摘要
伪卫星技术在改善和增强卫星导航系统定位性能等方面起到极其重要的作用。在应用中,常常会遇到时间同步、远近效应和几何精度衰减因子等问题。介绍了伪卫星应用中远近效应问题和常用的解决方案,重点分析了采用时分多址技术来进行伪卫星信号设计的问题。通过研究证明,采用时分多路复用更适合远近效应问题的解决。对伽利略伪卫星的脉冲调制进行了研究,得出了适合伽利略信号的脉冲调制占空比参数。
Pseudolite technology plays an important role in improving and enhancing the positioning performance of Global Navigational Satellite System.In applications,there are many problems,such as timing synchronization,near-far effect,and geometric dilution of precision（GDOP）.This paper introduces the near-far effect of the pseudolite and some general solutions,focusing on the redesigning of pseudolite signals with the TDMA technology.Experimental results show the TDMA technology is suitable for the solution of near-far effect.In addition,through research on TDMA scheme of GALILEO pseudolite,a parameter of duty cycle suitable for GALILEO signals is obtained.
出处
《无线电工程》
2010年第6期31-33,61,共4页
Radio Engineering
基金
863课题项目支持(2008AA12Z302)
