Research on Anti-Phase Ambiguity Method for High Frame Rate Ultra-Short Baseline Location System

The underwater acoustic location technique takes advantage of the long-distance propagation of underwater sound wave. With the help of transponder array, buoy or base array which placed in the already known position underwater, on the water or on hull, it can measure the propagation delay, phase difference and more of the acoustic signals that emitted by the target and the location of the target is calculated through geometrical principles. For systems operating at higher frequencies, due to the limitation of physical processes, the spacing of array elements is difficult to satisfy the constraint of half-wave spacing, and the traditional anti-phase ambiguity method is invalid. In order to solve this problem, an anti-phase ambiguity algorithm based on maximum a posterior criterion is investigated. After analyzing the feasibility of the algorithm in theory, the engineering implementation method is given. Then we discuss the influence of array on this method, and verify the accuracy of the method by simulation.