Study on the Interoperability of System Time

被引：0

作者：

Li, Xiaohui ^{[1
,2
,3
]}

Xu, Longxia ^{[1
,2
,3
]}

Zhang, Huijun ^{[1
,2
,3
]}

Xue, Yanrong ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Natl Time Serv Ctr, 3 Shuyuan Rd, Xian 710600, Shaanxi, Peoples R China

[2] Chinese Acad Sci, Key Lab Precise Nav Positioning & Timing Technol, Xian 710600, Shaanxi, Peoples R China

[3] Chinese Acad Sci, Key Lab Time & Frequency Primary Stand, Xian 710600, Shaanxi, Peoples R China

来源：

CSNC 2011: 2ND CHINA SATELLITE NAVIGATION CONFERENCE, VOLS 1-3 | 2011年

关键词：

multiple-mode Navigation; system time; algorithm; interoperability;

D O I：

暂无

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

The system time of navigation system must be interoperability in multi-mode navigation. In this paper, the current two system time offset processing methods are studied based on the analysis that system time offsets form performance at client terminal. In the open environment, the processing approach of user-level is better than the system-level. However, in the shelter environment, the user-level processing performance degradation is obvious. Poor Geometric Dilution Precision (GDOP) is the key reasons. So we propose the system time offset assisted navigation algorithm to solve the limitation of user-level processing method. When satellite geometry is poor, the prediction values of system time offset can be as known quantity, and then we can improve positioning accuracy by reducing the number of unknowns. The performance of the new algorithm is investigated when applied to simulated measurements. It shows this method is useful obviously for improving availability and positioning accuracy.

引用

页码：319 / 325

页数：7