| 频率域有源正交矢量型检测系统的设计 |
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| 引用本文： | 耿丽霞,许顺芳,鲁永康,郑彦鹏,吴鹏. 频率域有源正交矢量型检测系统的设计[J]. 电测与仪表, 2009, 46(8) |
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| 作者姓名： | 耿丽霞 许顺芳 鲁永康 郑彦鹏 吴鹏 |
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| 作者单位： | 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 |
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| 基金项目： | 国家"863"计划课题资助项目 |
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| 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.
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| 关 键 词： | 相敏检波器 微弱信号检测 |
Design of Active Orthogonal Vector Detection System in Frequency Domain |
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| GENG Li-xia,XU Shun-fang,LU Yong-kang,ZHENG Yan-peng,WU Peng. Design of Active Orthogonal Vector Detection System in Frequency Domain[J]. Electrical Measurement & Instrumentation, 2009, 46(8) |
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| Authors: | GENG Li-xia XU Shun-fang LU Yong-kang ZHENG Yan-peng WU Peng |
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| Affiliation: | GENG Li-xia1,XU Shun-fang1,LU Yong-kang1,ZHENG Yan-peng2,WU Peng1(1.Institute of Mechanical , Electronic Information,China University of Geosciences,Wuhan 430074,China. 2.First Institute of Oceanograply,Qingdao 266061,Sh,ong,China) |
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| Abstract: | Based on FPGA and A/D chip,sin wave is generated to incite the system after power amplifier,with direct digital frequency synthesis(DDS) technology.Simultaneously,two orthogonal square waves as referential signals for PSDI and PSDII are produced to separate the real and imaginary components of the system response by using cross correlation.It realizes an orthogonal vector detection system.The theory and tested data prove that it can detect weak signal merged in noise,and have broad application prospects. |
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| Keywords: | FPGA DDS |
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