Phase Generated Carrier Demodulation Approach in Fiber-Optic Hydrophone Based on Extended Kalman Filter Parameter Estimation

Fig. 4. Estimated results of four demodulation model parameters. (a) Estimated result of parameter D; (b) estimated result of parameter E_x/E_y;(c) estimated result of parameter sin(θ_x－θ_y); (d) estimated result of parameter cos(θ_x－θ_y)

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Fig. 5. Demodulation results of PGC-Atan method. (a) Time domain demodulation result of PGC-Atan method and its partial enlargement; (b) frequency domain demodulation result of PGC-Atan method and its partial enlargement

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Fig. 6. Demodulation results of PGC-EKF method. (a) Time domain demodulation result of PGC-EKF method and its partial enlargement; (b) frequency domain demodulation result of PGC-EKF method and its partial enlargement

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Fig. 7. Schematic of experimental device

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Fig. 8. Physical drawing of experimental device

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Fig. 9. Original signal waveform received by the computer and its partial enlargement

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Fig. 10. Demodulation results of PGC-Atan method. (a) Time domain demodulation result; (b) frequency domain demodulation result; (c) partial enlargement of frequency domain demodulation result

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Fig. 11. Demodulation results of PGC-LSM method. (a) Time domain demodulation result; (b) frequency domain demodulation result

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Fig. 12. Demodulation results of PGC-EKF method. (a) Time domain demodulation result of PGC-EKF method; (b) frequency domain demodulation result of PGC-EKF method

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Table 1. Parameters used in simulation of PGC-EKF
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Table 1. Parameters used in simulation of PGC-EKF
Type of parameters Value
Sampling frequency /kHz 250
Carrier frequency /kHz 25
Frequency of φ(t) /Hz 500
Amplitude of φ(t) /rad 1
${\hat{x}}_{0}$ [1 1 1 1 1]^T
${\hat{P}}_{0}$ diag1(1 1 1 1)
Q_n 2.5×10^－7
γ 0.999
N 20000
M 1040000

Table 2. Relative estimation error and mean square error of estimation results of four demodulation model parameters
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Table 2. Relative estimation error and mean square error of estimation results of four demodulation model parameters
Parameter Relative estimation error /% Mean square error /10^－10
D 0.07 1.00
E_x/E_y 0.39 38
sin(θ_x－θ_y) 0.59 5.7
cos(θ_x－θ_y) 0.28 2.69

Table 3. SNR, THD and SINAD of demodulation results of PGC-Atan and PGC-EKF methods
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Table 3. SNR, THD and SINAD of demodulation results of PGC-Atan and PGC-EKF methods
Algorithm SNR THD SINAD
PGC-Atan 52.78 －16.25 16.25
PGC-EKF 54.69 －63.18 54.12

Table 4. SNR, THD and SINAD of demodulation results of PGC-Atan, PGC-LSM and PGC-EKF methods
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Table 4. SNR, THD and SINAD of demodulation results of PGC-Atan, PGC-LSM and PGC-EKF methods
Algorithm SNR THD SINAD
PGC-Atan 21.29 －9.56 9.28
PGC-LSM 29.22 －15.25 15.08
PGC-EKF 30.13 －28.81 26.44

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Nanqi Chang, Xiaodi Huang, Haibin Wang. Phase Generated Carrier Demodulation Approach in Fiber-Optic Hydrophone Based on Extended Kalman Filter Parameter Estimation[J]. Chinese Journal of Lasers, 2022, 49(17): 1709001

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Paper Information

Category: holography and information processing

Received: Nov. 23, 2021

Accepted: Jan. 13, 2022

Published Online: Jul. 28, 2022

The Author Email: Huang Xiaodi (huangxd@mail.ioa.ac.cn)

DOI:10.3788/CJL202249.1709001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Parameters used in simulation of PGC-EKF

Table 1. Parameters used in simulation of PGC-EKF

Table 2. Relative estimation error and mean square error of estimation results of four demodulation model parameters

Table 2. Relative estimation error and mean square error of estimation results of four demodulation model parameters

Table 3. SNR, THD and SINAD of demodulation results of PGC-Atan and PGC-EKF methods

Table 3. SNR, THD and SINAD of demodulation results of PGC-Atan and PGC-EKF methods

Table 4. SNR, THD and SINAD of demodulation results of PGC-Atan, PGC-LSM and PGC-EKF methods

Table 4. SNR, THD and SINAD of demodulation results of PGC-Atan, PGC-LSM and PGC-EKF methods