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・ Dorippoidea
・ Doriprismatica
・ Doriprismatica atromarginata
・ Doriprismatica dendrobranchia
・ Doriprismatica kulonba
・ Doriprismatica paladentata
・ Doriprismatica plumbea
・ Doriprismatica sedna
・ Doriprismatica sibogae
・ Doriprismatica stellata
・ Doriprismatica tibboeli
・ DORIS
・ Doris
・ Doris (album)
・ Doris (gastropod)
DORIS (geodesy)
・ Doris (Greece)
・ Doris (mythology)
・ Doris (opera)
・ Doris (sailing yacht)
・ Doris (singer)
・ Doris (TV series)
・ Doris A. Davis
・ Doris Abrahams
・ Doris Akers
・ Doris Akol
・ Doris Allen
・ Doris Allen (politician)
・ Doris Allen (singer)
・ Doris Anderson


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DORIS (geodesy) : ウィキペディア英語版
DORIS (geodesy)

Doppler Orbitography and Radiopositioning Integrated by Satellite or, in French, Détermination d'Orbite et Radiopositionnement Intégré par Satellite (in both case yielding the acronym DORIS) is a French satellite system used for the determination of satellite orbits (e.g. TOPEX/Poseidon) and for positioning.
==Principle==

Ground-based radio beacons emit a signal which is picked up by receiving satellites. This is in reverse configuration to other GNSS, in which the transmitters are space-borne and receivers are in majority near the surface of the Earth. A frequency shift of the signal occurs that is caused by the movement of the satellite (Doppler effect). From this observation satellite orbits, ground positions, as well as other parameters can be derived.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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