Research On Target Tracking For INS/Passive Radar/SAR Composite Seeker

The utilization of multi-mode composite guidance is an important way of improving antiship missiles' penetration ability and accurately hitting ability. This paper takes the research of the INS/Passive Radar/SAR seeker as background, goes deep into the research on ship target's location and tracking problem.The thesis firstly summarized the status quo of the antiship missile that using composite guidance mode and the target location technique. Then analyzes the operating course of the INS/Passive Radar/SAR seeker, and simply introduces the major content of this article.According to the INS/passive radar composite guidance mode used in the midcourse, a ship target's tracking method using the phase rate of change is proposed, then the location and tracking precision in midcourse is improved. Firstly introduces the location theorem of the phase rate of change method, then the effectiveness of the tracking method proposed is verified by way of the simulation, afterwards an analysis of the performance of the algorithm is taken.In order to raising the terminal guidance precision, the paper takes a further research on the target location problem in the terminal course. A passive radar/SAR composite location algorithm was proposed combining the angles given by the passive radar and the range and range rate given by SAR imaging process, and the UKF method is applied in the location course, realizes the quick and accurately location of the target. Simulation result demonstrates that the algorithm used has high location precision, UKF filter converging quick and stably, it can improve the location and tracking precision effectively.The last section summarizes the main work of the thesis, and points out the problems that need go a step further to research.