摘要
进行信号体制设计与仿真验证是建立近空间区域导航增强系统必不可少的工作。由于近空间平台与导航卫星在飞行高度上的差别导致近空间伪卫星信号有着非常严重的远近效应,必须采取措施予以解决。通过采用成熟的脉冲发射方法进行近空间伪卫星信号的设计,以避免发生远近效应。分析脉冲信号设计的各项要素,简要介绍目前存在的各种伪卫星脉冲信号设计方案,对伪卫星信号的脉冲占空比限制进行理论研究,提出近空间区域导航增强系统中伪卫星信号的设计方法,对伪卫星信号脉冲重叠特性进行分析和改进,同时对近空间伪卫星信号的发射功率进行概要分析。最后,采用中频信号仿真系统对设计的近空间区域导航增强系统信号进行仿真验证,仿真结果证明设计的信号是可行的。
The signal design and validation is a necessary task for the construction of near space local area augmentation system. For the big difference between the attitude of near space platform and navigation satellites,there is serious near/far problem for the near space pseudolite signal.This must be resolved with some measures.The pulse transmission method is adopted in this paper for the design of near space local area augmentation system signal.The basic elements of the pulse transmission method are analyzed and the two current existed pulse transmission patterns are introduced.The paper has made a theoretical analysis on the pulse duty cycle of the pseudolite signal and presented a method for the generation of the near space pseudolite pulse.The overlapping characteristic of pseudolite signal pulse is studied and upgraded and the transmission power of the near space pseudolite is also computed. At last,the designed near space augmentation signal is validated with an IF signal simulation system.The results show that the designed signal is feasible.
出处
《遥测遥控》
2009年第4期32-39,共8页
Journal of Telemetry,Tracking and Command
关键词
近空间
平流层
伪卫星
区域增强系统
Near space
Stratospheric
Pseudolite
Local area augmentation system
