降雨对极化雷达ISAR成像影响及修正方法研究  

Study on the Effect of Rainfall on Polarized Radar ISAR Imaging and Calibration Methods

作　　者：琚新杰 李心达 甘琳 沈淳 李健兵 JU Xinjie;LI Xinda;GAN Lin;SHEN Chun;LI Jianbing(State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics and Information System,College of Electronic Science and Technology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学电子科学学院复杂电磁环境效应国家重点实验室,湖南长沙410073

出　　处：《雷达科学与技术》2024年第6期644-656,共13页Radar Science and Technology

基　　金：国家自然科学基金(No.62231026)。

摘　　要：极化逆合成孔径雷达(Pol-ISAR)能够对目标进行全天时全天候的高分辨成像观测,是获取空天目标信息的重要手段,但是复杂大气环境下的电波传播效应可能对成像结果造成重大影响。本文建立了全极化雷达在复杂降雨条件下的ISAR成像模型,分析了降雨环境下传播效应所导致的极化电磁波幅度衰减和相位误差,提出了传播效应对ISAR成像影响的修正方法,为多极化通道融合成像提供重要支撑。实验结果验证了复杂降雨条件下ISAR成像模型的正确性和传播效应修正方法的有效性。Polarized inverse synthetic aperture radar(Pol‑ISAR)is capable of all‑weather, all‑day and high‑resolutionimaging observation of targets, which is an important means of acquiring information about space targets. However,the radio wave propagation effect under complex atmospheric environment may have a significant impact on the imagingresults. The ISAR imaging model of fully polarized radar under complex rainfall conditions is established.The polarizedelectromagnetic wave amplitude attenuation and phase error caused by the propagation effect under rainfall environmentare analyzed. A method to calibrate the propagation effect on ISAR imaging is proposed, which provides importantsupport for the fusion imaging of the multipolar channels. The experimental results verify the correctness of the ISAR imagingmodel and the effectiveness of the propagation effect calibration method under complex rainfall conditions.

关 键 词：极化逆合成孔径雷达 复杂降雨 传输效应 幅相误差 

分 类 号：TN954[电子电信—信号与信息处理] TN958.98[电子电信—信息与通信工程]