Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-03-03
2011-11-15
Timory, Kabir A (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S135000, C375S136000, C375S137000, C375S152000, C375S144000
Reexamination Certificate
active
08059700
ABSTRACT:
A method of processing positioning signal constituted by a superposition of individual signals generated by a plurality of emitters, in particular satellite emitters, comprising:—a first step of coarse acquisition of said individual signals, comprising correlation of the received positioning signal with locally generated replicas of said individual signals;—a step of identifying spurious correlation peaks induced by interferences; and—a step of estimating the code delays and the carrier frequency shifts of the acquired individual signals which are not affected by said interferences. According to preferred embodiments of the invention, the method can also comprise:—a refining step of determining more accurate estimates of said code delays and carrier frequency shifts; and—a step of interference cancellation. The method of the invention is particularly suitable to indoor positioning applications.
REFERENCES:
patent: 4445118 (1984-04-01), Taylor et al.
patent: 5225842 (1993-07-01), Brown et al.
patent: 5420592 (1995-05-01), Johnson
patent: 5663734 (1997-09-01), Krasner
patent: 6236354 (2001-05-01), Krasner
patent: 6646596 (2003-11-01), Syrjarinne et al.
patent: 6707423 (2004-03-01), Turetzky et al.
patent: 6795771 (2004-09-01), Fuchs et al.
patent: 2001/0002203 (2001-05-01), Cahn et al.
patent: 2002/0183071 (2002-12-01), Shioda et al.
patent: 2003/0165186 (2003-09-01), Kohli et al.
patent: 2004/0042568 (2004-03-01), Rowitch
patent: 2005/0032513 (2005-02-01), Norman et al.
patent: 2005/0099334 (2005-05-01), Roh
patent: 03/039021 (2003-05-01), None
patent: 2004/005954 (2004-01-01), None
G. Sun et al, “Signal Processing Techniques in Network-Aided Positioning; A survey of the state-of-the-art positioning designs”, IEEE Signal Processing Magazine, Jul. 2005; pp. 12-23.
O. Otaegui et al., “Real Time Fast Acquisition based on Hardware FFT for a GPS/EGNOS receiver”, Proceedings of the European Navigation Conference ENC-GNSS 2005.
J. Syrjarinne et al., “Possibilities for GPS Time Recovery with GSM Network Assistance”, ION GPS 2000, Sep. 19-22, 2000, Salt Lake City, UT, pp. 955-966.
K. Pahlavan et al., “Indoor Geolocation Science and Technology”, IEEE Communications Magazine, Feb. 2002, pp. 112-118.
B. Peterson et al., “GPS Receiver Structures for the Urban Canyon”, Proceedings of the ION GPS, 1995, pp. 1323-1332.
M. Psiaki, “Block Acquisition of Weak GPS Signals in a Software Receiver”, ION GPS 2001, Sep. 11-14, 2001, Salt Lake City, UT, pp. 1-13.
W. Utlaut, “Spread Spectrum: Principles and Possible Application to Spectrum Utilization and Allocation”, IEEE Communications Society Magazine, Sep. 1978, pp. 21-31.
Y. Morton et al, “Assessment and Handling of CA Code Self-Interference during Weak GPS Signal Acquisition”, ION GPS/GNSS 2003, Sep. 9-12, 2003, Portland, OR, pp. 646-653.
P. Madhani et al., “Application of Successive Interference Cancellation to the GPS Pseudolite Near-Far Problem”, IEEE Transactions on Aerospace and Electronic Systems, vol. 39, No. 2, Apr. 2003, pp. 481-488.
G. Lopez-Risueno et al., “CN0 Estimation and Near-Far Mitigation for GNSS Indoor Receivers”, Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st In Vehicular Technology Conference, pp. 2624-2628 vol. 4.
G. Lopez-Risueno et al., “Measurement and Processing of Indoor GPS Signals Using a One-Shot Software Receiver”, Proceedings of ESA Navitec 2004.
G. Lopez-Risueno et al., “Evaluation of GPS Indoor Positioning using Real Measurements and a One-Shot Software Receiver”, Proceedings of the European Navigation Conference ENC-GNSS 2005.
G. Lachapelle, “GNSS Indoor Location Technologies”, Proceedings of the 2004 International Symposium on GPS/GNSS (GNSS 2004), Australia.
E. Glennon et al, “A Review of GPS Cross Correlation Mitigation Techniques”, The 2004 International Symposium on GNSS/GPS, Sydney , Australia, Dec. 6-8, 2004.
G. Hein et al., Status of Galileo Frequency and Signal Design,Proceedings of the ION GPS 2002.
G. Lachapelle et al., “HSGPS Signal Analysis and Performance under Various Indoor Conditions”, Navigation: Journal of the Institute of Navigation (ION), vol. 51, No. 1, spring 2004.
D. Lin et al., “Comparison of Acquisition Methods for Software GPS Receiver”, ION GPS 2000, Sep. 19-22, 2000, Salt Lake City, UT, 2385-2390.
J. Jarvinen et al, “Assisted GPS: A Low-Infrastructure Approach”, GPS World, the Business and Technology of Global Navigation and Positioning, Mar. 2002.
3rd Generation Partnership Project (3GPP), “Technical Specification Group Radio Access Network: Stage 2 functional specification of User Equipment (UE) positioning in UTRAN (Release 7)”, Technical Specification TS 25.305 v7.00, 3GPP, 2005, http://www.3gpp.org, Jun. 2005.
Coordination Group on Access to Location Information for Emergency Services (CGALIES). Work Package 1, Technical report, 2002, http://www.telematica.de.cgalies, Feb. 18, 2002.
J. Tsui, “Acquisition of Weak Signals”, Fundamentals of Global Positioning Receivers: A Software Approach, Second Edition, 2005, John Wiley & Sons, Inc., 224-270, 286-288.
Parkinson et al. (Editors), Global Positioning System: Theory and Applications. American Institute of Aeronautics and Astronautics, vol. 1, 1996, 390-392.
J. Spilker, Digital Communications by Satellite. Prentice-Hall, 1977, 586-597.
E. Kaplan (editor), Understanding GPS: Principles and Applications. Artech House, 1996, 3-5, 140-142, 155-175, 219-228, 302-327.
Granados Gonzalo Seco
Lopez-Risueno Gustavo
Agence Spatiale Europeenne
Clark & Brody
Timory Kabir A
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