Research on improving measurement accuracy of acoustic transfer function of underwater vehicle

• Published in: MATEC Web of Conferences Vol. 336; p. 1006
• Main Authors: Li, Jiangqiao, Jiang, Li, Yu, Fujian, Zhang, Ye, Gao, Kun
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Les Ulis EDP Sciences 2021
• Subjects: Acoustic measurement; Acoustics; Compensation; Impulse response; Least squares method; Noise; Noise measurement; Platforms; Random noise; Signal to noise ratio; Time domain analysis; Transfer functions; Underwater acoustics; Underwater vehicles
• ISSN: 2261-236X; 2274-7214; 2261-236X
• DOI: 10.1051/matecconf/202133601006

To address the problem that acoustic transfer functions with underwater platforms cannot be measured accurately, this paper presents a method based on phase compensation to improve the accuracy of acoustic transfer function measurements on underwater platforms. The time-domain impulse response signals with multiple cycles are first collected and intercepted, and then their phase differences are estimated using the least-squares method, and phase compensation is used to align the phases of all the signals, and then the impulse response signals are weighted and averaged over all the impulse response signals to cancel out the random noise. The water pool test proves that this method reduces the measurement random noise while obtaining a high-fidelity time domain transfer function, which effectively improves the signal-to-noise ratio of the measurement. The method adopts only one measurement signal, and without changing the measurement system, the random noise is cancelled out by the in-phase superposition of the multi-cycle impulse response signals to avoid the nonlinear distortion of the measurement results.