导航卫星有效载荷新型扩频码研究及实现*

Research and implementation of a new kind of spreading code for navigation satellite payload

摘要:

针对导航卫星中 Gold 扩频码存在的不足，卫星导航系统的多个频点在下一代系统建设中选用 Weil 码作为扩频码。首先对 Gold 码和 Weil 码的特性进行仿真分析，仿真结果表明，Weil 码的自相关特性和互相关特性有明显的优势。针对导航卫星有效载荷需要提供长期稳定可靠的导航服务且资源有限，对 Weil 码的实现方式也有很高的要求， 设计一种基于 FPGA 平台的 Weil 码实现方案，解决了导航卫星有效载荷中 Weil 扩频码生成的资源和可靠性问题，已实际在轨连续运行超过一年没有出现故障。

Abstract:

Aiming at the defects of Gold spreading code on navigation satellite, several frequencies of satellite navigation system have chose Weil code as spreading code on next system built. This paper analyzes the character of Gold code and Weil code firstly, the simulation results demonstrate that the self-correlation and cross-correlation performance of Weil Code are better than Gold Code. Since navigation satellite payload needs to provide long-term stable and reliable navigation services with limited resources, there are high requirements for the implementation of Weil code, this paper designs a Weil code implement method based on the FPGA platform, the solution solves the problem of resource and reliability of the Weil code generation in the navigation satellite payload, has been actually running in orbit for more than one year without failure.