Research On Location And Tracking Technologies In External Illuminator Passive Radar

External radiation radar positioning system detect target by receiving different systems of civil electromagnetic.The system has a strong "hidden" and "preemptive" ability as it no need to radiate electromagnetic signals in the actual battlefield.With the high resistance combat capability and anti-stealth ability,nowadays,external radiation radar positioning tracking technology is gradually been concerned about,and playing an important role in the modern positioning and tracking technology.Some problems such as positioning accuracy,station optimization,TDOA positioning algorithm,multi-target location data association and maneuvering target tracking are discussed in the thesis.The specific work is as follows:The thesis introduces the basic working principle and structure flow of the passive radar system of the external radiation source.The thesis give a briefly introduces to the common positioning method in the data processing module of the external radiation source radar system,analyzes the advantages and disadvantages of each positioning algorithm,and gives the applicable range of different algorithms in the end.The positioning accuracy of external radiation source radar is studied.Firstly,the GDOP calculation formula of single station location is deduced,and the influence of baseline distance and site error,angle and time difference measurement error on GDOP distribution is analyzed.For the multi-station situation,multi-station cross location and time difference location model are discussed,and some optimization suggestions are given by analyzing the characteristics of GDOP distribution.Finally,the information redundancy is studied when multiple receivers can measure the time difference information and angle at the same time.According to the discussion of the positioning accuracy of different models,a practical and effective method for optimizing location is proposed,and then the GDOP accuracy diagram is given.The TDOA localization algorithm of external radiation source is studied.The thesis analyze the fuzzy and no solution in the radiation source target location model,and give a step selection and constraint condition of the steepest descent method in TDOA location.A new method based on modified Newton method is proposed.The Hesse matrix is modified by the analysis of the eigenvalue range of the Hesse matrix of the localization equation to ensure the correct search direction for each iteration,which greatly improves the convergence rate.The simulation results verify the correctness and validity of the method.The problem of multi-objective association matching is studied.A multi-objective TDOA location method based on height layer partitioning is proposed for multi-target environment.The thesis starts from some characteristics of the target's location,and some priori knowledge is used to match the time difference data.Finally,it estimate the spatial geometric coordinates of the target based on the least squares principle and the Newton iteration method.The problem of tracking and filtering of external radiation source is studied.This paper mainly discusses two kinds of tracking algorithms,such as extended Kalman filter and unscented Kalman filter.Then,based on the idea of IMM algorithm,the algorithm IMM-UKF is proposed.Then the error of maneuvering target tracking is compared with cross location and time difference location model.Finally,a data processing system of passive radar positioning and tracking is introduced,which based on the multi-target TDOA location.