Research On The Ambiguity Resolution Of Uniform Circular Array And Realization Of Passive Radar Direction Finding Simulation Platform

More perplexing the electromagnetic environment in modern battlefield put forward higher requirements to electronic countermeasure technology and equipment,the passive radar guidance direction finding system has many advantages of strong concealment,anti-jamming ability,far distance and non-contact,the high accuracy and high resolution performance of its space domain analysis improved the traditional interferometer direction finding method,which has become an important way of long-range precision strike over the horizon.This paper focuses on the research of the uniform circular array ambiguity resolution,the simulation platform of passive radar guidance and direction finding system,specific contents are as follows:First,we consider the problem of uniform circular array ambiguity resolution under different array elements.The array structure affects the performance of direction finding,the uniform circular array antenna array structure of passive radar seeker,has the advantages of easy design,easy analysis and comprehensive direction,but the symmetry of the antenna array also makes the possibility of increased ambiguity.It is determined that the research emphasis of this study is finding first-order ambiguity based on the direction of ambiguity classification.By deducing the influence produced ambiguity formula,the two main factors of direction finding ambiguity are obtained: incident direction of the signal source and the receiving array structure.The direction angle and elevation angle are the determining factors of the incident angle;receiving array structure because of its uniform circular array design,the main influencing factors are the array element number and radius,the radius of the uniform circular array we mainly focus on the relationship between the wavelength and incident signal source.Generally speaking,these two factors are the principle reasons for the existence of ambiguity.Because of practical engineering,we cannot control or predict the direction of the incoming signal source,so this paper focuses on the analysis of the effect of uniform circular array ambiguity on the analysis of the array structure.After the ambiguity resolution is deduced,the method of the uniform circular array along the altered direction of incidence is used as a method to periodically map the uniform linear array.Secondly,we build the simulation platform of passive radar guidance and direction finding system.The simulation platform of universal passive radar direction finding system is built based on actual direction finding system model.The space in any direction signal source is incident to the passive radar seeker antenna array direction finding system,the front end of the received signal after estimation of signal and information processing technology using spatial spectrum after the front end of the received signal,in order to get to the wave direction angle and elevation angle estimation,projection the pitch angle and course angle.In this paper,the passive radar direction finding system simulation platform is described from three aspects: the overall design,the modular design and the main functions.From the system architecture,the overall framework of passive radar direction finding system is built;direction finding antenna module,signal source module,signal and information processing module,simulation module and simulation environment and results from the passive radar display module of the five modules to specific design and simulation platform of universal passive radar direction finding system;from the interactive function,the interface between different pre judgment of main function and alarm function and simulation record function simulation platform for passive radar direction finding system,show its versatility,convenience and friendly.