Ksi, Inc. | Enchanced time difference localization system |
US6034635A (en) | 1996-06-06 | 2000-03-07 | Gilhousen; Klein S. | Method for using only two base stations for determining the position of a mobile subscriber in a CDMA cellular telephone system |
US5859612A (en) | 1996-06-06 | 1999-01-12 | Qualcomm Incorporated | Method for using an antenna with a rotating beam for determining the position of a mobile subscriber in a CDMA cellular telephone system |
US6160758A (en) | 1996-06-28 | 2000-12-12 | Scientific Innovations, Inc. | Utilization of auto and cross-correlation functions in methods for locating a source of a primary signal and for localizing signals |
US5945948A (en) * | 1996-09-03 | 1999-08-31 | Motorola, Inc. | Method and apparatus for location finding in a communication system |
US6236365B1 (en) | 1996-09-09 | 2001-05-22 | Tracbeam, Llc | Location of a mobile station using a plurality of commercial wireless infrastructures |
US6249252B1 (en) | 1996-09-09 | 2001-06-19 | Tracbeam Llc | Wireless location using multiple location estimators |
GB2354129B (en) | 1996-09-09 | 2001-05-09 | Dennis J Dupray | Wireless location using multiple simultaneous location estimators |
US5890068A (en) * | 1996-10-03 | 1999-03-30 | Cell-Loc Inc. | Wireless location system |
US6026304A (en) * | 1997-01-08 | 2000-02-15 | U.S. Wireless Corporation | Radio transmitter location finding for wireless communication network services and management |
US5936571A (en) | 1997-01-31 | 1999-08-10 | Lockheed Martin Corporation | Integrated GPS/interference location system |
US6021330A (en) * | 1997-07-22 | 2000-02-01 | Lucent Technologies Inc. | Mobile location estimation in a wireless system using designated time intervals of suspended communication |
US6243587B1 (en) | 1997-12-10 | 2001-06-05 | Ericsson Inc. | Method and system for determining position of a mobile transmitter |
US6522887B2 (en) * | 1998-07-27 | 2003-02-18 | Telefonaktiebolaget Lm Ericsson (Publ) | Identifying starting time for making time of arrival measurements |
US6330452B1 (en) * | 1998-08-06 | 2001-12-11 | Cell-Loc Inc. | Network-based wireless location system to position AMPs (FDMA) cellular telephones, part I |
BR9912770B1 (en) * | 1998-08-07 | 2014-06-17 | Ericsson Telefon Ab L M | PROCESSING TO USE A MOBILE COMMUNICATION STATION IN A WIRELESS COMMUNICATION NETWORK TO MEET THEIR ARRIVAL TIMES ARRIVAL TIMES RESPECTIVELY TRANSMITTED BY A PLURALITY OF NEIGHBOR TRANSMITTERS ON THE NETWORK, AND, A MUSIC COMMUNICATION NETWORK LOCATION OF MOBILE COMMUNICATION STATION POSITION IN A WIRELESS COMMUNICATION NETWORK |
US6246884B1 (en) | 1998-08-19 | 2001-06-12 | Sigmaone Communications Corporation | System and method for measuring and locating a mobile station signal in a wireless communication system |
US6184829B1 (en) | 1999-01-08 | 2001-02-06 | Trueposition, Inc. | Calibration for wireless location system |
DE69936354T2 (en) * | 1999-01-08 | 2008-06-19 | Trueposition, Inc. | SYNTHESIS OF BANDWIDTH FOR A WIRELESS POSITION DETERMINATION SYSTEM |
CA2360136C (en) * | 1999-01-08 | 2008-02-19 | Trueposition, Inc. | Method for improving the accuracy of the wireless location system |
IL147720A0 (en) * | 1999-07-20 | 2002-08-14 | Snaptrack Inc | Method for determining a change in a communication signal and using this information to improve sps signal reception and processing |
EP1091611B1 (en) * | 1999-10-06 | 2007-08-29 | Matsushita Electric Industrial Co., Ltd. | Location system for a cellular telecommunications network |
US6366240B1 (en) * | 2000-06-14 | 2002-04-02 | L-3 Communications Corporation | Location of aircraft with time difference of arrival |
-
2001
- 2001-07-18 US US09/908,998 patent/US6876859B2/en not_active Expired - Lifetime
-
2002
- 2002-01-10 MX MXPA04000461A patent/MXPA04000461A/en active IP Right Grant
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- 2002-01-10 KR KR1020047000688A patent/KR100881946B1/en active IP Right Grant
- 2002-01-10 CA CA2454161A patent/CA2454161C/en not_active Expired - Lifetime
- 2002-01-10 CN CNB028142489A patent/CN100397911C/en not_active Expired - Fee Related
- 2002-01-10 IL IL15941302A patent/IL159413A0/en unknown
- 2002-01-10 WO PCT/US2002/000754 patent/WO2003009613A1/en active Application Filing
- 2002-01-10 EP EP02714730A patent/EP1417847B1/en not_active Expired - Lifetime
- 2002-01-10 ES ES02714730T patent/ES2386669T3/en not_active Expired - Lifetime
- 2002-01-10 JP JP2003514822A patent/JP2004536533A/en active Pending
- 2002-01-10 GB GB0403381A patent/GB2395080B/en not_active Expired - Fee Related
-
2003
- 2003-12-17 IL IL159413A patent/IL159413A/en unknown
-
2009
- 2009-03-06 JP JP2009052961A patent/JP2009162771A/en not_active Ceased
-
2012
- 2012-09-28 JP JP2012216896A patent/JP2013057668A/en active Pending
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ATE546975T1 (en) | 2012-03-15 |
CN100397911C (en) | 2008-06-25 |
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