Land mobile satellite systems are being designed to provide communictions to operators of moving vehicles throughout the United States and Canada. Major potential difficulties facing such systems are signal attenuation caused by roadside trees that intercept the line-of-sight signal path and multipath fading caused by multiply reflected signals in hilly and mountainous terrain. This article describes the results of a series of four propagation tests carried out jointly by APL and the University of Texas at Austin during 1985-86. The tests used remotely piloted vehicles and helicopters to simulate a transmitter satellite source platform. The first test was designed to measure the signal degrdation by individual trees at the NASA Wallops Flight Facility, Wallops Island, Va. During the second and third tests, the emphasis was on attenuation caused by roadside trees when the vehicle was moving. The fourth test examined multipath effects in the hilly and mountainous terrain around Boulder, Colo.


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    Title :

    Propagation degradation for mobile satellite systems


    Additional title:

    Ausbreitungsdaempfung bei mobilen Satellitenfunk-Systemen


    Contributors:

    Published in:

    Publication date :

    1988


    Size :

    9 Seiten, 14 Bilder, 12 Quellen


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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