基于VMD-TFA的航行状态下船载地波雷达展宽海杂波内目标检测方法OA

Under navigation state of shipborne platforms,high frequence surface wave radar systems experience severe sea clutter spreading in the echo spectrum,causing targets to be obscured within the sea clutter blind zone and significantly degrading detection performance.To address this challenge,this study proposes a novel shipborne ground wave radar target detection method for broadened sea clutter environments,based on Variational Mode Decomposition-Time Frequency Analysis(VMD-TFA).The proposed approach exploits two key discriminative features between broadened sea clutter and targets.Echo waveform characteristics-broadened sea clutter exhibits irregular,smooth waveforms,whereas target echoes demonstrate symmetry with distinct"glitch"artifacts.Time-frequency ridge properties-sea clutter shows abrupt energy amplitude variations and short-duration ridges,while target echoes maintain stable,long-term ridge continuity.Leveraging these differential characteristics,the method ef-fectively detects targets within broadened sea clutter.Validation through both simulations and measured shipborne ground wave radar data demonstrates the method's robust performance,achieving a detection rate of 90%in challenging sea clutter conditions.