频率域有源正交矢量型检测系统的设计  

Design of Active Orthogonal Vector Detection System in Frequency Domain

作　　者：耿丽霞[1] 许顺芳[1] 鲁永康[1] 郑彦鹏[2] 吴鹏[1] 

机构地区：[1]中国地质大学机械与电子信息学院,武汉430074 [2]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《电测与仪表》2009年第8期18-21,共4页Electrical Measurement & Instrumentation

基　　金：国家"863"计划课题资助项目(2008AA09Z203)

摘　　要：利用FPGA芯片及D/A转换器,采用直接数字频率合成(DDS)技术,产生一路正弦信号及两路正交方波信号。正弦信号经功率放大器激励待测系统,两路正交方波信号分别作为并列的相敏检波器I和相敏检波器II的参考信号,待测系统的响应与参考信号实现相关分离出虚实分量,完成了正交矢量型检测。理论及实验数据表明,该系统能检测深埋于噪声下的微弱信号,有广阔的应用前景。Based on FPGA digital frequency synthesis and A/D chip, sin wave is generated to incite the system afte （DDS） technology. Simultaneously, two orthogonal square w r power amplifier, with direct aves as referential signals for PSDI and PSDII are produced to separate the real and imaginary components of the system response by correlation. It realizes an orthogonal vector detection system. The theory and tested data prove that it can signal merged in noise, and have broad application prospects.

关 键 词：FPGA DDS 相敏检波器 微弱信号检测 

分 类 号：TM933[电气工程—电力电子与电力传动]