Research On Passive Location Method In The Complex Environment Based On The Trajectory

With the development of stealth and jamming technology,the missile technology based on active detection system has been unable to meet the needs of modern warfare.The missile based on passive positioning system has emerged,and gradually become an important part of missile weapon system,which is of great practical significance for the improvement of missile survival and penetration ability.In this dissertation,based on the trajectory passive location problem,the parameters extraction,observability,positioning accuracy and tracking filter of different positioning systems under different trajectories were analyzed and studied from the single station passive location principle,and the comparison and simulation were conducted on the effectiveness of the algorithm.The main contents of this dissertation are as follows:1.The positioning system is the basis for the realization of single station passive location.In this dissertation,three passive positioning systems were first introduced.The first one is the passive location method based on the arrival angle-arrival time,the second one is the positioning method based on the phase difference rate,and the third one is the positioning method based on the Doppler frequency change rate.In addition,the method of parameters estimation of phase difference variation rate and Doppler frequency change rate in the complex environment was also studied,which provides the basis for the improvement of subsequent positioning accuracy.2.The positioning performance of three different single-station passive location methods under leval trajectory was studied,which mainly includes the observability and the influence of observation parameters on the positioning error,and the influence of the type of trajectory on the positioning error.Combined with the characteristics of the trajectory itself,the contrastive analysis was performed on the positioning error under linear trajectory and two typical nonlinear trajectories.The adaptability of different positioning methods to the trajectory was analyzed.Besides,the corresponding comparative simulation analysis was conducted.3.The positioning performance of three different single-station passive location methods under the descent trajectory was studied.In this dissertation,the trajectory model of the descending section is established in proportional navigation.Additionally,the influence of different descending trajectories on the positioning performance of three different positioning systems is analyzed by the simulation.4.In essence,the passive location method based on the trajectory is a complex nonlinear filtering problem.In this dissertation,the target location algorithm based on Kalman filter was studied.The extended Kalman filter(EKF),unscented Kalman filter(UKF)and cubage Kalman filter(CKF)were combined with the single station passive location method.The filter performance under three different positioning systems and different trajectories was analyzed.Additionally,the location filter performance of different algorithms is comparatively analyzed by the simulation.