距离走动补偿优化及FPGA实现

Optimization and FPGA Implementation of Move Distance Compensation

径向匀速目标在长时间积累时,回波包络会发生走动,造成能量分散在不同距离单元,影响积累性能。在分析距离走动补偿的原理和常用方法的基础上,对距离走动补偿算法进行优化,提出了抽取移位补偿方法,通过整数阶和小数阶的联合补偿降低了运算量。给出了抽取移位补偿方法的FPGA实现,并结合FPGA芯片的特点对其运算结构进行了优化。最后结合一种长时间积累雷达进行了算法的验证,测试结果表明该优化方法能够取得长时间相参积累的优良信噪比。

A constant speed radial target during longer periods to accumulate, walking echo envelope will occur, and then cause energy dispersion at different distances and affect accumulation unit performance. On the analysis of the principles and common methods of the move distance compensation, the compensation of range migration algorithm is optimized, the method of sampling shift is proposed. This method could reduce the hardware resources by joint compensation of integer order and fractional order. The FPGA implementation of this method is proposed and the optimization of the operation structure is given. Finally the realization of this sampling shift method is completed, the test result shows that the optimi- zation method can achieve excellent SNR results after coherent accumulation.