基于PXI总线的信号调理卡的设计  

The Design of Data Acquisition Card Based on PXI Bus

作　　者：孙吉[1] 张丕状[1] 

机构地区：[1]中北大学信息探测与处理技术研究所,山西太原030051

出　　处：《山西电子技术》2016年第1期43-45,共3页Shanxi Electronic Technology

摘　　要：在微波雷达测速当中信号会受到各种噪声的干扰以及信号的幅度不良会影响后续信号的分析,为了提高测速中前端信号处理的便捷性和优化前端信号的质量,提出了一种基于PXI总线、带有自动增益控制功能的信号调理单元的设计方案,对信号进行滤波处理并且对信号的幅度进行增益的控制,提高后续信号处理的准确性和可靠性。该调理卡分为两路通道,分别对毫米波和厘米波进行处理,通过PXI总线控制板卡上的模拟开关来实现两路通道中带宽的高速切换。实际的测试效果表明,设计的PXI信号调理卡达到的主要技术指标能够用于多普勒信号调理,满足内弹道多普勒信号采集的要求。In the microwave radar speed measurement, the signal is disturbed by various noise and the bad signal amplitude affects the subsequent signal analysis. In order to improve the convenience of front-end signal processing in speed measurement and optimize the quality of front-eng signal, a design of signal conditioning unit based on PXI bus with AGC tunction is put forward which can filter the signal, make a gain control for the signal amplitude and improve the accuracy and reliability of the subsequent signal processing. The signal conditioning card is divided into two channels, respectively, the millimeter wave and centimeter wave is processed by the an- alog switch on the PXI control bus board for the high-speed switching with two channels in the bandwidth. The actual test results show that the design of the PXI signal conditioning card which can meet the main technical indicators can be used in Doppler signal condi- tioning and meet the requirements of Doppler signal acquisition interior ballistics.

关 键 词：峰值检波电路 PXI总线 滤波器 自动增益控制 

分 类 号：TN957.51[电子电信—信号与信息处理]