Modeling And Simulation Of Passive Bearing-Only Location System

In today's increasingly complex environment,the traditional active positioning device is faced with a variety of interference,deception and anti-detection of the threat of weapons,and passive positioning system can not be outside the energy of their own conditions to detect the target,and has The role of distance,concealment and low cost advantages,improve the positioning system application capacity and viability,which has been the world's attention.Directional parameters in the complex electromagnetic environment has almost become the only reliable parameter,from which to determine the location of the most reliable radiation source.So the direction of positioning method has been as passive positioning method of the main content of continuous development.The phase interferometer is measured by using a number of antenna elements arranged in a certain way to receive the incoming wave signal,and the target direction is obtained by the phase difference of the signal.This method has a low requirement for antenna array and computational resources,and can guarantee a certain direction accuracy within a certain angle range.In this context,we mainly study the passive positioning system based on interferometer direction finding.The paper mainly carried out the following work:1 The passive positioning system is analyzed and the model is established.Firstly,the main objectives of the passive positioning system are analyzed.Secondly,the function of the passive positioning system is described,and the system model of the passive positioning system is constructed.Then,from the parameter extraction(digital channelization,amplitude phase Demodulation,time domain information and phase difference),sorting recognition(pulse sorting,pulse analysis),direction finding and positioning of the system in the complex electromagnetic environment how to locate the radiation source.2 Modeling and Simulation of Interferometer Direction Finding.This paper analyzes the commonly used direction finding method,gives the block diagram of interferometer direction finding,and studies the commonly used method(length and length method and virtual baseline method).Aiming at the commonly used one-dimensional linear array interferometer and two-dimensional orthogonal interferometer,the direction finding model is constructed,and the factors influencing the direction finding performance are analyzed,and the simulation experiment is used to verify.Then,a two-dimensional circular array Phase interferometer,and the phase difference is solved by using the virtual baseline.The accuracy of the direction finding,the influencing factors and the application conditions are analyzed by simulation experiment.3 Modeling and Simulation of Single Station Passive Direction Finding.Firstly,the mathematical model of target location is given,and then the spatial geometrical principle of target location is analyzed.The coordinate system and the mutual conversion model between them are studied.A weighted least squares single station passive The positioning accuracy of the method is proved by the simulation experiment.The accuracy of the method is almost close to the lower bound of the Kramerilian under the condition that the modern engineering measurement technology can guarantee the condition.4 Modeling and Simulation of Two-station and Multi-station Direction Finding.Firstly,the model of two-station direction finding is constructed,the principle of positioning is given,the factors influencing its positioning performance are analyzed,and the simulation experiment is carried out.Then,the model of multi-station direction finding is constructed.And the influence of the angle measurement error on the positioning result is analyzed.Finally,the problem of generating a large number of false positioning points when the multi-target is applied to the multi-target is proposed,and the false positioning Point of the method,and their performance was analyzed.