Acoustic scattering feature-enhanced space-time high-resolution detection method for buried target

Detecting small submerged targets, such as sunken unmanned underwater vehicles and underwater presetting systems is paramount to protecting the marine ecological environment and waterway security. The spatial inhomogeneity of sound scattering from small targets and robust reverberation interference resulting from sound reflection from sedimentary layers contribute to a high false alarm rate and low detection efficiency, making the detection of small buried targets challenging. To solve the problem of high -probability false alarms (Pf) due to high clutter interference in the detection of buried targets with active sonar, a dynamic detection method with high spatiotemporal resolution and enhanced acoustic scattering characteristics was proposed. Based on the constraints of the sonar environment and target, the physical acoustic method is used to calculate the acoustic scattering function of cylindrical targets, construct the 2-D point spread function and replica signal matching the acoustic scattering characteristics of cylindrical targets, plan the area coverage search, verify the target path, enhance the acoustic scattering characteristics of targets, suppress reverberation interference, and dynamically detect buried targets in real-time. Experimental data processing results show that the proposed method can improve the angular and range resolutions to 0.3(degrees) and 0.01 m, respectively, improve the output signal -toreverberation ratio of the target by no less than 14 dB, and reduce Pf by more than 20 %.