双站ISAR越距离单元徙动分析与校正算法

在逆合成孔径雷达(inverse synthetic aperture radar, ISAR)成像中，当雷达分辨率较高而目标体积较大时，会产生越距离单元徙动现象。在双站ISAR成像系统中同样存在类似的问题。在双站ISAR成像模式下，对产生越距离单元徙动的原因进行了详细分析及讨论。并与单站ISAR成像中的越距离单元徙动进行了分析比较。在此基础上，采用Keystone变换的方法对解线频调后的时域信号进行处理，消除了目标像的越距离单元徙动，最后对散射点模型进行了仿真验证。

Study on correction algorithm of migration through resolution cell in bistatic-ISAR

In normal inverse synthetic aperture radar (ISAR) system, it is liable to cause the migration through resolution cell (MTRC) while the requested resolution of a radar is high and the size of targets is large. There also exists the same problem in bistatic-ISAR systems. This paper analyzes the reason of causing MTRC detailly in the module of bistatic-ISAR and compares it with the situation in mono-ISAR systems. Then under this base, an algorithm called Keystone transformation is used to dispose the time domain signal by dechirp processing, and it eliminates the MTRC in the target imaging. Finally, a simulation of scattered points is given.