Research On Key Technologies Of Radio Monitoring System

Radio technology is one of the most rapidly developing technologies in the twenty-first Century,and radio monitoring plays a vital role in radio technology.The main contents of the radio monitoring is the identification and parametric analysis of measurement of radio signals,the main purpose is to target direction finding and positioning,so as to obtain the effective information signal,corresponding to the management and maintenance of the radio spectrum resources,maintain the sustained and healthy development of citizens and property safety and social economic information.At present,the radio signal parameter measurement,synchronization technology,radio direction finding and positioning technology are the research focus.In this thesis,the software radio technology is used to study the above problems.Firstly,this thesis introduces the composition of radio monitoring system,the basic functions,the basic framework of the software wireless system,the main contents of the radio monitoring and the research status of the key technologies in the monitoring system at home and abroad.Then,based on the software radio,the parameter measurement model under different radio signal modulation is established.In the simulation of radio signal,the amplitude modulation,phase modulation and frequency modulation parameter measurement model is established,the amplitude,phase and frequency demodulation are completed,and the correctness of the model is verified by MATLAB simulation.At the same time,carrier synchronization technology which is widely concerned in digital signal is studied.Then,the radio direction finding technology is discussed and analyzed,and the range of radio direction finding is discussed.Study on the estimation method of radio direction finding algorithm based on the spatial spectrum of a linear array,analyzes the advantages and disadvantages of spectrum estimation phase and amplitude direction finding direction and space,the measurement data processing in the direction finding technology of the error analysis and error correction.Finally,the thesis focuses on the wireless location algorithm,and establishes the model of the arrival time difference algorithm(TDOA)and the MATLAB simulation.At the same time,analysis of the existing TDOA system delay,based on several methods to estimate time delay,a delay of the improved model is verified by simulation,this thesis proposes to estimate the time delay proved the superiority of the algorithm.