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    CALIBRATION ISSUES FOR MILLIMETER WAVE EARTH TERMINALS

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    Author
    Wait, D. F.
    Baird, R. C.
    Daywitt, W. C.
    Newell, A. C.
    Perera, S.
    Repjar, A. G.
    Affiliation
    CyberLink Corporation
    Issue Date
    1986-10
    
    Metadata
    Show full item record
    Rights
    Copyright © International Foundation for Telemetering
    Collection Information
    Proceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection.
    Publisher
    International Foundation for Telemetering
    Journal
    International Telemetering Conference Proceedings
    Abstract
    The National Bureau of Standards (NBS) has investigated the calibration and measurement support requirements of millimeter wave satellite systems such as MILSTAR. Essentially three new measurement problems arise because of operating in the upper SHF and EHF frequency ranges. First, without adequate methods to measure the atmospheric loss, the accuracy of EIRP measurements in the 20 GHz to 45 GHz range can be no better than 0.5 dB to 3 dB (depending on frequency and antenna elevation angle). The atmosphere absorbs and scatters radiation traveling through it, both reducing the magnitude of and depolarizing a received signal. Second, standards, measurement support services, and some measurement techniques are not presently available from NBS and they are needed to support millimeter wave antenna gain and thermal noise measurements. Of special concern are the effects of connectors and adapters, since they can introduce significant errors into mm-wave measurements. Theird, if the sun and/or moon are to be used for measuring earth terminal G/T, earth terminal antenna gain, or satellite effective isotropic radiated power in the millimeter region, they need to be appropriately characterized at those frequencies. The sun and moon are only useful as measurement sources for antenna systems with gains less than about 50 dB, but most MILSTAR systems are expected to fall in this category.
    Sponsors
    International Foundation for Telemetering
    ISSN
    0884-5123
    0074-9079
    Additional Links
    http://www.telemetry.org/
    Collections
    International Telemetering Conference Proceedings, Volume 22 (1986)

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