Method and system for attitude determination of a platform...

Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite

Reexamination Certificate

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Reexamination Certificate

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07397422

ABSTRACT:
A system and method for determining the attitude of a platform is provided. The method includes: (a) Searching and scanning for one or more GPS satellite(s) to determine initial platform position; wherein a single directionally steered antenna scans for the GPS/GNSS satellite; (b) pointing and scanning the antenna to GPS/GNSS satellite to determine a first angular measurement of a direction of a GPS/GNSS signal; (c) measuring carrier to noise ratio of the GPS/GNSS satellite; (d) dithering the single directionally steered antenna to obtain an angular measurement relative to an antenna pattern bore-sight reference; (e) repeating steps (b)-(d) to determine a second angular measurement of the direction of a second GPS signal; (f) determining the attitude error of the platform using the first and second angular measurements; (g) updating the platform position and attitude.

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patent: 6930636 (2005-08-01), Fowell
P.J. Buist, Full Attitude from a Single GPS Antenna: Demonstration of Concept with Orbital Data from PoSAT-1, Proceedings of the 4th International Conference on Spacecraft Guidance, Navigation, and Control Systems, Oct. 1999.
Tekawy, J. A., “Precision Spacecraft Attitude Estimators using an Optical Payload Pointing System,” AIAA Journal of Spacecraft and Rockets, vol. 35, No. 4, Jul.-Aug. 1998.
Parkinson, Bradford and Spilker, James (editors), “Global Positioning System: Theory and Applications, Attitude Determination, vol. II” pp. 519-538, AIAA Progress in Astronautics and Aeronautics, vol. 164, 1996.

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