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由地球同步卫星、地面中心站和用户机组成的集中式卫星定位系统中,用户到中心站的入站链路采用码分随机多址接入信道;出站链路采用扩频/TDM广播信道。本文建立了入站信道的用户容量模型,获得用户容量、系统参数、设备要求之间的关系;为增大出站广播信道的通信容量、采用同步码分多路复用技术,推导出计算数据误码率的公式。由计算机模拟,给出一系列曲线和图表以作为系统设计依据。
In a centralized satellite positioning system composed of geostationary satellites, terrestrial center stations, and user machines, a code division multiple access radio access channel is used for the inbound link from the user to the central station; the outbound link is spread spectrum / TDM broadcast channel . In this paper, the user capacity model of inbound channel is established to obtain the relationship between user capacity, system parameters and equipment requirements. In order to increase the communication capacity of outbound broadcast channel, synchronous code division multiplexing The error rate formula. By computer simulation, given a series of curves and charts as a basis for system design.