An Algorithm with Time-delay Difference for Underwater Acoustic Syn- chronous Positioning System Based on Non-equidistant Line Array

Underwater acoustic positioning system is a basic measurement system for underwater weapon test or under-water acoustic countermeasure mission. This paper presents a fast positioning method for designing underwater acous-tic synchronous positioning system for a torpedo based on horizontal non-equidistant line array positioning technology, correlation window corrected time-delay difference technology, etc., and introduces its principle and the real-time tra-jectory amendment method. Simulation with Matlab shows that this algorithm is feasible and correct. This non-equidis-tant line array positioning system has the advantages of flexible array deployment, and is economical and reliable, so it can be mounted on a wide range of array element carrier platforms. This study may provide a reference for designing torpedo’s underwater acoustic positioning systems with medium or long distance, and short or ultra-short baseline.