动态目标宽带雷达回波频域模拟及成像仿真

摘要

Radar echo simulation by using the method of theoretical modeling is significant to the study of radar imaging and target detection and recognition .Based on the geometric modeling for the tar-get,‘go-stop-go’ model is taken and a group of X-band stepped-frequency signals are chosen as the transmitted waveform .According to the angular relations between the target and radar at each transmission time, the RCS of target in frequency-domain is figured out by the SBR-based high frequency electromag-netic scattering calculation software which is developed by seminar .Then, according to the trajectory of target, the echo signal in frequency-domain is simulated.In addition, the echo signals of point target and F-22 model are processed by inverse synthetic aperture radar ( ISAR) imaging, and the simulation results illustrate the efficiency of the proposed method .%采用理论建模仿真的方法模拟雷达回波对研究雷达成像和目标检测识别具有重要意义。在完成空中目标几何建模的基础上，采用“走－停－走”模型，发射一组X波段的步进频率信号。根据每个雷达脉冲发射时刻目标与雷达的角度关系，用课题组自研的基于SBR的高频电磁散射计算软件计算得到目标的频域RCS。结合目标的飞行轨迹，可以模拟出频域的目标回波信号，并在此基础上对点目标和F－22模型的回波信号进行逆合成孔径雷达（ ISAR ）成像处理，成像结果验证了该方法的有效性。