一种用于单脉冲成像的自聚焦算法

摘要

本文针对单脉冲成像技术在实际处理中，鉴角曲线误差引起的方位分辨率下降问题，提出了一种用于单脉冲成像的自聚焦算法。算法通过迭代，自动从雷达接收数据中挑选孤立强散射点回波信号精确估计实际鉴角曲线，将其用于单脉冲成像处理中，实现图像方位自聚焦。仿真及实测数据处理结果表明，该方法能够有效降低测角误差对成像效果的影响，且对多数地貌场景数据具备鲁棒性，是一种实际可行的单脉冲成像自聚焦算法。%To overcome the deterioration of azimuth resolution caused by errors of monopulse response curve (MRC)in practical processing,this paper proposes an autofocusing algorithm for monopulse imaging technique.By applying iterative steps, this algorithm automatically extracts the echo signals of isolated strong scatterers from the received data,and employs them to ac-curately estimate the actual MRC.The estimated curve is then used in the procedure of monopulse imaging to autofocus the image in azimuth.As is verified by simulation and experimental results,this algorithm can effectivelyreduce the impact of MRC errors on monopulse imaging and is robust to most of the ground scenes,making it feasible in practical processing.