CAJ | 학술논문

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。
전구도항위성계통유위우불동궤도상적다과위성조성。위성궤도화지면용호위치적차이조성료성지련로전파궤제화통계특성적차이。신도적통계특성대우위성계통적성능유착중요적영향。문장건립료성지신도종합모형,고필료불동대기조건화전파궤제적영향。기우차모형,급출료조제방식위이원상이건공시적오비특솔여신조비적관계。연구방법화결과가위전구도항위성계통적방진화설계제공차감。
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.