Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2007-04-19
2009-11-24
Issing, Gregory C (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C342S357490
Reexamination Certificate
active
07623070
ABSTRACT:
A method and apparatus mitigating the effects of cross-correlation signals on received satellite signals in a Global Positioning System (GPS) receiver is described. MS-Assisted and MS-Based cross-correlation detection and mitigation methods and apparatus are described. A GPS search mode architecture is used to detect SV signals and identify potential cross-correlations. The GPS search modes have different coherent integration lengths and different degrees of sensitivity. After detection, measurements are logged into a database for further processing. Several cross-correlation tests are described. For example, a “Mainlobe” cross-correlation test is described that identifies the most significant cross-correlations that occur when the Doppler difference between the interfering SV signal and the target SV signal is nonzero and a multiple of 1 kHz. Appropriate C/No and Doppler thresholds, or masks, are selected and used to identify the mainlobe cross-correlations. A wide Doppler mask is used to account for the effects on cross-correlations caused by BPSK data bit modulation. Appropriate MS-Assisted and MS-Based cross-correlation masks are described. Other cross-correlation tests include “variable C/No”, “strong”, “wide Doppler” and “pre-emptive” cross-correlation detection tests.
REFERENCES:
patent: 6236354 (2001-05-01), Krasner
patent: 6282231 (2001-08-01), Norman et al.
patent: 6466161 (2002-10-01), Turetzky et al.
patent: 6529829 (2003-03-01), Turetzky et al.
patent: 6873910 (2005-03-01), Rowitch et al.
patent: 7002514 (2006-02-01), Basch et al.
patent: 7209076 (2007-04-01), Roh
patent: 04005954 (2004-01-01), None
patent: 04017089 (2004-02-01), None
Ziedan et anl, “Unadided Acquisition of Weak GPS Signals Using Circular Correlation or Double Block Padding,” PLANS 2004, Apr. 26-29, 2004, pp. 461-470.
International Search Report - PCT/US05/038411 - International Search Authority - European Patent Office - May 10, 2006.
Written Opinion - PCT/US05/038411 - International Search Authority - European Patent Office - May 10, 2006.
International Preliminary Report on Patentability - PCT/US05/038411 - The International Bureau of WIPO - Switzerland - May 1, 2007.
Kaplan et al., “Understanding GPS: Principles and Applications”, 1996, pp. 83-236, Artech House, Massachusettes, USA.
Gunderson Linda G.
Issing Gregory C
QUALCOMM Incorporated
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