基于拖曳倾斜线列阵的海底反射损失提取方法

在浅海环境中，海底声学参数对水下声场的精确预报十分重要.现有的海底声学参数反演方法大多数是采用固定垂直阵进行的，其缺点是不能实施大面积、高分辨的走航式反演.在已提出的垂直阵海底反射损失反演方法的基础上，研究了基于三种线列阵阵形的海底反射损失提取方法及其特点，提出了基于拖曳倾斜线列阵与三个声源组合的走航式海底参数快速获取方法，并对该方法进行了误差分析.研究结果表明：覆盖同样的掠射角范围，垂直线列阵需与多个距离的声源组合，拖曳水平线列阵只需一个声源组合但需要采用较大的物理孔径，拖曳倾斜线列阵综合了垂直阵和水平 关键词： 水下声场预报 海底声学参数 海底反射损失 拖曳倾斜线列阵

An extraction method of seabed reflection loss based on towed tilted line array

Seabed acoustic parameters are very important to underwater acoustic field prediction in shallow water. The existing inversion methods generally uses a vertical line array to receive the signal and its platform is stationary, which can not be operated for a large area with high resolution. The methods for extracting seabed reflection losses based on three kinds of line arrays were studied. A fast inversion scheme for the seabed acoustic parameters was presented, which uses a towed tilted line array and three acoustic sources to cover a large scope of grazing angles. The error analysis was made for this method. The simulation results show that different arrays require different experimental configurations to cover the same scope of grazing angles. The vertical line array must operate with several acoustic sources and require a stationary platform of the array. The towed horizontal line array needs only one acoustic source but requires a large-aperture line array. The towed tilted line array combines the merits of the vertical line array and the horizontal line array, which can inverse the seabed acoustic parameters in a moving and high resolution way and requires only a line array of smaller aperture.