Accuracy Analysis Of Passive Location Algorithm For Communication Radiation Source

With the development of wireless communication technology,the passive location system for communication radiation sources has been used more and more widely in the increasingly fierce radio war.Passive detection of communication radiation sources has attracted much attention and become the main research direction.Aiming at the passive location technology of communication radiation source,by receiving the signal of target radiation source passively,the relevant parameters of location are obtained,and the position information of the target of communication radiation source is obtained.Therefore,passive positioning technology has been paid more attention because of its good concealment,strong anti-reconnaissance and anti-jamming ability.Focusing on the passive location algorithm of communication radiation source,this paper introduces the direction finding cross location algorithm(AOA),time difference location algorithm(TDOA)and time difference direction finding joint location algorithm respectively for communication radiation source,and uses Kalman filter algorithm to filter out errors and improve the positioning accuracy.The specific work is as follows:1.The passive localization is summarized.Compare the advantages and disadvantages of passive positioning system and active positioning system.The passive localization algorithm involved in this paper is introduced,and its advantages and disadvantages are analyzed.The sensitivity and peak power of the receiver which affect the action area and action distance of the passive positioning system are analyzed.2.The related content of direction finding and cross location algorithm for communication radiation source is analyzed.The principle of amplitude direction finding method is analyzed.The three-station direction finding and cross-location algorithm in two-dimensional space and the two-station direction finding and cross-location algorithm in three-dimensional space are introduced.Due to the existence of error,there will be a fuzzy region in direction finding cross location.This paper explains the main influencing factors of the fuzzy region by calculating the area of the fuzzy region.At the same time,the GDOP of direction finding cross location accuracy is analyzed.3.The time difference locating algorithm for communication radiation source is analyzed.This paper introduces the method of time synchronization between base stations and GPS timing method for time synchronization in detail.The method of measuring the arrival time is explained,and the principle of difference method and cross correlation method is described.The system model of passive time difference localization is introduced,and the method of time difference localization using Newton iteration method is deduced.The GDOP of the time difference positioning accuracy is derived,and the influencing factors of the positioning accuracy are analyzed.4.This paper analyzes the joint location algorithm using three stations time difference and direction finding for communication radiation source in three dimensional space.Aiming at the problem of positioning algorithm when there is systematic error in the positioning system,the time difference is obtained by using three stations,and the passive positioning model is established with the aid of pitch Angle.The weighted least square algorithm is used to calculate the passive location,and the rough estimate of the target is obtained.Then the Kalman filter algorithm is used to estimate the error of the pitch Angle,filter out the error of the height direction caused by the error of the pitch Angle,and get the new estimate of the target.At the same time,the GDOP of positioning accuracy is derived.