Simulation Study of UWB-OFDM SAR for Navigation with INS Integration

K. Kauffman, J. Raquet, Y. Morton, D. Garmatyuk

Abstract:	There is a great need to develop non-GPS based methods for position and navigation in situations where GPS is not available. This paper presents simulation studies of an Ultra-Wideband Orthogonal Frequency Division Multiplexed radar integrated with an INS to improve the performance of the INS position estimate. The radar is onboard an aerial vehicle and collects data periodically in a sidelooking stripmap Synthetic Aperture Radar configuration. The trajectory of the aerial vehicle is modeled as a First-order Gauss Markov process. INS measurements and SAR data are generated with simulated errors and noise respectively. An Extended Kalman Filter is developed using INS error states as well as states for the positions of strong reflectors detected within the SAR data. Ranges to the reflectors are modeled as measurements in the EKF and used to correct the INS error states. The resulting estimated INS errors from the EKF are subtracted from the INS measurements to obtain the estimated aerial vehicle’s position and velocity. The filter performance and its dependence on INS quality are analyzed based on simulation results. The simulations are run with INS error models of commercial-grade, tactical-grade, and navigation-grade INS systems.
Published in:	Proceedings of the 2011 International Technical Meeting of The Institute of Navigation January 24 - 26, 2011 Catamaran Resort Hotel San Diego, CA
Pages:	184 - 191
Cite this article:	Kauffman, K., Raquet, J., Morton, Y., Garmatyuk, D., "Simulation Study of UWB-OFDM SAR for Navigation with INS Integration," Proceedings of the 2011 International Technical Meeting of The Institute of Navigation, San Diego, CA, January 2011, pp. 184-191.
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