GEOSTAR/LOCSTAR
o Electronic package for 2-way information transfer on communication satellites
o Limited coverage for subscribers
o U.S. and French initiative
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Los que requieren comunicación bidireccional . En ellos, las estaciones centrales "interrogan" a los usuarios cuyos transmisores/receptores "contestan". Sus respuestas son analizadas por las estaciones centrales quienes determinan la posición de los mismos y se la transmiten. A estos sistemas se les denomina RDSS (RadioDeter-mination Satellite Services). Dentro de este grupo están los sistemas GEOSTAR, STARFIX, EUTELTRACS, el servicio de posicionamiento INMARSAT-Standard-C y el sistema Argos.
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Book:
The Air Pilot's Guide to Satellite Positioning Systems
A complete understanding of any new technology begins with an understanding of the basic underlying principles of the subject. This book aims to explain the fundamentals behind the operation of satellite positioning systems, detailing how they have evolved and, perhaps even more importantly, how they are likely to develop into the next century. Starting with a basic introduction to position fixing from a navigational viewpoint, the author then explains the concept of satellite derived position fixing with particular emphasis on GPS. Other satellite systems such as the Global Navigation Satellite System (GLONASS), Immarsat, Geostar/Locstar are also examined and the book concludes with a study of satellite applications for navigation in aviation. With photographs, line drawings, tables and graphs throughout. Soft. 198 pages.
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Systémy družicovej navigácie: Transmit, Glonas, Geostar, Locstar, Granas, Navsat, Starfix, Omnitracs, Euteltracs, GNSS, základné charakteristiky.