Abstract
Propagation path delays are a major error for the remote precise time transfer of common view; these path delays contain the ionosphere and troposphere impact, while the contributions of the ionosphere and the troposphere from common-view satellites to receivers on the ground tend to become uncorrelated when the distance between these receivers increases. In order to select the appropriate ionospheric correction method for common view under different distances between receivers, a detailed test using multi-source data under different ionosphere disturbances are carried out in this paper. Here, we choose three different ionosphere disturbance methods and analyze the advantages and disadvantages of these methods for common-view time transfer and time comparison. At last, we put forward a suitable ionospheric correction method for different distances common view. The RMS shows that the method proposed for 3000 km remote common view can achieve 2.5 ns.
Highlights
Time and frequency synchronization is an important issue for the cooperative work of manned space flights and spatially distributed carriers, military strike technology, and other areas related to the Internet of Things
The two-way optical fiber time transfer technology uses an optical fiber link to transfer the time signal, which has a minimal effect on the environment compared with the Two-Way Satellite Time and Frequency Transfer (TWSTFT) and Common View (CV) technology
The common view is the simplest method for time transfer and time comparison; with the development of the Global Navigation Satellite System (GNSS) navigation system, more satellites can be utilized for common-view time transfer
Summary
Time and frequency synchronization is an important issue for the cooperative work of manned space flights and spatially distributed carriers, military strike technology, and other areas related to the Internet of Things. The TWSTFT technology needs to rent a precise ephemeris communication satellite, build special transmitting, and receiving signal equipment; these costs are high and cannot be continuous [1,5], currently, only few laboratories have TWSTFT time transfer systems. The two-way optical fiber time transfer technology uses an optical fiber link to transfer the time signal, which has a minimal effect on the environment compared with the TWSTFT and CV technology. It requires laying optical fiber, and the cost of fiber regarding time and frequency distribution is too high. CV has the advantages of continuity, low cost, and ease of realization; nowadays, it is the primary method in the computation of International
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