基于综合信道模型的星地信道性能研究

全球导航卫星系统由位于不同轨道上的多颗卫星组成。卫星轨道和地面用户位置的差异造成了星地链路传播机制和统计特性的差异。信道的统计特性对于卫星系统的性能有着重要的影响。文章建立了星地信道综合模型,考虑了不同大气条件和传播机制的影响。基于此模型,给出了调制方式为二元相移键控时的误比特率与信噪比的关系。研究方法和结果可为全球导航卫星系统的仿真和设计提供借鉴。

Investigation on Performance of Satellite-ground Channel Based on a Compound Channel Model

Global navigation satellite system（GNSS） consists of satellites in a variety of orbits.The difference of the orbits and the location of the users produce the different propagation mechanisms and characteristics of satellite-ground channels.The statistical characteristics of the channels have great impact on the performance of the GNSS.In this paper,a compound satellite-to-ground channel model is proposed.Both the weather condition and the propagation mechanism are taken into consideration.Based on the channel model,the relationship between bit error rate and signal-to-noise ratio is given when binary phase shift keying is used.The method and results presented can provide a basis for the simulation and design of the GNSS.