Single Airborne Observer Passive Location Based On Phase Difference Rate Of Change

In the modern electronic warfare, active location observers may be detected and attacked because of emitting electromagnetic wave. In contrast, passive location has the advantages of self-hiding and long distant detecting. Traditional single observer passive location can't meet the actual need, so seeking for new locating methods has become the hotspot of the passive location field. In this dissertation, single airborne observer passive location based on phase difference rate of change is researched, which is a novel locating method with the advantages of mobility, high speed, and hi accuracy.Several single observer passive location methods are introduced, and a method based on phase difference rate of change is studied in detail. A method of setting phase interferometers is introduced, and the equations of finding the position of the target are deduced. The observability of the method is analyzed.The ambiguity may exist in the phase difference data output by the interferometers, because the actual interferometers can only output the phase difference data in the scale of (-π;π] rad. The causation of the ambiguity is analyzed, and two methods to eliminate the ambiguity of phase difference are introduced. The double-interferometer method is proved to be better through analysis and simulation.The non-linear filtering is studied in this dissertation. Three algorithms of EKF, IEKF, and MVEKF are introduced. A method of adopting MVEKF in passive location based on phase difference rate of change is proposed and analyzed. The feasibility and validity of the method are proved by the simulating results.