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| 基于锁相环的解调技术研究 | |
| 引用本文： | 罗莹,张志伟,杨宁. 基于锁相环的解调技术研究[J]. 计量学报, 2015, 36(4): 432-435. DOI: 10.3969/j.issn.1000-1158.2015.04.21 |
| 作者姓名： | 罗莹 张志伟 杨宁 |
| 作者单位： | 1.中北大学信息与通信工程学院, 山西 太原 030051; 2.浙江省通信产业服务有限公司咨询设计院, 浙江 杭州 310000; 3.中北大学电子测试技术重点实验室, 山西 太原 030051; 4.内蒙古自治区新闻出版广电局乌审854发射台, 内蒙古 鄂尔多斯 017300 |
| 摘 要： | 介绍了调相信号的锁相解调技术基本原理以及利用集成锁相环NE564实现对信号的锁相解调。为了解调出不失真的波形,利用集成锁相环NE564和LM725CN芯片设计PM调制解调系统,可以直接实现信号的调制解调功能,利用相位能稳定跟踪的特点避免了频率失锁的缺陷,提高了测量精度。该系统具有操作简单、稳定性强的优点,并在激光外差干涉信号的解调中具有较强的实用性。 |
| 关 键 词： | 计量学 锁相环 NE564 调制解调 激光外差干涉 |
Demodulation Technology Based on Phase-locked Loop |
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| LUO Ying,ZHANG Zhi-wei,YANG Ning. Demodulation Technology Based on Phase-locked Loop[J]. Acta Metrologica Sinica, 2015, 36(4): 432-435. DOI: 10.3969/j.issn.1000-1158.2015.04.21 | |
| Authors: | LUO Ying ZHANG Zhi-wei YANG Ning |
| Affiliation: | 1.School of Information and Communication Engineering, North University of China, Taiyuan, Shanxi 030051, China; 2.Consulting Services Ltd. of Zhejiang Institute of Communications Industry, Hangzhou, Zhejiang 310000, China; 3.National Key Laboratory for Electronic Meas Tech, North University of China, Taiyuan, Shanxi 030051, China; 4.Inner Mongolia Radio and Television News Publishing 854 launchers, Ordos City, Inner Mongolia 017300,China |
| Abstract: | The fundamentals of the PLL phase-modulated signal demodulation technique is described, and the integrated PLL NE564 is used to achieve lock demodulated for the signal. In order to demodulate the undistorted waveforms, the PM demodulation system using the integrated PLL NE564 and LM725CN chip is designed.The system can achieve the function of signal modulation demodulation directly and advantage of the characteristics of phase to the stability of the track to avoid the defect of the frequency lock loss, and improve the measurement accuracy.The system is simple, strong stability advantages, and has a strong practicability for heterodyne laser interferometer demodulation signal. |
| Keywords: | Metrology Phase-locked loop NE564 Modem Heterodyne laser interferometer |
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