Multi Sensor-based Array Shape Direct Measurement Approach for Deep-sea Vertical Linear Array

The scale of vertical linear array (VLA) used in deep-sea is usually several thousand meters. The accurate estimation of its array is an important prerequisite for the application of VLA signal processing technology. In this paper, a deep-sea vertical array measurement method using depth sensor and azimuth sensor is proposed. Firstly, a number of depth sensors and azimuth sensors set on different depth nodes are used to obtain the tilt angle and tilt azimuth angle of deep-sea vertical array at different depth nodes. Then, through polynomial curve fitting method, the inclination angle and azimuth angle of deep-sea vertical array at different depths are recursively processed. Finally, the three-dimensional coordinate position of the deep-sea VLA is calculated, and the three-dimensional formation of the deep-sea vertical array is obtained. The experimental data processing results show that the VLA shape in a 4000-meter sea area of South China Sea may be controlled by the northeast-southwest sea current and changes at any time in a 12-hour tidal cycle, and the relative variation distance of the top of the VLA can reach 500 m at most.