Research On Bearings-only Passive Location Of Maritime Targets By Warships

The dissertation goes deep into the theory analysis and engineering practical application researches on the bearings-only passive location of maritime targets by warships. The major research works are divided into five sections, including warship bearings-only tracking maneuver research, warship bearings-only tracking research, multi-warships passive data association research, multi-warships passive location research and the engineering implementation of bearings-only passive location systems. The detailed research works are outlined as follows:(1) A method of evasion factor matrix is presented, which can add the possible patrol zone of targets (enemy's warships) according to intelligence, and the land and island information provided by electronic chart to the Modified Gain Extended Kalman Filter, and modifies state equation. It can improve the location precision of the Modified Gain Extended Kalman Filter.(2) A method of regarding the target speed constraints as additional measures and addsing it to measure equation is presented, the constraints intensity is decided by noise variance. It can improve the location precision of the Modified Gain Extended Kalman Filter.(3) Aiming at solving the divergence problom of the Modified Gain Extended Kalman Filter when bearings-only location the enemy's intermission warship emitter , a least square estimation algorithm based on variant azimuth is presented, which has the advantage of good convergence performance.(4) The necessity passive data association in multi-warships bearings-only tracking is studied, and feature association and space association algorithms is discussed. Aiming at the disadvantages of present feature association algorithm, the modified BP neutral network is applied to feature association and has a higher association rates.(5) The multi-warships bearings-only tracking algorithm is studied, it is divided into central bearings-only tracking and distributed bearings-only tracking. The two ways are compared and analyzed. The implement of direction finding cross location and errors analysis are on the focus. The multi-warships bearings-only tracking algorithm based on direction finding cross location and distributed multi-warships bearings-only tracking are also presented.(6) The observation prerequisite of single warship bearings-only tracking is analyzed, andoptimal maneuver of the observer warship is discussed.(7) The warships bearings-only passive location system and its engineering implement is researched, the operation flow and methods of over-the-horizon concealed missile attack using single and multi-warship bearings-only passive location system is presented. The direction finding data calibration and pretreatment based on uniform speed straight movement are also studied.