天气雷达中频数据采集系统设计

Design of Weather Radar Intermediate-Frequency Data Acquisition System

对雷达中频回波数据的高速采集与传输,需要解决两个方面的问题,一是A/D满足大动态范围,二是大容量缓存与高速传输。本文针对天气雷达60MHz中频信号,通过应用A/D欠采样技术、数字直接合成采样时钟、以动态存储器(SDRAM)为大容量缓存、64位PCI总线为高速传输,实现了中频数据采集和传输;文中详细介绍了这些关键技术的设计。本文最后A/D性能测试及采集数据的回波强度分析结果表明了方案的可行性。

For the high- speed acquisition and transfer of radar intermediate- frequency data ,two problems have to be resolved, the first is that AD converter must meet the need of large- dynamic range, the second is the large- scale buffer and high- speed transfer. Based on 60MHz intermediate - frequency signal of weather radar , by using the technology of A/D undersampling , digital- direct synthesizing sampling clock, putting SDRAM as large- scale buffer and 64 bits PCI bus as high- speed transfer ,the paper has r...