Dual antenna diversity method to detect GPS signal tampering

Details Dual antenna diversity method to detect GPS signal tampering Dual antenna diversity method to detect GPS signal tampering

2007-12-18

2007-12-18

Tarcza, Thomas (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

C342S357490

Reexamination Certificate

active

11191673

ABSTRACT:
A method of detecting GPS signal tampering uses two GPS receivers. A first receiver measures carrier phases of two or more satellite signals and of a tampered signal. A second receiver measures carrier phases of the two or more satellite signals and the tampered signal. A baseline vector between the receiver antennas is measured. Direction cosine vectors of the two or more satellite signals are computed and a dot product is computed from the baseline vector to translate measurements made at antennas of the GPS receivers to a virtual zero baseline condition. The carrier phase measurements are double differenced to obtain double difference residuals. A test statistic of the double difference residuals is computed and tested for phase coherency. An inconsistency in measured signals is flagged when there is an inconsistency in phase coherence indicating the tampered signal is present.

REFERENCES:
patent: 5296861 (1994-03-01), Knight
patent: 5610614 (1997-03-01), Talbot et al.
patent: 6268824 (2001-07-01), Zhodzishky et al.
patent: 6424915 (2002-07-01), Fukuda et al.
patent: 6639541 (2003-10-01), Quintana et al.
patent: 6674399 (2004-01-01), Zhodzishky et al.
patent: 6720914 (2004-04-01), Toda et al.
patent: 6754584 (2004-06-01), Pinto et al.
patent: 2003/0085839 (2003-05-01), Zhodzishky et al.
patent: 2003/0154049 (2003-08-01), Toda
patent: 2004/0145518 (2004-07-01), Toda et al.
patent: 2004/0257275 (2004-12-01), Yee et al.
patent: 2005/0137799 (2005-06-01), Alban et al.
“New Algorithm for Attitude Determination Using GPS Signals”, F. Berneli-Zazzera et al., XVI Congresso Nazionale AIDAA, Sep. 24-28, 2001, Palermo, Italy.
“Basics of the GPS Technique: Observation Equations” Geoffrey Blewitt, from the textbook “Geodetic Applications of GPS”, published by the Swedish Land Survey, 1997.
“HAZMAT Keeps on Truckin” Glenn Gibbons, GPS World, Oct. 1, 2004.
GPS Theory and Practice, pp. 163-164, B. Hofmann-Wellenhof, H. Lichtenegger and J. Collins, 4th revised edition, Springer-Verlag Wien, New York, 1997.

Affiliated with

Also associated with

Rating

Dual antenna diversity method to detect GPS signal tampering does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dual antenna diversity method to detect GPS signal tampering, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual antenna diversity method to detect GPS signal tampering will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3857824