关键词: 导航卫星, 信息传输, 星间链路, 射频链路, OPNET平台

Abstract: 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.

Key words: Navigation satellite, Data transmission, Inter-satellite link, Radio frequency link, OPNET