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• W3048471849 abstract "The realization of International Height Reference System (IHRS) is one of the major tasks of the International Association of Geodesy (IAG). A main component of the IHRS realization is the global vertical datum unification, which requires the connection of the existing local vertical height reference systems (VHS). However, it is difficult to estimate the offsets between two local height systems by conventional approaches when they are far apart. In this paper, we formulate a framework for connecting two local VHSs using ultra-precise frequency signal transmission links between satellites and ground stations, which is referred to as satellite frequency signal transmission (SFST) approach. The SFST approach can directly determine the geopotential difference between two ground datum stations without location restrictions, and consequently determine the height difference of the two VHSs. Simulation results show that the China's VHS and the US's VHS can be unified at the accuracy of several centimeters, provided that the stability of atomic clocks used on board the satellite and on ground datum stations reach the highest level of current technology, about $4.8times 10^{-17}/sqrt{tau}$ for an averaging time {tau} (in seconds). The SFST approach is promising to unify the global vertical height datum in centimeter level in future, and it also provide a new way for the IHRS realization." @default.
• W3048471849 created "2020-08-18" @default.
• W3048471849 creator A5011637686 @default.
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• W3048471849 date "2020-08-13" @default.
• W3048471849 modified "2023-09-28" @default.
• W3048471849 title "Unification of global height system at centimeter level using precise frequency signal links" @default.
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• W3048471849 hasPublicationYear "2020" @default.
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