Research On Multi-Station Passive Location For Fixed Radiation Source

Passive location is an independent localization technology that can be used as an important means of obtaining the position of radiation source,and can also be used as a supplement to active detection system.Passive location is favored by countries all over the world because of its advantages different from radar.Compared with single-station passive location,multi-station passive location has the characteristics of high fault-tolerant rate and more available data,but it has higher requirements for the cooperative working ability of each location station.At present,the research on multi-station passive location mainly focuses on cooperative signal processing,positioning algorithm,positioning accuracy analysis,station layout optimization and so on.And these are all about how to improve the performance of passive location system.Firstly,this thesis introduces several common multi-station passive location methods.And the basic positioning principles of direction finding cross location method,passive TDOA location method,passive FDOA location method and multi-station joint location method are studied respectively.Then,based on multi-station passive location method,the positioning algorithm and positioning accuracy of moving multi-station for fixed radiation source are studied.The positioning equations and accuracy formulas of FDOA location and space four-station TDOA location are derived respectively.The corresponding results are compared by experimental simulation,and the influence of measurement parameters on positioning accuracy is analyzed.In the research of joint TDOA/FDOA location,besides the analysis of positioning accuracy,aiming at the complex problem of solving non-linear equation in positioning equation,after studying differential evolution algorithm and Newton's method,a model of target location solution based on differential evolution algorithm and Newton's method is proposed,which realizes the accurate estimation of target location.Experiments show that the method has good performance and does not need to provide the initial point of iteration.Finally,aiming at the station layout optimization problem of passive location in application,taking the space four-station TDOA location system as the application background,the positioning accuracy and applicable scenarios of several common configuration of passive location are studied and simulated.Then,based on the optimization theory,the station layout optimization of passive location based on cuckoo search algorithm is proposed.By comparing the simulation results with the differential evolution algorithm,it is proved that the algorithm is feasible and has better convergence speed.