Bearing-only motion analysis of target based on low-quality bearing-time recordings map

Abstract

Accurate bearing-time recordings play a crucial role in hydroacoustic target motion analysis and situation estimation. The target bearing estimated by vector hydrophone in the interference environment suffers from poor display and low signal-to-noise ratio. To solve this problem, a two-stage bearing-only motion analysis method is proposed. Firstly, the bearing peak information and bearing dispersion are extracted for each sampling moment of the bearing-time recording. Custom constraint regions and adaptive parameters are then set based on this information. The order truncate average algorithm is improved to enhance the quality of the low-quality bearing-time recording map. Secondly, a bearing-only target motion model is established based on the bearing-time recording distribution features, and a bearing-time recording trust interval is constructed. Then a modified pseudo-linear estimation algorithm is proposed to solve the target motion situation information, including target abeam time, target abeam bearing, target course, velocity-to-initial-distance ratio, and so forth. Finally, by comparing the solved values of the sea trial data with the automatic identification system calculation results, the enhancement effect of the target bearing-time recording map is significant and the solving error of the target motion elements meets the needs of engineering applications.