| In recent years,there are more and more researches on Multiple-Input Multiple-Output(MIMO)radar.Unlike the conventional radar,the characteristics,combined spatial diversity and signal diversity,make the MIMO radar's ability of target detection and parameter estimation more excellent.In addition,the low interception performance of MIMO radar makes its anti-jamming performance better.However,there are few examples of applying MIMO radar technology to actual projects.Aiming at the practical application of MIMO radar technology,unlike the conventional kroneck model,this thesis focuses on the analysis of the orthogonality of multi-emission waveforms and the separation methods which may influence the direction finding accuracy of MIMO radar.What's more,a high resolution direction finding algorithm matching MIMO radar system and a structure of high resolution direction-finding which based on MIMO radar,are designed in this thesis.This structure can be applied to practical projects.The feasibility and effectiveness of this system is proved from two aspects: theoretical analysis and simulation experiments.First of all,starting from the principles of array signal processing involved in MIMO radar,the signal modeling method of real MIMO radar,the steps of separating the multiple transmit and receive signals,the application of high resolution direction-finding algorithm in MIMO radar are given in this thesis.Among them,the method of improving the separation degree of multi-transmit signals is studied emphatically in this thesis.In addition,some modeling methods of interferences are studied and analyzed that may meet in MIMO radar.Then,this thesis analyses the structure of the direction-finding system which based on MIMO radar.In the form of mathematical deduction and simulation,the role of each system module is explained in detail from the selection of transmitting orthogonal signal to the final direction-finding by using two groups of different orthogonal waveforms.This chapter compares the influence of different orthogonal waveforms on each module,which lays the math foundation for the practical application of MIMO radar technology.Finally,the structure of MIMO radar direction-finding system is simulated,and its directionfinding performance is analyzed.The robustness and direction-finding performance under complex interferences are studied.And the performances of high resolution direction finding obtained from two parts of orthogonal waveform are compared.As a simulation experiment supports for MIMO radar technology applied to actual projects,it proves the feasibility and effectiveness of the practical application of MIMO radar. |
PDF Full Text Request