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运动目标的合成孔径雷达(SAR)成像特征是SAR地面运动目标指示(SAR/GMTI)系统进行运动目标检测、成像和重定位的基础。为此,从信号二维解耦合校正距离徙动角度推导和分析了极坐标格式算法(PFA)对运动目标的响应特性,揭示了极坐标格式转换过程中的距离插值和方位插值对运动目标距离徙动的校正原理。理论分析表明:PFA在完成对静止目标成像的同时,还能够自动校正所有运动目标的线性距离徒动,且校正过程无需目标运动信息,因此对于径向运动目标,在忽略波前弯曲条件下PFA也能够对其进行完全聚焦。最后,通过仿真数据处理对理论分析结果进行了验证,表明PFA作为一种运动目标成像预处理方法具有很大的应用前景。
Synthetic Aperture Radar (SAR) imaging features of moving targets are the basis for the detection, imaging and relocation of moving targets by the SAR Ground Moving Target Indicator (SAR / GMTI) system. Therefore, the response characteristics of polar coordinate format algorithm (PFA) to moving targets are deduced and analyzed from the angle of two-dimensional decoupling correction signal migration, and the relationship between distance interpolation and azimuth interpolation in polar coordinate format conversion to moving target distance Migration principle of correction. Theoretical analysis shows that PFA can automatically correct the linear distance of all moving targets while imaging the stationary target, and the correction process does not need the target moving information. Therefore, for the radial moving target, ignoring the wavefront bending condition, PFA It can also be fully focused. Finally, the theoretical analysis results are verified by the simulation data processing, which shows that PFA has a great potential application as a moving target imaging preprocessing method.