基于多DSP的机载SAR距离徙动校正实现方法

Implementation of Range Cell Migration Correction for Airborne SAR Based on Multi-DSPs

针对机载合成孔径雷达(SAR)数据量大、运算复杂、实时性能要求高等问题,提出了一种基于多片多核DSP并行的方式实现机载SAR距离徙动校正的方法。重点介绍实现过程中的片间及片内并行和同步处理、数据交互、数据分配,距离徙动校正的距离向脉冲压缩和惯导补偿,以及多普勒中心估计实现的具体步骤,利用点仿真和实测数据验证了该方法的有效性,并提出优化模块,进一步提高运算的实时性。

In view of the shortcomings of airborne synthetic aperture radar(SAR)imaging such as large amount of data,complex computation,and high real-time performance requirements,an implementation method of range cell migration correction for airborne SAR is proposed based on parallel multi-chip and multi-core DSPs. First,the technology involved in the implementation process is given,e. g.,the parallel and synchronous processing,data interaction,and data distribution of inter-chips and inter-cores. Then,the implementation algorithm of range cell migration correction for airborne SAR is described in detail. Finally,the effectiveness of the proposed algorithm is proved by simulation and experimental data. Besides,an optimal module is put forward to further improve the real-time performance of DSP processing.