Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (4): 24-28.doi: 10.6040/j.issn.1672-3961.0.2018.526

• Machine Learning & Data Mining • Previous Articles     Next Articles

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)

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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

CLC Number: 

  • TP206

Fig.1

System diagram"

Fig.2

Flow chart for generating 1 kHz sinusoidal excitation signa"

Fig.3

Flow chart for system code"

Fig.4

The refrence signal with co-frequency shift"

Fig.5

The 1 kHz sinusoidal excitation signal"

Fig.6

The detector prototype"

Fig.7

Detection results of 90 dB noise"

Fig.8

Detection results of pure noise"

Table 1

Test results of pure noise"

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

Table 2

Test results of 90 dB noise and the 1 kHz sine"

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
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