环视SAR几何失真校正误差分析及补偿技术研究
doi: 10.3724/SP.J.1146.2007.00679
Study on Error Analysis of Geometric Distortion Correction and Compensation Techniques for Circular-Scan SAR
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摘要: 环视合成孔径雷达(circular-scan SAR)主要用于在导弹精确末制导中进行景象匹配，成像几何精度对最终的目标定位至关重要。由于GPS/IMU测量误差的存在，使得环视SAR在采用基于GPS/IMU的成像几何失真校正方法进行校正后图像仍存在一定的失真。该文分析了环扫天线扫描角度误差和天线相位中心(APC)位置测量误差对成像几何失真校正的影响，并针对环视SAR的特点提出了有效的基于数据的运动参数估计方法。实测数据处理结果验证了分析的正确性及补偿方案的可行性。Abstract: Circular-Scan SAR is mainly used for scene matching in the precision-guided missiles, where geometry accuracy is very important. However, due to errors introduced by the GPS/IMU, it remains somewhat geometric distortion after geometric distortion correction based on the GPS/IMU data. This paper analyzes the impact of the error of scan angle and aircraft height and aircraft velocity on the image quality. Meanwhile, approaches to correcting these errors based on measured data are presented. Experiments carried out on measured data confirm the validity of the analysis and the feasibility of the compensation scheme.
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