基于FPGA的窄带多通道数字脉压设计

Design of Narrowband Multi-Channel Digital Pulse Compression System Based on FPGA

在雷达窄带系统中,对多通道、多带宽中频接收信号的处理,通常在数字中频接收系统中基于FPGA芯片完成数字下变频和基带数据打包,再由信号处理系统基于DSP芯片进行数字脉压等。而FPGA具有处理速率快和并行运算能力强的特点,使得基于FPGA的线性调频信号数字脉压比DSP具有更大优势。将基带信号数字脉压由信号处理系统提前到数字中频接收系统,在单片FPGA内实现多通道、多带宽、多数据率窄带系统数字下变频、数字脉压和数据打包的一体化设计,能够有效减轻信号处理系统对基带信号的运算压力。

In the radar narrowband system,for the processing of the multi-channel,multi-bandwidth IF receive signals,the digital down conversion（DDC）and baseband data package are usually made based on field programmable gate array（FPGA）in the digital intermediate frequency（IF）receiving system,and then the digital pulse compression is performed based on digital signal processor（DSP）in the signal processing system.High-speed processing and parallel computing of the FPGA make the digital pulse compression of linear frequency modulation signal based on FPGA better than DSP.The digital pulse compression is moved up from the signal processing system to the digital IF receiving system and the integrated design of the DDC,digital pulse compression and data package of the multi-channel,multi-bandwidth,multi-rate narrowband system is realized in only one FPGA,which can reduces the processing pressure of the signal processing system.