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

  • 0National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin, 150001, China.
Jasa Express Letters +

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February 14, 2025

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February 14, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

Ship swaying in waves causes micro-Doppler shifts in radiation signals, not just ocean reflections. Sea trials confirmed this new model, showing a synchronous frequency shift linked to wave and ship motion.

Area Of Science

  • Oceanography
  • Signal Processing
  • Naval Engineering

Background

  • Traditional research attributes ship radiation signal modulations to ocean surface reflections.
  • The Doppler effect from vessel motion is an under-explored factor in these signal modulations.

Purpose Of The Study

  • To develop a micro-Doppler signal model for ship radiation.
  • To investigate the contribution of wave-induced ship swaying to signal modulation.
  • To validate the proposed model through sea trials.

Main Methods

  • Established a micro-Doppler signal model incorporating wave-induced ship swaying.
  • Conducted sea trials to record ship radiation signals.
  • Analyzed signal characteristics, including frequency shifts and their correlation with wave and ship motion.

Main Results

  • The study confirmed that ship oscillatory motion in waves generates micro-Doppler signals.
  • Sea trials showed a synchronous frequency shift from 0.075 to 0.115 Hz.
  • This shift correlated with peak wave frequency and ship micro-motions, validating the model.

Conclusions

  • Wave-induced ship swaying is a significant contributor to the micro-Doppler effect in ship radiation signals.
  • The proposed model accurately explains the observed frequency shifts.
  • This research offers a new perspective on analyzing ship-radiated signals in oceanic environments.