基于射频的导航卫星星间链路信息传输与仿真研究

星间链路是导航卫星实现精密定轨和自主导航的关键技术之一。导航卫星通过星间链路完成伪距测量和数据交换,维持系统稳定运行的时空基准,保证系统持续提供精准导航服务。根据全球导航卫星系统的建设情况和发展趋势,首先介绍星间观测和信息传输频段,并从天线特征、多址控制方式和网络拓扑结构等角度分析了射频链路的工作体制。最后,针对实际导航卫星星座,应用OPNET平台建立导航信息传输仿真模型,通过分析信息传输效率,验证了基于射频链路导航信息传输的可行性和有效性,对全球导航卫星系统的星间链路研究具有一定的参考价值。

Research on Inter-satellite Navigation Data Transmission and Simulation based on Radio Frequency Link Network

Inter-satellite link is one of the key technologies for precise orbit determination and autonomous navigation of navigation satellites.The navigation satellite completes pseudo-range measurement and data exchange through inter-satellite radio frequency link or optical link,which maintains the space-time benchmark for the system operation,and ensures that the system provides continuous precise navigation services.According to the construction situation and development trend of GNSS,this paper firstly introduces the inter-satellite observation and information transmission frequency band.Then,we analyse the working system of radio link from the antenna characteristics,multiple access control and link allocation.Finally,according to the actual navigation constellation,the simulation model of navigation information transmission is established based on the OPNET.By analyzing the efficiency of information transmission,it verifies the feasibility and effectiveness of navigation information transmission based on radio frequency link,which has a certain reference value for the study of the inter-satellite link of GNSS.