Relativistic Time Transfer for Inter-satellite Links

Frontiers in Astronomy and Space Sciences

Xie, Yi¹ 

[1]Department of Astronomy, School of Astronomy and Space Sciences, Nanjing University, Nanjing, China

关键词: general relativity;    Time transfer;    Inter-satellite link;    Time comparison;    global navigation satellite systems;   

DOI  :  10.3389/fspas.2016.00015

学科分类：空间科学

来源: Frontiers

【 摘 要 】

Inter-Satellite links (ISLs) will be an important technique for a global navigation satellite system (GNSS) in the future. Based on the principles of general relativity, the time transfer in an ISL is modeled and the algorithm for onboard computation is described. It is found, in general, satellites with circular orbits and identical semi-major axes can benefit inter-satellite time transfer by canceling out terms associated with the transformations between the proper times and the Geocentric Coordinate Time. For a GPS-like GNSS, the Shapiro delay is as large as 0.1 nano-second when the ISL passes at the limb of the Earth. However, in more realistic cases, this value will decrease to about 50 pico-second.

【 授权许可】

CC BY