Abstract
Recent evolutions in market areas of Direct to Home (DTH), Geo Mobile, and Internet Access has dictated that satellites serving these markets offer higher receiver sensitivity, greater effective isotropic radiated power (EIRP), and extensive frequency reuse. Satellites with multiple spot beams address these demands. However, as the beam size is reduced and the frequency reuse is increased the requirements for more efficient mass utilization and greater pointing stability become more stringent. Electric propulsion is sought as a means to meeting these requirements. A thorough understanding of RF emissions from electric propulsion systems is necessary when implementing electric propulsion on communication spacecraft. Space Systems/Loral (SS/L), in three phases has characterized the emissions of stationary plasma thrusters (SPT-100) developed by Design Bureau Fakel. The parameters characterized include emissions polarization, directivity, magnitude, burstiness, and coherency. This paper summarizes the tests and conclusions of all three phases supporting SS/L's ability to confidently implement electric propulsion on a wide spectrum of communication and meteorological satellites.
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