Precision Airborne Single Observer Passive Location

Passive locating methods have the advantages of far distance, concealable receiving and low probability to be detected, compared to active locating methods. So, passive locating system can contribute much to improve viability and battle effectiveness of the whole system in the electronic war environment. Single-observer passive locating method has a wider applicable prospect as a rising locating resort with well flexibility.In this paper, the technical characteristics of several existing passive locating methods are introduced and analyzed, and the method of a single airborne observer based on phase difference rate of change is discussed. Furthermore, the related key techniques of the method are mainly discussed. Firstly, the ambiguity of phase difference measurement data is analyzed, then the principles and realization of two resolving methods are researched comprehensively, and some pertinent computer simulations are done to validate the two methods. Subsequently, the methods of acquiring corresponding phase difference rate of change are studied deeply. Besides, smoothness and filtering of the locating results for fixed targets, and evaluation of the velocity and position of uniform motion targets are respectively analyzed, and the application of MVEKF algorithm to the passive locating system with phase difference rate of change is presented, then, the MVEKF equations are deduced and computer simulation results show the validity of this algorithm. Lastly, two digital phase difference measurement methods are introduced in detail, and computer simulation results show that the two methods have high precision. The results of this thesis are meaningfull in some extent to single observer passive locating technology.