Based Tangential Movement Ranging Positioning Technology

The passive location and tracking system works using electromagnetic wave emitted by the target. It is an important issue in Electronic Warfare, for its characteristics of better concealment, positioning far and strong anti-jamming-power. With the developing of anti-radiation technology, active detection systems have encountered more and more threaten in modern electronic warfare. So the research of the passive location and tracking system is regarded increasingly in many countries, becoming the hotspot at home and abroad.In this dissertation, the technology of single observer passive location and tracking system is researched deeply. The main content of this thesis is summarized as follows:Firstly, research on the method of bearing rate of change was made. As the observability analysis and model development are the fundamental problem, they are discussed in dissertation. At the same time for different conditions of fixed target and moving emitter, emitter can be localization and be tracking by using the method.Secondly, research on the method of phase rate of change was given in the passive localization and tracking system. In the 2-D conditions, fixed target is located and tracked by using the method as well as moving emitter. Parameters'measurement accuracy deeply affects the location accuracy, so the paper particularly analyses the extracting method.At last, essentially, nonlinear filtering estimation algorithms are the key technique of the passive location and tracking system, which decide the precision and rapidity. In this paper, some considerable estimation algorithms of localization and tracking are presented, including EKF and UKF. In order to avoid the weakness of EKF algorithm, UKF algorithm in passive localization system is studied deeply. UKF has a good property in the passive localization and tracking problems. Besides the localization process is implemented easily by using UKF. At last the computer simulations are carried out and the performances of EKF and UKF are analyzed.