摘要
为了实现对微弱信号的检测,提出了一种基于压频转换的相敏检波器。利用压频转换电路,将被测信号中的模拟电压值转换成频率,使用单片机根据参考信号对转换后的频率信号进行计数和数字滤波,从而实现小信号检测。分析了相关检测原理,完成了系统的软硬件设计与实现,并进行了验证实验及误差分析,结果验证了本方案的正确性和可行性。该系统原理简单、成本低廉、可靠性强、方便实用,在微弱信号检测上具有广阔的应用前景。
In order to detect weak signal,a phase sensitive detector based on voltage frequency conversion is proposed.The voltage to be measured is converted into frequency through the voltage frequency conversion circuit,and the frequency signal is counted and digital filtered by the single-chip microcomputer according to the reference signal,so as to realize weak signal detection.The related detection principle is analyzed,the hardware and software design and implementation of the system are completed,the verification experiment and error analysis are carried out,and the correctness and feasibility of the scheme are verified.The system is simple in principle,low in cost,reliable,convenient and practical,and has a broad application prospect in weak signal detection.
作者
刘文杰
李宝华
LIU Wenjie;LI Baohua(College of Electronic Science and Engineering,Jilin University,Changchun 130012,China)
出处
《吉林大学学报（信息科学版）》
CAS
2020年第3期280-285,共6页
Journal of Jilin University（Information Science Edition）
基金
吉林省科技发展计划基金资助项目(20190302010GX)。
关键词
相敏检波
压频转换
微弱信号检测
滤波
phase sensitive detection
voltage frequency conversion
weak signal detection
filter
