Spectrum Efficiency Metrics


Consumed Orbital Arc for Geostationary Satellite Systems



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Consumed Orbital Arc for Geostationary Satellite Systems


When a geostationary satellite at a particular orbital position (“orbital slot”) is providing service to a given service area using a portion of the frequency spectrum, there is an orbital arc exclusion range surrounding that orbital position from which no other geostationary satellite can provide service to the same service area using the same frequency spectrum due to inter-system RF interference. "Consumed orbital arc," therefore, is that portion of the geostationary orbital arc for which a satellite denies access to another co-frequency satellite seeking to serve the same geographic region. The size of this orbital arc exclusion range must therefore be included as an additional efficiency consideration when evaluating the spectrum efficiency metric of satellite systems. The size of the orbital arc exclusion range will be substantially greater for mobile service satellite systems, in which omni-directional antennas are employed by the user terminals, relative to fixed service satellite systems, in which narrow beamwidth antennas are employed by the user terminals.



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