Research, Based On Passive Positioning Algorithm For Underwater Sensor Networks

Active sonar has been utilized to implement the direction finding and location for underwater targets, namely initiative positioning, which has advantages like all-weather, high-precision, etc. However, this initiative system launches high-power signals, which would make the apparatus itself easy to be exposed to the enemy. System will be attacked by the electronic interference or the anti-radiation missile weapons for the consequence of exposed. So it would severely affect the accuracy of detection and even be jeopardized to the system itself. Studies of passive measurements have been researching accompanied by the innovative methods of active detection to compensate the shortage of active positioning. This paper focuses on underwater passive network detection technology with the background of continuously enhancement of stealth technology for submarines, AUVs, divers, etc., which contains the underwater passive target detection sensor network. Network nodes locate and jointly estimate the speed of underwater target by three-dimensional base array structure, and the array measurement is unaffected by the fluctuation of the underwater speed of sound, even unneeded for velocity measurements like temperature or pressure sensors. Considering the fast time and space varying characteristics of the underwater sound velocity, a novel algorithm for sound source localization based on multi-node network in the condition of uneven underwater sound speed has been proposed. With the use of a single network node to implement real-time estimate of speed and localization of underwater sound, the crucial signal processing technology for the algorithm of joint estimation has been presented. Furthermore, a study of integration for underwater network sensors has also been involved, which has a great significance on accurate location for underwater invasion in vital offshore locations and waterways.