Performance Analysis of Measurement Inaccuracies of IMU/GPS on Airborne Repeat-pass Interferometric SAR in the Presence of Squint
Deng Yuan①② Li Yin-wei①② Xiang Mao-sheng① Wei Li-deng①
①(National Key Laboratory of Science and Technology on Microwave Imaging, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ②(University of Chinese Academy of Sciences, Beijing 100049, China)
In the MOtion COmpensation (MOCO) approach to airborne repeat-pass interferometric Synthetic Aperture Radar (SAR) based on motion measurement data, the measurement inaccuracies of Inertial Measurement Unit/Global Positioning System (IMU/GPS) and the positioning errors of the target, which may contribute to the residual uncompensated motion errors, affect the imaging result and interferometric measurement. Considering the effects of the two types of error, this paper builds a mathematical model of residual motion errors in presence of squint, and analyzes the effects on the residual motion errors induced by the measurement inaccuracies of IMU/GPS and the positioning errors of the target. In particular, the effects of various measurement inaccuracies of IMU/GPS on interferometric SAR image quality, interferometric phase, and digital elevation model precision are disscussed. Moreover, the paper quantitatively researches the effects of residual motion errors on airborne repeat-pass interferometric SAR through theoretical and simulated analyses and provides theoretical bases for system design and signal processing.
邓 袁, 李银伟, 向茂生, 韦立登. IMU/GPS 测量误差对斜视条件下机载重轨干涉SAR 系统性能的影响分析[J]. 雷达学报, 2014, 3(4): 428-438.
Deng Yuan, Li Yin-wei, Xiang Mao-sheng, Wei Li-deng. Performance Analysis of Measurement Inaccuracies of IMU/GPS on Airborne Repeat-pass Interferometric SAR in the Presence of Squint. JOURNAL OF RADARS, 2014, 3(4): 428-438.
