Title: AN INTEGRATED NAVIGATION SYSTEM USING GPS CARRIER PHASE FOR REAL-TIME AIRBORNE/SYNTHETIC APERTURE RADAR (SAR)
Author(s): Theodore J. Kim, J. Rick Fellerhoff, and Stewart M. Kohler
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 48, Number 1
Pages: 13 - 24
Cite this article: Kim, Theodore J., Fellerhoff, J. Rick, Kohler, Stewart M., "AN INTEGRATED NAVIGATION SYSTEM USING GPS CARRIER PHASE FOR REAL-TIME AIRBORNE/SYNTHETIC APERTURE RADAR (SAR)", NAVIGATION, Journal of The Institute of Navigation, Vol. 48, No. 1, Spring 2001, pp. 13-24.
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Abstract: A real-time synthetic aperture radar SAR requires accurate measurement of the motion of the radar antenna with minimal latency to produce well-focused images with minimal absolute position error. The motion measurement system consists of a flight computer; an inertial measurement unit; and a P-code GPS receiver that outputs corrected ephemeris, L1 and L2 pseudoranges, and L1 and L2 carrier-phase measurements. The unknown initial carrier-phase biases to the GPS satellites are modeled as states in an extended Kalman filter, and the resulting integrated navigation solution has position errors that change slowly with time. Position error drifts of less than 1 cms have been measured from the SAR imagery for apertures of various lengths.