Design And Application Of TDOA Location Technology For Moving Platform

Passive time difference positioning is an important electronic reconnaissance technology in the field of electronic warfare.It forms a hyperboloid by collecting the time difference(DTOA)of the emitter signal to different electronic reconnaissance stations,and then locates the emitter.Since the time difference positioning system is a passive means of reconnaissance,it does not emit any signals and so it has strong survivability.The time difference positioning,which is widely applied,is generally possessing high accuracy,suitable for installation on various platforms.This paper firstly studies the basic principles of time difference positioning,presents the Chan algorithm for solving the positioning equations,analyzes the influence of time difference measurement accuracy,baseline length,and station deployment method on the system positioning accuracy,and proposes a method to solve the positioning ambiguity.Computer simulation is conducted to the positioning performance of the system.Secondly,this paper studies the location information acquisition technology of each platform of the system and the time synchronization technology between each platform.A method to achieve rapid acquisition and stable tracking of RNSS signals in large dynamic scenarios is proposed,and multi-point data fitting and interpolation methods are used to obtain high-precision navigation information;a double-round double-way time comparison timing protocol is proposed to eliminate the path delay caused by the relative radial movement between the main and sub stations,which can realize high-precision timing in a highly dynamic environment.Then,this paper studies the vital DTOA acquisition technology in the time difference positioning system,analyzes the principle of parameter measurement based on Haar wavelet transform method and correlation method,and gives the computer simulation results under different signal styles.The idea of combination of the two measurement methods is proposed;signal sorting process in the time difference positioning system is studied in the subsequent chapters,and reliable sorting in complex environments is achieved through time window filtering,parameter correlation and histogram analysis.Finally,this article introduces and summarizes the realization of each functional module in the development of the time difference positioning system,and discusses the problems that need further research.