Spectrum Efficiency Metrics


Consumed Field of View for Geostationary Satellite Systems



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Consumed Field of View for Geostationary Satellite Systems


A given geostationary orbital position (“orbital slot”) has a potential service field of view10 that is the approximate one-third of the earth’s surface that is visible from that orbital position. A satellite placed at that orbital position will be designed to use a particular portion of the frequency spectrum to provide service to a defined service area, which will be a portion (subset) of the field of view. No other satellite placed at that same orbital position can use the same portion of the frequency spectrum to provide service to the same service area. If a second satellite is placed at approximately that same orbital position to re-use the same frequency spectrum to serve a different service area within the same field of view11, there will be a service exclusion zone surrounding the defined service area of the first satellite that cannot be served by the second satellite due to inter-system RF interference.12 "Consumed field of view," therefore, is the geographic region for which a satellite denies access to another co-frequency satellite operating at the same geostationary orbital location ("slot"). The size of this service exclusion zone relative to the service area and the service field of view must therefore be included as an additional efficiency consideration when evaluating the spectrum efficiency metric of satellite systems.



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