Using High-Order Particle Velocity Gradient Polarization Characteristics to Detect Underwater Coherent Interference

Detection of underwater coherent interference is necessary as its presence affects the estimation of the desired target. In this work, a method based on high-order particle velocity gradient polarization characteristics is proposed to distinguish the presence of coherent interference. Characteristics including ellipse ratio and inclination angles of the high-order particle velocity gradient are chosen as effective detection features because they remain unchanged at different orders of the desired target but changed at different orders of coherent signals when there is coherent interference. Based on such altered properties, a quick and effective marine detection system can be established. Both simulation and experimental results validate the proposed detection method.