机载合成孔径雷达ETF成像算法研究

Research on ETF Algorithm for Airborne SAR Imaging

根据传统ETF成像算法,详细推导机载斜视模式下最优聚焦函数,分析算法使用中应该满足的分块处理条件,给出算法实现流程。与传统ETF算法相比,该算法推导过程方位相位的计算不作近似截取而作准确计算,使得该算法具最优的相位精度。分块处理条件的推导为算法的实际应用提供了理论依据。点目标仿真以及原始回波数据成像结果证明该算法有效。

According to conventional ETF(exact transfer function)algorithm,the optimum exact transfer function for airborne squint SAR imaging mode is deduced in detail.The block processing requirement is analyzed and developed in detail for actual use and the algorithm flow iss proposed too.Because the deduction is based on precise computing instead of approximate truncation for azimuth phase preservation,the algorithm performs optimum phase precision.The block processing requirement is beneficial to the engineering implementation of the algorithm.The results for processing simulated point targets and raw echoes show the validity of the algorithm.