Research On New Methods Of Electronic Reconnaissance Fusion Localization Based On Low Orbit Dual-satellite

TDOA/FDOA localization method for locating an emitter on earth using low orbit dual-satellite is widely researched due to large range of reconnaissance and high localization accuracy.But the localization accuracy near the subsatellite track is bad and there exists ambiguous localization result.As phase interferometer also exists low system complexity and locates an emitter fast.The high accurate and high reliable localization result can be obtained by fusing the emitter's Direction of arrival obtained via adding a phase interferometer on the primary satellites with TDOA and FDOA.This paper focuses the problems of the localization solution fusing TDOA/FDOA and interferometer,which is called ‘fusion location system' throughout the remain part of the thesis,including: 1)fusion localization algorithm and localization error analysis,2)ambiguity resolution algorithm,3)the problem of locating and tracking the moving target with known altitude and target motion detection,etc.our research contents can support and promote the applications of the hybrid location system.The detailed research work about fusion location we focused on includes:The second chapter studies the fusion localization algorithm based on dual-satellites.First,we formulate fusion localization model.Then derive the constraint localization cramer-rao lower bound(CRLB)and proposes two fusion localization algorithms including Gauss-Newton solution and algebraic solution.In the third chapter,the ambiguity resolution algorithm based on the fusion localization is investigated.The ambiguity problem of TDOA/FDOA localization caused by pulse signal is examined,and the prerequisite of no ambiguity TDOA and FDOA is derived.And then we propose the ambiguity resolution algorithm with the no ambiguity AOA information and the ambiguous phase difference of arrival(PDOA)information.In the fourth chapter,we research the problems of motion detection and localization and tracking of the moving emitter.First,the model of moving emitter localization is established and localization CRLB is derived.Then the algorithm of locating and tracking the moving emitter is proposed,which obtains the initial location estimate using the DOA measured by the interferometer and TDOA measurement,then combines the FDOA measurement,realizes the final localization and tracking via inverse extended kalman filter(IEKF).Moreover,goodness of fit Test and Rao Test are used to detect the movement of the emitter.In the fifth chapter,the thesis established the space electronic reconnaissance simulation system with satellite toolkit(STK).The components of the software are introduced and the develop idea and implement process are demonstrated.The functions of the software includes: simulating various localization algorithms based dual or tri-satellites and the proposed algorithms in the thesis,analyzing localization efficiency.