三维前视声呐信号处理方法
Signal processing method for 3D forward-looking sonar

三维前视声像声呐是安装在小型水下载体上的重要声学探测设备。提出了基于波达方向估计技术的三维前视声呐信号处理方法, 接收阵水平方向采用波束形成技术, 垂直方向采用波达方向估计技术。在波束内采用分裂孔径相位法提高水平方向分辨率, 形成声呐阵前方的三维声像。仿真结果和水池实验结果表明:在接收阵面面积相同的条件下, 能够获得优于常规技术的分辨率, 可以实现点目标和连续目标的探测, 适合于在水下载体上安装使用。
A signal processing method for 3D forward-looking Sonar based on Direction of Arrival Estimation is presented. Beamforming is used in horizontal direction of the receive array, and DOA estimation is employed in vertical direction. Phase estimation is also implemented to improve the resolution in horizontal direction for detecting continuous target. Finally the 3D image in the front of sonar array is formed. The results of tests show that the method can get higher resolution than the sonar using beamforming with the same area of receiver array. The sonar using the method is more suitable for underwater vehicles.