您的位置：山东大学 -> 科技期刊社 -> 《山东大学学报（工学版）》

山东大学学报 (工学版) ›› 2019, Vol. 49 ›› Issue (4): 24-28.doi: 10.6040/j.issn.1672-3961.0.2018.526

• 机器学习与数据挖掘 • 上一篇    下一篇

基于全数字移相锁相法的微弱信号检测器

王璐(),王红*(),陈国平   

  1. 重庆邮电大学光电工程学院, 重庆 400065
  • 收稿日期:2017-09-04 出版日期:2019-08-20 发布日期:2019-08-06
  • 通讯作者: 王红 E-mail:luwang@cqupt.edu.cn;892086798@qq.com
  • 作者简介:王璐(1984—)，男，四川达州人，讲师，博士,主要研究方向为光伏太阳能电池相关技术.E-mail:luwang@cqupt.edu.cn
  • 基金资助:
    重庆市教委科学技术研究资助项目(KJ1600432);重庆市教委自然科学基金资助项目(KJ130507)

Weak signal detector based on all-digital phase-shifting lock-in method

Lu WANG(),Hong WANG*(),Guoping CHEN   

  1. School of Optoelectronic Engineering, Chongqing University of Post and Telecommunications, Chonqging 400065, China
  • Received:2017-09-04 Online:2019-08-20 Published:2019-08-06
  • Contact: Hong WANG E-mail:luwang@cqupt.edu.cn;892086798@qq.com
  • Supported by:
    重庆市教委科学技术研究资助项目(KJ1600432);重庆市教委自然科学基金资助项目(KJ130507)

RichHTML

7

PDF (PC)

555

摘要：

为改善现有相关锁相检测的相位差不可控性,克服模拟移相电路易受干扰、功耗大等缺点,提出一种基于全数字移相锁相的微弱信号检测方法,将一路模拟相关信号改进为具有频率遍历和同频移相的全数字参考信号,结合锁相相关检测对低信噪比(signal noise ratio, SNR)的微弱信号进行提取。利用直接内存存取(direct memory access, DMA)技术传输参考信号和待测微弱信号,并通过模数转换器(analog to digital converter, ADC)和数模转换器(digital to analog converter, DAC)实现高速率、低功耗的同频数据转换。测试表明,在90 dB的强噪声环境下,该方法可检测有效稳定的最低SNR为-46 dB的微弱信号,可对高噪声环境的工业厂房的无源扬声器进行高精度质量检测。

关键词: 微弱信号检测, 质量检查, 全数字移相, 锁相放大器, 低信噪比

Abstract:

In order to solve the problem of the uncontrollable phase difference in existing lock-in detection and the vulnerable to interference or high power consumption in analog phase-shifting circuit. The lock-in detection equipment based on all-digital phase-shifting method was designed, which the analog correlation signal was replaced by an all-digital reference signal with frequency traversal and co-frequency shift, then combined with the lock-in correlation detection to extract weak signals in low SNR. The reference signal and the weak signal to be tested were transmitted by direct memory access(DMA), the analog to digital converter(ADC) and digital to analog converter(DAC) were used to realize the transmission of synchronous frequency data with low power and faster transfer speed. The results showed that the lowest SNR detectable by this method was -46 dB with good stability and efficiency in a strong noise environment of 90 dB. It had great practical value for high-precision quality testing in high noise environment passive speaker equipment of the industrial plant.

Key words: weak signal detection, quality inspection, digital phase-shifting, lock-in amplifier, low SNR

中图分类号: 

  • TP206

图1

系统框图"

图2

产生1 kHz正弦激励信号流程图"

图3

系统代码流程图"

图4

同频移相正弦参考信号"

图5

1 kHz正弦波激励信号"

图6

检测器实物图"

图7

90 dB环境噪声模拟场景下的检测结果"

图8

无噪声时的检测结果"

表1

纯噪声测试结果"

NOISE/V MAX PAPR
4.2 62 1.41
3.5 44 1.83
3.2 35 1.81
3.0 30 2.41
2.0 13 3.25

表2

90 dB噪声和1 kHz输入信号混合测试结果"

INPUT/V SNR/dB DC/mV MAX PAPR
4.20 0 0~600 74 1.68
2.00 -6 0~450 64 1.70
1.00 -13 0~340 61 1.69
0.50 -19 0~200 53 1.67
0.20 -26 0~100 52 1.62
0.10 -33 0~56 48 1.75
0.05 -40 0~30 40 1.68
0.03 -43 0~15 35 1.65
0.02 -46 0~6 16 1.64
1 DU Peng , TAO Hongtao , GAO Baocheng , et al. General data acquisition for a multi-application aspect[J]. Automation of Electric Power Systems, 2015, (1): 26- 30.
2 YU Jiaxu , SUN Zhengbo , HE Qing , et al. Multi-station TDOA-based Collaborative detection of weak signal[J]. Telecommunication Engineering, 2017, 57 (4): 425- 429.
3 HE Yujie , LI Ming , ZHANG Jinli , et al. Infrared small target detection method based on correlation filter[J]. Acta Optica Sinica, 2016, 36 (5): 96- 104.
4 CHEN Yuze , XING Weiwei , FAN Shangchun . Implementation of orthogonal vector digital lock-in amplifier based on DSP Builder[J]. Modern Electronics Technique, 2015, 38 (1): 62- 65.
5 TU Yaqing , SHEN Yanlin , SHEN Tingao , et al. Phase and frequency matching based phase difference estimation method for non-integer periods sampling signals[J]. Journal of Vibration & Shock, 2017, 36 (6): 7- 10.
6 GUO Lichao , LIAN Baowang , MA Zhaoxia . A fast acquisition algorithm for weak GPS signal[J]. Modern Electronics Technique, 2011, 34 (15): 74- 78.
7 SHEN Tingao , TU Yaqing , LIU Xiangyu , et al. Research on phase difference measurement for non-integer period sampling signal based on correlation theory[J]. Chinese Journal of Scientific Instrument, 2014, 35 (9): 2153- 2160.
8 LIU Weidong , LIU Shanghe , HU Xiaofeng , et al. Aperiodic weak partial discharge source detection based on accumulation of cross correlation estimation infor-mation[J]. High Voltage Engineering, 2017, 43 (3): 966- 972.
9 ZHANG Yue , LIU Shanghe , LIU Weidong . Detection of weak transient electromagnetic signals based on generalized cross correlation and chaotic time series prediction integrate algorithm[J]. Journal of Electronics & Information Technology, 2015, (11): 2769- 2775.
10 CHEN Sixiong , YI Longqiang , HUANG Wenjun , et al. Single-phase phase-locked technique based on constructing non-orthogonal vector[J]. Transactions of China Electrotechnical Society, 2019, 34 (2): 398- 408.
11 龚宇雷, 王辉, 李庆民. 锁相环动态频相跟踪特性分析[J]. 山东大学学报(工学版), 2008, (4): 107- 112.
GONG Yulei , WANG Hui , LI Qingmin . Analysis of the dynamic frequency-and phase-tracking characteristics of phase-locked loop[J]. Journal of Shandong University(Engineering Science), 2008, (4): 107- 112.
12 SHEN Tingao , TU Yaqing , LI Ming , et al. An improved method for phase difference measurement based on correlation theory[J]. Journal of Vibration & Shock, 2014, 33 (21): 177- 182.
13 LU Liqian , LI Zengyong , CUI Ruofei , et al. Design of pre-amplifier circuit on blood alcohol detection based on NIR[J]. Journal of Shandong University(Engineering Science), 2014, 44 (3): 64- 68.
14 GAO Feng , ZHU Pingping , YI Xi , et al. Methodology on optical topographic mapping based on multi-wavelength lock-in detection[J]. Journal of Tianjin University, 2013, 46 (2): 162- 167.
15 张晓莉, 全伟, 刘刚. 基于高调制频率的双通道数字锁相算法[J]. 山东大学学报(工学版), 2017, 47 (5): 173- 178.
ZHANG Xiaoli , QUAN Wei , LIU Gang . Dual-channel digital lock-in algorithm based on high-modulation frequecy[J]. Journal of Shandong University(Engineering Science), 2017, 47 (5): 173- 178.
16 LIU Jianfei , WANG Shaoying , ZENG Xiangye , et al. PAPR reduction method for CO-OFDM system based on improved bat algorithm[J]. Acta Photonica Sinica, 2016, 45 (10): 56- 61.
17 LI Zewen , SHU Lei , DENG Feng , et al. Wholly DPLL-based synchronous clock with high precision for electric power system[J]. Electric Power Automation Equipment, 2015, 35 (7): 32- 36.
18 CHAO Qi, HUANG Yiyi, ZHANG Wensheng, et al. Design of dual-phase lock-in amplifier used for weak signal detection[C]//IECON 2016-42nd Annual Conference of the IEEE Industrial Electronics Society. Florence, Italy: IEEE, 2016: 883-888.
19 WANG Gaoxuan , REBOUL S , CHOQUEL J B , et al. Circular regression in a dual-phase lock-in amplifier for coherent detection of weak signal[J]. Sensors, 2017, 17 (11): 2615- 2630.
doi: 10.3390/s17112615
[1] 张晓莉,全伟,刘刚. 基于高调制频率的双通道数字锁相算法[J]. 山东大学学报(工学版), 2017, 47(5): 173-178.
[2] 穆峰, 常发亮, 蒋沁宇. 基于改进EMD算法的信号滤波[J]. 山东大学学报(工学版), 2015, 45(3): 35-42.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] 张永花,王安玲,刘福平 . 低频非均匀电磁波在导电界面的反射相角[J]. 山东大学学报(工学版), 2006, 36(2): 22 -25 .
[2] 浦剑1 ,张军平1 ，黄华2 . 超分辨率算法研究综述[J]. 山东大学学报(工学版), 2009, 39(1): 27 -32 .
[3] 孙国华,吴耀华,黎伟. 消费税控制策略对供应链系统绩效的影响[J]. 山东大学学报(工学版), 2009, 39(1): 63 -68 .
[4] 王静,李玉江,张晓瑾, 毕研俊,陈位锁 . 粉煤灰去除水中活性紫KN-B[J]. 山东大学学报(工学版), 2006, 36(6): 100 -103 .
[5] 孙玉利,李法德,左敦稳,戚美 . 直立分室式流体连续通电加热系统的升温特性[J]. 山东大学学报(工学版), 2006, 36(6): 19 -23 .
[6] 李辉平, 赵国群, 张雷, 贺连芳. 超高强度钢板热冲压及模内淬火工艺的发展现状[J]. 山东大学学报(工学版), 2010, 40(3): 69 -74 .
[7] 薛翊国，李术才，赵岩，苏茂鑫，李为腾，丁志海. 青岛胶州湾海底隧道F44含水断层注浆前后TSP探测分析[J]. 山东大学学报(工学版), 2009, 39(2): 108 -112 .
[8] 张恭孝,杨荣华 . 水杨醛缩甲基氨基硫脲Schiff碱配合物的合成与表征[J]. 山东大学学报(工学版), 2008, 38(3): 108 -111 .
[9] 蔡晓军１ ,张擎１ ,柴乔林１ ，孔苏丽2 . 基于能量均衡的n分多路径路由算法[J]. 山东大学学报(工学版), 2009, 39(2): 141 -145 .
[10] 薛成骞,董建文,孟宪锋,常虹,曹宁,陈华英,李木森 . C／C+HA骨植入材料对杂交波尔山羊生理生化机能的影响[J]. 山东大学学报(工学版), 2008, 38(3): 73 -76 .
版权所有 © 2018 《山东大学学报(工学版)》编辑部　
地址: 济南市山大南路27号（250100）　 电话: 0531-88366735　 E-mail: xbgxb@sdu.edu.cn
本系统由北京玛格泰克科技发展有限公司设计开发