一种全实时SAR方位向数字预处理滤波器的设计

利用机载SAR方位向预处理的基本原理，巧妙地将方位向FIR滤波和降采样相结合，从而提出了一种SAR方位向预处理实时快速算法的VLSI结构，并利用HDL语言将该结构综合在了一片大规模CPLD上，得以硬件实现，外围辅助其它单元电路，研制成功了面向地学高分辨率机载SARY方位向预处理分机。经过使用证明，该分机可以适用于多种波段的机载SAR系统，达到了满意的处理效果。

DESIGN OF A REAL-TIME SAR AZIMUTH DIGITAL PREPROCESSING FILTER

This paper introdces a real-time fast algorithm for the SAR signal preprocessing from the classical FIR in-out equation. It combines azimuth filtering with desampling and results in a special VLSI architecture for the real-time preprocessing of airborne SAR signal. The architecture is synthesized into a large scale CPLD and occupies about 56 percent of 10000 logic gates. With the peripheral function module together, a real-time preprocessing of SAR signal subsystem is built. This subsystem has been fully tested by the real X band airborne SAR flying experiment in Xi'an in Sept. 2001 and L band airborne SAR ground simulative system. These experiments show that the filter and the subsystem have sound adaptability for different SAR systems. The results are satisfactory.