一种基于FPGA的基-8并行脉压实现方法

A Method of Radix-8 Parallel Pulse Compression Based on FPGA

在超宽带雷达接收系统中,为了降低FPGA的处理时钟,数字正交下变频一般采用多相滤波方法实现,多相滤波后传统的一路串行零中频信号变为并行多路I/Q信号,其脉压功能通过并行多相FFT和频率抽取IFFT实现,此方法能够与数字下变频多相滤波结构统一设计,且相较于传统串行脉压实现方法,其处理效率得到有效提高,本文不仅通过理论仿真验证了改方法的有效性,而且在实际雷达中频接收模块的FPGA中实现该方法,最终在试验中完成了对试验船只的高分辨一维距离成像,进一步验证了该方法的可行性。

In the receiving system of ultra-wideband radar,in order to reduce the processing time of FPGA,digital down conversion is usually realized by polyphase filtering.In this paper,after polyphase filtering,the traditional one-way serial zero IF signal became parallel multi-channel I/Q signal,and its pulse compression function was realized by parallel polyphase FFT and frequency extraction IFFT.The proposed method can be designed together with the polyphase filters of digital down converter.Compared with the traditional method,the processing efficiency of this method has been improved.The effectiveness of the method was not only verified through theoretical simulation,but also realized in the FPGA of a real IF receiving module in a radar.Finally the HRRP of the tested ship was completed in the experiment,which further verified the feasibility of the method.