基于FPGA的模/数混合采集系统优化设计

摘要

In allusion to the acquisition requirement of space environment analog quantity and image digital quantity on the missile environment,a analog-digital hybrid acquisition system based on FPGA is designed. In the system,the operational am-plifier instability of analog quantity acquisition is analyzed and optimized to increase operational amplifier compensation circuits and improve stability. In FPGA,analog-digital hybrid framing is adopted to improve data storage efficiency. Meanwhile,in allu-sion to the mismatching problem of data generation speed and transmission speed caused by speed variation of packed image sig-nal data,the dynamic balanced framing method is proposed to solve the speed matching problem. The actual flight test demon-strates that the acquisition system has reliable data output,and can meet various system performance indexes.%针对弹上环境采集空间环境模拟量和图像数字量的需求,设计一种以FPGA为核心的模/数混合采集系统.该系统对模拟量采集的运放不稳定性进行分析与优化,提高运放补偿电路的稳定性.在FPGA内通过模/数混合编帧,提高数据存储效率.同时针对图像信号压缩数据的速率变化导致数据的产生速率与传输速率不匹配问题,提出动态平衡编帧的方法解决了速率匹配问题.经实际飞行测试,该采集系统数据输出可靠,可满足系统的各项性能指标.