数字锁相解调器的优化设计

李勇; 刘泽; 赵鹏飞; 霍继伟; 林阳

doi:10.13700/j.bh.1001-5965.2018.0296

数字锁相解调器的优化设计

doi: 10.13700/j.bh.1001-5965.2018.0296

北京交通大学电子信息工程学院, 北京 100044

基金项目:

国家自然科学基金 61771041

详细信息

作者简介:
李勇男, 博士研究生。主要研究方向:电磁无损检测及其信号处理

刘泽男, 博士, 教授。主要研究方向:电磁层析成像

通讯作者:
刘泽, E-mail: zliu@bjtu.edu.cn

中图分类号: TG115.28;TP23
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- 被引次数: 0
出版历程
- 收稿日期: 2018-05-22
- 录用日期: 2018-07-27
- 网络出版日期: 2019-02-20

Optimal design for digital phase-locked demodulator

School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China

Funds:

National Natural Science Foundation of China 61771041

More Information

Corresponding author: LIU Ze, E-mail: zliu@bjtu.edu.cn

摘要

摘要:
数字锁相解调器是电磁无损检测中弱信号处理的重要方法，针对其性能优化，设计一种引入卡尔曼滤波器的数字锁相解调器，该解调器兼具了强抗噪能力及良好的动态跟踪响应特性。利用卡尔曼低通滤波器截止频率随迭代次数下降的特性，结合零点频率，设计了数字锁相解调器中的低通滤波环节，实现了非常窄的锁相带通，进而提高了抗击强噪声干扰能力。此外，利用卡尔曼滤波器的迭代预测-更新特点，实现了数字锁相解调器较小的响应时间，进而改善了数字锁相解调器的动态跟踪响应特性。仿真和检测实验证明所设计数字锁相解调器具有较高的抗噪能力和良好的动态跟踪响应特性，在电磁无损检测中能够精确、快速捕捉检测信号中包含的缺陷信息。
- 数字锁相解调器 /
- 卡尔曼滤波 /
- 抗噪 /
- 动态跟踪 /
- 电磁无损检测
Abstract:
Digital phase-locked demodulator is an important method for weak signal processing in electromagnetic non-destructive testing. For its performance optimization, a digital phase-locked demodulator with Kalman filter is designed, which has strong anti-noise ability and good dynamic tracking features. By using the characteristic that the cut-off frequency of Kalman low-pass filter decreases with the number of iterations and combining with the zero frequency, we design a low-pass filter in a digital phase-locked demodulator and then realize very narrow phase-locked bandpass, which improves the ability of strong noise resistance. In addition, using the predictive-update feature of the Kalman filter, the smaller response time of the digital phase-locked demodulator is realized, thereby improving the dynamic tracking characteristics of the digital phase-locked demodulator. Simulation and detection experiments show that the designed digital phase-locked demodulator has high noise immunity and good dynamic tracking response. It can accurately and quickly capture the defect information contained in the detection signal in electromagnetic non-destructive testing.
- digital phase-locked demodulator /
- Kalman filter /
- anti-noise /
- dynamic tracking /
- electromagnetic non-destructive testing

HTML全文

图 1 引入卡尔曼滤波的数字锁相解调器结构

Figure 1. Structure of digital phase-locked demodulator with Kalman filter

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图 2 卡尔曼滤波器的系统简化结构

Figure 2. Simplified system structure of Kalman filter

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图 3 不同卡尔曼增益的频率响应

Figure 3. Frequency response to different Kalman gains

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图 4 IIR低通滤波器和均值滤波器的频率响应

Figure 4. Frequency response between IIR low-pass filter and averaging filter

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图 5 卡尔曼增益随迭代次数的变化

Figure 5. Variation of Kalman gain with number of iterations

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图 6 基于卡尔曼滤波的数字锁相解调器的扫频特性

Figure 6. Frequency sweep characteristics of digital phase-locked demodulator based on Kalman filter

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图 7 不同噪声下的解调

Figure 7. Demodulation under different noises

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图 8 钢轨缺陷检测系统实验图

Figure 8. Experimental picture of rail defect detection system

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图 9 钢轨裂纹的实测数据

Figure 9. Measured data of rail crack

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图 10 3种滤波器的检测钢轨裂纹结果

Figure 10. Detection results of rail crack with three filters

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图 11 实测数据和3种解调器解调后的幅频图

Figure 11. Measured data and amplitude-frequency diagram after demodulation by three demodulators

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图 12 调节r/q比例的解调结果

Figure 12. Demodulated results while adjusting r/q

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表 1 不同噪声扰动大小以及r/q的值

Table 1. Different noise disturbance and value of r/q

编号	噪声幅值/V			SNR/dB	RC截止频率/kHz	r/q
编号	DC	干扰频率为50Hz	干扰频率为100kHz	SNR/dB	RC截止频率/kHz	r/q
1	0	0	0	30	4	10⁴
2	1	1	1	30	0.7	10⁴
3	1	1	1	10	4	10⁴
4	1	1	1	1	0.7	10⁴
5	1	1	1	1	0.7	10⁷
6	1	1	1	1	0.7	10⁹

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