Trail Measurement For Disoperative Moving Target In Near Area

The measuring system for high speed moving targets nearby usaully always works on coperative mode years ago. Though some systems can work on disoperative moving mode, the precision of them is not satisfactory. Compared with operative target measuring system, disoperative target measuring system works more conveniently on the sea, so the navy needs a disoperative target measuring system that can track underwater targets moving in high speed precisely. The dissertation gives a research on design of a disoperative target measuring system.Through both sides of display-control computation and signal processing, the dissertation suggests a new method and discusses realization of it. In the aspect of display-control computation, the orientation principle and mathematics model of asynchronous tracking system are emphasized. According to linear and nonlinear arithmetic, the dissertation expatiates the formula for positioning computation when targets' depths are unknown, and gives proofs of its precise estimation of time delay by simulation. In the aspect of signal processing, a high precision time delay estimating method is suggested, which contains the signal processing methods of coarse time delay difference measure, adaptive frequency estimation, adaptive phase difference estimation , signal grouping and so on. Besides, the dissertation discusses the phase wrapped problem existing in short base line orientation systems, and adopts vector sensor to solve it. The method is proved to be efficient by simulation on Matlab kit.The simulation result shows that the disoperative target moving in high speed measure technique designed in the dissertation is precise enough to be used in engineering.