| Citation: | LI Yong, LIU Ze, ZHAO Pengfei, et al. Optimal design for digital phase-locked demodulator[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(2): 299-308. doi: 10.13700/j.bh.1001-5965.2018.0296(in Chinese)
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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.
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