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Syledis : ウィキペディア英語版
Syledis

Syledis (SYstem LEger pour mesure la DIStance) was a terrestrial radio navigation and locating system. The system operated in the UHF segment of 420-450 MHz. It was manufactured in France by Sercel S.A. and was operational during the 1980s and until about 1995, providing positioning and navigational support for the petroleum sector in the North Sea and to other scientific projects. Syledis has been replaced by GPS.
== Functioning ==
Determination of the position of mobile vehicles, like f.e. vessels, using Syledis is accomplished by measurement of transit time of radio waves between mobiles and radio stations at known points. There are two modes of operation, ''active range mode'' and ''passive pseudo-range mode''.

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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