An Integrated Navigation System Using GPS Carrier Phase for Real-Time Airborne Synthetic Aperture Radar (SAR)

Theodore J. Kim, J. Rick Fellerhoff, and Stewart M. Kohler

Abstract:	A Synthetic Aperture Radar (SAR) requires accurate measurement of the motion of the radar antenna to produce well-focused images with minimal absolute position error, The motion measurement (MoMeas) system consists of a flight computer, an inertial measurement unit (IMU), and a P-code GPS receiver that outputs corrected ephemeris, L1 & L2 pseudoranges, and L1 & 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 cm/sec have been measured from the SAR imagery for various length apertures.
Published in:	Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999) June 27 - 30, 1999 Royal Sonesta Hotel Cambridge, MA
Pages:	263 - 272
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)," Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999), Cambridge, MA, June 1999, pp. 263-272.
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