Undersea Target Localization and Detection using Advanced Positioning System and Non-Linear Estimation Techniques

Tracking underwater targets is a focused application area in modern underwater defence systems. The passive target tracking using bearings-only measurements is studied for several underwater applications In under water environment, Sonobuoy receives target information in the form of acoustic energy and processes the data to get range and bearing measurements. As range measurement is not available and the bearing measurement is not linearly related to the target states, the whole process becomes non linear. But many times it is difficult to carry out maneuver by own ship due to tactical reasons.  Extended Kalman filter is used to process these noise corrupted measurements. This information about target motion parameters are communicated to the airplane by means of an UHF link and airplane releases the weapon on to the target. Results obtained in simulation are presented.