地面增强系统导航信号源的设计与实现

Design and implementation of the navigation signal source of ground enhanced system

导航地面增强系统通过提供差分修正信号,可达到提高卫星导航精度的目的,提高了导航完备性、可用性、可靠性。通过对地面增强系统信号源详细的分析与设计,使用LabVIEW FPGA编程,利用NI公司的PXIe-5645R矢量信号收发仪等设备,产生导航地面增强信号。利用设备内置的FPGA进行伪码扩频调制和BPSK调制等基带信号处理,最终正交上变频输出导航增强信号。着重讨论了单信号源产生过程中各模块的设计以及多信号源同步授时模块的设计。最后通过对生成信号分析,验证了其正确性。

The ground navigation system by providing enhanced differential correction signal can improve the precision of the satellite navigation, improve navigation integrity, availability and reliability. Through the analysis and design of ground system with the enhanced signal source, the use of LabVIEW FPGA programming, using NI＇s PXIe-5645R vector signal transceiver equipment, generates navigation enhanced signal ground. Using FPGA devices to have the PN sequence spread spectrum modulation and BPSK modulation and other baseband signal processings, the final orthogonal frequency outputs navigation enhanced signals. This paper focuses on the single signal source design of each module in the process and the signal source synchronous timing module. Finally, through the analysis of the generated signal, the correctness of the analysis is verified.