Satellite-ground laser time transfer technology and its development in China

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Important Dates

Conference:

Apr. 22-24, 2019

Full Paper Due: Mar. 18, 2019

Abstract Due: Mar. 18, 2019

Audience Registration Due:
Apr. 22, 2019

Presentations of The Spring World Congress on Engineering and Technology (SCET 2017)

● Satellite-ground laser time transfer technology and its development in China
Author(s)
Meng Wendong
Affiliation(s)
The Chinese Academy of Sciences
KEYWORDS
Satellite-ground laser time transfer technology, development
ABSTRACT
With quick development of frequency standard, high stability and accuracy of time transfer is demanded. Satellite-based time synchronization is an important means in remote time transfer. Among satellite-ground time transfer techniques, laser time transfer has the best single measurement precision and accuracy. The first mission of Chinese laser time transfer (LTT) between ground and Chinese navigation satellites was successfully implemented by Shanghai Astronomical Observatory, China Academy of Sciences (CAS). The time difference was obtained with the single shot precision of about 300ps, and the time stability of 20ps@500s. A new laser time transfer plan is in process involved in a mission of China Space Station with its orbit altitude of around 400km, with time comparison single shot precision of 60ps, stability of less than 1ps@300s, and 1ps@1day. This paper introduces the LTT technology, its development in China, and some very recent experiment results.