Research On Single Observer Passive Location Algorithm Base On Rotating Interferometer

With the rapid development of electronic reconnaissance technology in recent years,the traditional single-station passive location technology can hardly meet the actual needs in terms of its localization speed and accuracy.The exploration of the new system's localization method has become a research hotspot in the passive location field.Therefore,this thesis mainly studies the single-station passive location technology using the rotation interferometer to measure the rate of change of phase difference.Firstly,this thesis analyzes the research value and research significance of passive location technology,introduces the development history and research status of passive location technology at home and abroad,and classifies the single-station passive location technology,and also includes the target parameters contained in the target radiation source.The information is analyzed.At the same time,several traditional localization methods,the use of phase difference change rate localization method and Doppler frequency change rate localization method are introduced.Secondly,the single-station passive location using the interferometer baseline to measure the rate of change of phase difference is studied.Firstly,the direction finding principle of the phase interferometer and the direction-finding ambiguity produced by the interferometer in the direction finding process are analyzed.A rotating baseline interferometer direction finding method is verified by simulation experiments.This method has a good direction-finding accuracy;and then a single station passive localization method for a fixed interferometer of a moving observation station is studied.The three aspects of positioning principle,positioning line,and positioning performance is analyzed in detail.Simulation experiments are conducted on the GDOP distribution under typical scenarios.The effects of different positions of the interferometer on location errors are compared,and a typical interference is analyzed.In the case of instrument installation,the effect of observation platform maneuver on localization error is compared.The advantages and disadvantages of least square method and grid search method in solving the target position are compared.Finally,the maximum likelihood function grid search method is used to locate the target radiation source.Finally,aiming at the self-rotation of the interferometer in the maneuvering process of the observation platform,this thesis proposes a single-station passive localization method based on the rotating interferometer of the motion observation platform.The interferometer is no longer fixed on the observation platform,but follows the observation platform maneuver,and itself to rotate.Build a rotation baseline localization model,deduce the positioning principle theoretically,and analyze the positioning performance of the method.The Cramer-Rao Lower Bound(CRLB)of localization error of the method is deduced,and different typical scenes are simulated.Under the localization error distribution,finally obtain the interferometer to follow the observation platform to do some maneuvering at the same time,the interferometer baseline selection of the appropriate speed can improve the positioning performance of this conclusion.