基于斜视成像几何模型,分析了目标回波信号距离走动比距离弯曲大得多的特点。推导了用于机载大斜视合成孔径雷达成像的改进距离-多普勒算法。该算法基于高阶距离模型,首先在距离压缩时校正距离走动,然后在两维频域校正距离弯曲。点目标仿真和实测数据成像结果证明了算法的可行性。

Based on the imaging geometry of squint mode,the characteristics of echoes in squint mode are analyzed in this paper.The result is that range walk is much larger than range bending,and a modified range-Doppler(RD) algorithm suitable for airborne highly squint mode imaging is derived.This algorithm is based on high-order range model,which firstly corrects range walk in the process of range compression and then corrects range bending in two dimensional frequency domain.The imaged results of simulation and Radar data both demonstrate the feasibility of the algorithm proposed in this paper.

TN958