Study Of Satellite Mobile Communication Channel Corazza Model Under Certain Environment

Wide service range,short communication time delay,small link loss,flexible network construction,because of these characteristics, Satellite mobile communication system has become one of the hot communication research fields and a useful tool for modern communication.It is needed to study the transmission characteristics of its signal channel and construct signal channel model in order to ensure reliable satellite mobile communications.First,this paper introduces the factors which affect communication electric wave during transmission in the satellite mobile communication channel,including multi-path fading, shadow effect and Doppler frequency offset.It's common to use probability distributions functions to describe the transmission feature of satellite mobile communication channel ,Rayleigh and Rician distributions are used in describing multi-path fading, Lognormal distributions is use in describing shadow effect. In the basis of study these probability distributions functions, we get theoretical formulas of C.Loo model, Corazza model and Lutz model.Then, establishing emulation models of three probability distributions functions, at the same time, get principle schemes of C.Loo model, Corazza model and Lutz model which are under MATLAB-SIMULINK circumstances.At last, this paper measure and test the Corazza model in baseband which is under country trees shadow environment, inspect and verify the reliability of Corazza model through the comparision and analysis of bit error rate, and gives a system simulation diagram using channel encoding to improve communication performance.The establishing of satellite mobile communication channel model, afford simple emulation circumstances for the research of satellite communication system, it simplifies the difficulty of system simulation and increase the efficiency. Through software simulation, we have deep impression of the channel under country environment; the solution set a good base for study the features of satellite mobile communication channel model.