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Reconstruction of Signal using Interpolation

Reconstruction of Signal using Interpolation

Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...

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Pretreatment of Ultra-Weak Fiber Bragg Grating Hydrophone Array Based on Cubic Spline Interpolation Using Intensity

Yandong Pang¹, Hanjie Liu², Ciming Zhou²

¹Department of Weaponry Engineering, Naval Engineering University, Wuhan 430070, China.

Sensors (Basel, Switzerland)

|September 23, 2022

Summary

A new pretreatment method improves fiber-optic hydrophone arrays using 3x3 coupler demodulation. This technique enhances signal consistency and accuracy, significantly boosting the signal-to-noise ratio for better underwater acoustic detection.

Keywords:

cubic spline interpolation fiber-optic sensor hydrophone ultra-weak fiber Bragg gratings

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Area of Science:

Photonics
Acoustics
Signal Processing

Background:

Fiber-optic hydrophone arrays are crucial for underwater acoustic detection.
Traditional 3x3 coupler demodulation methods suffer from signal asymmetry issues.
Existing techniques often overlook the impact of signal asymmetry on demodulation accuracy.

Purpose of the Study:

To introduce a novel pretreatment method for fiber-optic hydrophone arrays utilizing 3x3 coupler demodulation.
To address and mitigate the signal asymmetry problem in traditional demodulation algorithms.
To enhance the accuracy and reliability of hydroacoustic signal detection.

Main Methods:

Employed cubic spline interpolation for nonlinear fitting of reflected pulse trains.
Calculated peak-to-peak values to determine light intensity compensation coefficients.
Utilized ultra-weak fiber Bragg gratings (uwFBGs) to construct an 800-sensor hydrophone array.
Generated low-frequency hydroacoustic signals using a vibratory liquid column method.

Main Results:

The pretreatment method demonstrated improved consistency of interference signals compared to traditional algorithms.
Cubic spline interpolation enhanced monopulse peak seeking accuracy by approximately 1 dB.
Intensity compensation reduced noise density levels by over 7 dB (at 5-50 Hz).
The overall signal-to-noise ratio improved by approximately 10 dB (at 10 Hz).

Conclusions:

The proposed pretreatment method offers significant advantages for 3x3 coupler-based fiber-optic hydrophone arrays.
This technique effectively corrects signal asymmetry, leading to more accurate demodulation.
The enhanced signal-to-noise ratio and accuracy make it suitable for advanced hydroacoustic detection systems.