An improved method of impact point positioning at sea based on Beidou and dual cross-array

Ocean acoustics is an important research topic in ocean engineering. Among them, the location of the impact point at sea is an important method to evaluate the firing accuracy of naval guns. Most of the traditional methods for locating the impact point at sea use the optical positioning principle, which is expensive and has a high false alarm rate. It is easy to be affected by natural conditions, such as marine visibility. Based on this, this paper proposes an improved location method of the impact point at sea based on the Beidou differential and acoustic array, which improves positioning accuracy greatly. First, through the simulation analysis of single array positioning error, this paper gives the basis of the positioning method, then deduces the positioning principle of this method in detail, and simulates and analyzes the positioning error of the double array. Finally, the simulation experiment of the voice signal is carried out to verify the positioning performance of the dual cross-array. The results show that the direction finding of the dual cross-array is very accurate, and the ranging error is relatively large. Among the five positioning points selected in this paper, the maximum relative direction-finding error is 0.33%, and the maximum relative ranging error is only about 1%, which is much better than the ranging performance of a single array. It has certain engineering application values and provides a certain reference for the design of the impact point positioning scheme at sea.