极化有源雷达校准器的幅相失真分析及修正

Analysis and Modification of Amplitude-Phase Distortion in Polarimetric Active Radar Calibrator

极化有源雷达校准器(Polarimetric Active Radar Calibrator,PARC)可用于宽带高分辨雷达的定标,以使高分辨成像技术能准确刻画雷达目标的细微特征,但其作为有源器件会引入额外失真从而影响系统失真补偿.本文基于成对回波理论及频域失真补偿原理,通过将频域补偿转换为时域滤波,提出截取滤波器系数的方法以修正PARC失真.实测数据结果表明了理论分析和提出的修正方法的正确性,修正后的PARC可近似理想地补偿系统失真.

A polarimetric active radar calibrator （PARC）is used to calibrate wideband high-resolution radars,confir-ming the high-resolution imaging can accurately characterize radar targets.However,the PARC is an active component and induces additional distortion,affecting the system distortion compensation.This paper was based on the “method of paired echoes”and the distortion compensation in the frequency domain.After transforming the frequency compensation into the filtering in the time domain,we proposed to intercept the time filter for modifying the PARC distortion.The experimental re-sults based on real radar data confirm the accuracy of the theoretical analysis and the proposed modification method and after the modification the PARC can approximately compensate the system distortion.