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中南大学学报(自然科学版)

Journal of Central South University

第45卷    第2期    总第234期    2014年2月

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文章编号:1672-7207(2014)02-0468-06
功率增强下的卫星导航星间信号辅助能力分析
肖志斌,张鑫,唐小妹,王飞雪

(国防科技大学 电子科学与工程学院,湖南 长沙,410073)

摘 要: 设计基于卫星间信号辅助的接收机实现结构,在此基础上通过理论推导与数值计算分析加入卫星间信号辅助量后的载波相位跟踪门限。研究结果表明:加入卫星间信号辅助量后,可基本消除载波跟踪环路中由接收机运动引入的动态,从而极大地提高环路的动态适应性。在冲击动态为1~50g/s,辅助卫星的GDOP值高达50的恶劣情况下,增加卫星间辅助量后,被辅助卫星的载波相位跟踪门限为23~25 dB,相对于无辅助情况下降低7~13 dB,显然卫星间信号辅助能力较为可观,且对辅助卫星的GDOP值要求不高。因此,选择功率增强卫星时只需要保证相关区域在全时段可以观测到4颗以上功率增强卫星即可,此时可以近似达到与全星座功率增强一样的性能。

 

关键字: 功率增强;载波跟踪门限;卫星间信号辅助

Analysis of inter-satellite signal assistance capacity under satellite power enhancement
XIAO Zhibin, ZHANG Xin, TANG Xiaomei, WANG Feixue

School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China

Abstract:The architecture of receiver was designed based on inter-satellite signal assistance and the carrier phase tracking threshold that incorporates the inter-satellite signal assistance was analyzed through theoretical deduction and numerical calculation on this basis. The results indicate that the inter-satellite signal assistance can essentially eliminate the dynamic introduced by the motion of the receiver in the carrier tracking loop, thereby improving the dynamic adaptability of the loop greatly. When impact dynamic is 1-50g/s and the GDOP value of the assisted satellite is 50, after the inter-satellite assistance is added, the carrier phase tracking threshold of the assisted satellite will be 23-25 dB, lower than that without assistance by 7-13 dB. Inter-satellite signal assistance capacity is obviously considerable and does not have a high requirement for the GDOP value of the assisted satellite. Accordingly, when power enhancement satellites are selected, it is only necessary to ensure that four or more power enhancement satellites are observed all the time in the relevant area, which can almost reach the same performance of the power enhancement of the whole satellite constellation.

 

Key words: power enhancement; carrier tracking threshold; inter-satellite signal assistance

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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