LI Bao-dong1, LIU Li1,2, JU Xiang-ming3, SHI Xin1, ZHU Ling-feng1

(1. Mailbox 5136, Beijing 100094, China;

2. Key Laboratory of Dynamic Geodesy, Institute of Geodesy & Geophysics, CAS, Wuhan 430077, China;

3. Navy Bengbu Petty School, Bengbu 233012, China) 

Abstract: The theory of compass satellite two-way timing is introduced in this paper. A specific calculating model which takes the Sagnac correction into consideration is given, based on a discussion on the former calculation model of two-way timing. Then the Sagnac effects in several representative areas are analyzed. The results show that the Sagnac correction reaches dozens of nano-seconds if the user’s position is far from the centre station. At last, the precision of compass satellite two-way timing is analyzed and the precision is verified with some tests conducted in several districts.

Key words: satellite positioning system; time; two-way timing