Mr. WenBin Shen Profile

WenBin Shen

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Proceedings Article | 29 December 2008 Paper

The concept of direct orthometric height determination based on frequency shift equation

WenBin Shen, Jinsheng Ning, Jiancheng Li, Jingnan Liu, Dingbo Chao

Proceedings Volume 7285, 728512 (2008) https://doi.org/10.1117/12.816357

KEYWORDS: Clocks, Receivers, Californium, Geodesy, Global Positioning System, Electromagnetic radiation, Atomic clocks, Satellites, General relativity, Roads

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The orthometric height system plays a key role in geodesy, and it has broad applications in various fields and activities. On an arbitrary equigeopotential surface, there does not exist the frequency shift of an electromagnetic wave signal. However, between arbitrary two different equigeopotential surfaces, there exists the frequency shift of the signal. Just due to this principle of nature, one can determine the geopotential difference as well as the orthometric height difference between two separated points P and Q using electromagnetic wave signals, especially the GPS signals. GPS signals with a definite frequency f are emitted and two receivers at P and Q on ground receive the signals coming from the emitter simultaneously. The frequencies of the signals are recorded by receivers at P and Q, and consequently the frequency difference (shift) between the received frequencies of the signals at P and Q is determined. Then, the geopotential difference between these two points is determined based on the geopotential frequency shift equation, and the corresponding orthometric height difference is further determined based on the Bruns' formula. Further, using this approach a unified world height datum could be realized, because P and Q could be chosen quite arbitrarily, e.g., they are located on two separated continents or islands.

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