曲线运动SAR成像算法研究

摘要

研究合成孔径雷达曲线运动时的优化成像质量问题.提出了一种结合了惯导加速度参数和根据回波数据两种运动补偿曲线运动合成孔径雷达成像算法,提高了成像质量.首先研究了合成孔径雷达曲线运动时的目标模型,分析了惯性导航系统的原理,并以频谱分析的子孔径成像为基础,加入运动补偿等辅助处理.进行仿真,根据一组仿真参数和曲线轨迹生成仿真回波数据,证明仿真成像算法的有效性.系统运算简单,可为曲线运动时的合成孔径雷达实时信号处理系统系统设计提供依据.%The paper studied the method of improving the image quality of SAR with the curvilinear motion. An imaging algorithm combined with motion compensation based on both INS acceleration parameter and echo data was proposed. The SAR target model of curvilinear motion was discussed. The working principle of INS was analyzed. Based on the SPECAN sub-aperture algorithm, some secondary treatments such as motion compensation were added. Finally, according to a set of simulation parameters and a curvilinear orbit, the effectiveness of the algorithm was veri fied by imaging simulation. The arithmetic is simple and can provide the basis for the design of real-time processing system of SAR with the curvilinear motion.