Study on Doppler Spectra of Electromagnetic Scattering of Time-Varying Kelvin Wake on Sea Surface

In general, it is more practical to detect ship wake under the background of a complicated sea state than the ship directly. Thus, in this paper, the Doppler spectra of time-varying Kelvin wake on a time-varying sea surface are numerically investigated by considering the change of ship wake with tim...

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Published inSensors (Basel, Switzerland) Vol. 22; no. 19; p. 7564
Main Authors Yang, Tian-Ci, Zhao, Ye, Wu, Guo-Shan, Ren, Xin-Cheng
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2022
MDPI
Subjects
Approximation
Clutter
Doppler spectra
Electromagnetic scattering
Fluid dynamics
Investigations
Kelvin wake
Marine environment
Motion perception
Radar scattering
Radar systems
Sea states
sea surface
Spectra
time-varying
Velocity
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Summary:In general, it is more practical to detect ship wake under the background of a complicated sea state than the ship directly. Thus, in this paper, the Doppler spectra of time-varying Kelvin wake on a time-varying sea surface are numerically investigated by considering the change of ship wake with time in ocean environments. For this purpose, the linear superposition model of a time-varying sea surface and a time-varying Kelvin wake is established. Combined with the facet scattering field model of sea surface and Kirchhoff approximation (KA), the Doppler of the radar scattering echo signal of the time-varying wake on the sea surface is simulated and analyzed under different polarizations, incident angles, ship speeds, and wind speeds, as well as wind directions. It can be observed that the Doppler spectrum changes as the conditions change. This study provides a reference for extracting motion features of ship wakes in a sea clutter environment.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s22197564