雷达数字下变频模块电路的主要作用是对接收到的中频回波信号进行A/D变换,并进行数字下变频处理.数字下变频(DDC:Digital Down Convert)技术是将中频信号数字下变频至零中频,且使信号速率降至通用 DSP器件能处理的速率的技术.本文介绍了一种基于FPGA的6通道数字下变频模块设计,接收6路中频模拟信号,经ADC进行模数变换后送至FPGA进行数字下变频处理,数字信号经光纤收发模块传输至信号处理单元.%The main effect of digital down conversion module circuit is A/D transformation and digitalrndown conversion of the received intermediate frequency echo. Digital down conversion technology can convertrnthe intermediate frequency signals into zero intermediate frequency signals, and can make the signal rate suitrnfor the process by general DSP device. This paper introduced a design of 6 channel digital down conversionrnmodule based on FPGA, which receives 6 intermediate frequency analog signals, and sends it to FPGA afterrnconverted from analog to digital by ADC converter. The digital signals were transmitted to the signal processingrnunit through the optical transceiver module.
展开▼
