舰载ISAR成像平台运动补偿新方法研究

Research on a New Method of Platform Motion Compensation for Shipborne ISAR Imaging

摘要:

针对舰载逆合成孔径雷达(InverseSyntheticApertureRadar,ISAR)平台的三维摆动导致舰载ISAR图像的聚焦程度严重下降的问题,提出一种利用回波数据估计雷达平台的摆动参数进行平台运动补偿的方法。首先对回波数据进行时频分析,通过估计多普勒频率的周期获得平台摆动周期的估计值,进而以图像熵作为判据,获得平台的摆动幅度信息,最后构建补偿信号并进行成像。仿真实验结果表明,提出的方法可有效补偿雷达平台的摆动、提高ISAR图像质量。

Abstract:

Aiming at the problem that the image focusing degree is seriously reduced dueto the three-dimensional swing of shipborne inverse synthetic aperture radar ( ISAR)platform, a motion compensation method for radar platform based on echo data is proposed.Firstly, time-frequency analysis of the echo data is performed and the swing period isestimated by estimating the period of Doppler frequency, Then, the swing amplitude of theplatform is obtained by using the image entropy. Finally, compensation signal is constructecand image is performed, Simulation results show that the method can effectively compensatethe radar platform swing and improve the quality of ISAR image.