合成孔径雷达实时距离徙动校正算法研究

Study on SAR real-time range migration correction algorithm

对于合成孔径雷达(synthetic aperture radar,SAR)信号处理,特别是SAR实时信号处理,徙动校正算法是非常关键的一个步骤。一方面,徙动校正处理算法的性能直接影响最终的成像质量;另一方面徙动校正处理的运算量也关系着整个处理系统的设备量、实时性。给出了目前几种常用的SAR处理算法中距离徙动校正的方法,结合计算机仿真方法,分析了在实时处理环境下各方法的误差性能与运算量,并最终得到结论:对于实时处理,多项式插值方法是较好的选择。

The range migration correction algorithm is a key step for synthesis aperture radar （SAN） signal processing, especially for real-time SAR processing. The performance of range migration correction algorithm influences the quality of the final image directly. The computation performance of range migration correction process is related to the real-time performance and device quantity of the whole processing system as well. Several range migration correction approaches used in current popular SAR processing algorithms are presented.The error and computation performance of each approach are analyzed in real-time processing circumstance. The result leads to the conclusion that polynomial interpolation is the best choice for real-time SAR range migration correction processing.