Sonar micro-Doppler effect induced by ship oscillatory motion in waves: Phenomenon, model, and experimentation.

IF 1.2 Q3 ACOUSTICS JASA express letters Pub Date : 2025-02-01 DOI:10.1121/10.0035914
Minhao Wang, Cuie Zheng, Dajun Sun, Jian Xu
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Abstract

Traditional research attributes the modulated sidebands of ship radiation line-spectrum signals to reflections off rough ocean surfaces, but the Doppler effect caused by vessel motion may also contribute. This study establishes a micro-Doppler signal model based on wave-induced ship swaying, explaining that this phenomenon arises from the ship oscillatory motion in waves. The sea trial results demonstrate that the peak wave frequency, the frequency of ship micro-motions, and the micro-Doppler characteristic frequency recorded by the beacon exhibit a sudden frequency shift occurring synchronously from 0.075 to 0.115 Hz, thereby verifying the validity of the proposed model.

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