GNSS/SINS Integrated SAR Motion Compensation Sensor

Yongrong Sun, Wu Chen, Jianye Liu and Yongqi Chen

Abstract:	Synthetic Aperture Radar (SAR) is an imaging radar system, which utilizes aircraft motion and signal coherency to allow the formation of a synthetic aperture that is much longer than the real antenna. The formation of SAR image is theoretically based upon uniform rectilinear motion. But in real situations, the flight cannot be kept in a uniform rectilinear motion due to air turbulence, high-altitude winds and other factors. Therefore, the motion compensation is needed to achieve the high-resolution image. The key to successful SAR motion compensation is to determine the accurate precise position of radar antenna phase center (APC) relative to target during the SAR imaging interval, and derive the displace of APC along radar line-of-sight (LOS) direction with time. This paper presents an integrated GNSS/SINS navigation system developed for SAR motion compensation. A number of issues related to the system, such as system design, error models and navigation algorithms, are stressed in the paper. The experiment results show that the new system can provide accurate navigation information (position, velocity and attitude) to meet the requirements of SAR motion compensation. Keywords 쳌F motion information sensor, motion compensation, strapdown INS, Kalman filter, Synthetic Aperture Radar
Published in:	Proceedings of the 58th Annual Meeting of The Institute of Navigation and CIGTF 21st Guidance Test Symposium (2002) June 24 - 26, 2002 Hyatt Regency Hotel Albuquerque, NM
Pages:	261 - 268
Cite this article:	Sun, Yongrong, Chen, Wu, Liu, Jianye, Chen, Yongqi, "GNSS/SINS Integrated SAR Motion Compensation Sensor," Proceedings of the 58th Annual Meeting of The Institute of Navigation and CIGTF 21st Guidance Test Symposium (2002), Albuquerque, NM, June 2002, pp. 261-268.
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