逆合成孔径雷达横向距离定标

Cross-Range Scaling of Inverse Synthetic Aperture Radar

确定逆合成孔径雷达（ＩＳＡＲ）的横向距离因子，即横向距离定标，是利用ＩＳＡＲ获取正确的目标像和进行雷达目标识别的一个前提．ＩＳＡＲ的横向距离因子取决于雷达波长和目标相对于雷达视线（ＲＬＯＳ）在相参处理区间内的转角．前者可以已知，但后者在ＩＳＡＲ方式下则难以确定．本文根据层析成像原理，利用回波信号相参累积重建目标图像的特性，提出了一种估计非合作运动目标相对于ＲＬＯＳ在相参处理区间内转角的方法．它能够直接用来进行ＩＳＡＲ的横向距离定标．文中利用计算机仿真数据和微波暗室实测数据，对所述方法进行了验证．

This paper investigates the problem of cross-range scaling of inverse synthetic aperture radar (ISAR). It is very important to radar target classification and recognition via ISAR. The cross-range scale of ISAR depends on both radar wavelength and rotating angle of target relative to radar-line-of-sight (RLOS) during the coherent accumulation. The former is known while the latter is difficult to determine especially in the case of ISAR. In this paper, a new approach, which is based on the principle of tomographic imaging and the property of the coherent accumulation of echo data, is developed to estimate the rotating angle of target relative to RLOS during the coherent accumulation. It is able to carry out the cross-range scaling of ISAR. The proposed approach is used to process the computer simulated data and the real data of model B-52 collected in a microwave anechoic chamber. The processing results show that the proposed approach is correct and effective.