基于SIMULINK的卫星通信系统仿真研究

简要分析卫星通信系统组成,估算卫星通信系统中存在的各种损耗与噪声,提出以链路信噪比、通信误码率作为衡量卫星通信系统性能的主要指标,并建模研究与分析信噪比与误码率的内在联系。运用SIMULINK仿真软件,以同步卫星为仿真对象,在卫星通信原理基础上对卫星通信系统适当简化,构建卫星通信基带等效模型,仿真得到出发射前和解调后信号星座图、功率谱图以及通信误码率曲线,对仿真结果的分析证明该仿真系统的合理性与可靠性,为运用SIMULINK软件仿真研究卫星通信系统奠定基础。

Research on Simulation of Satellite Communication System Based on SIMULINK

Composition of satellite communication system is analysed in brief.Losses and noises in communication system are estimated.The signal-to-nosie ratio and bit-error-rate are provided as index of satellite communication system’s performance.Relationship between the signal-to-nosie ratio and bit-error-rate is researched through modeling.On the basis of satellite communication’s theory,the communication system is simplified properly,the communication on baseband is modeled.And communication system of geostationary satellites is simulated with SIMULINK..Constellation diagrams, power spectrogram and bit-error-rate are acquired.The results show the rationality and reliability of system.It lays the foundation of simulating satellite communication system with SIMULINK.