GMU - ECE 739, Fall 2003 - Satellite Communications Class ...

GMU - ECE 739, Fall 2003 - Satellite CommunicationsClass: Nov-17-2003(C) Leila Z. Ribeiro, 20031 ECE 739 Fall 2003 Satellite CommunicationsLecture 11 Earth Station Technology, VSATs and Network ArchitecturesDr. Leila Z. RibeiroNovember 17, 20032 Agenda Earth station design Earth station types VSATs Satellite networksEarth Station Design4 Earth Station Technology Recall from previous classes:srttTGRkBGPNC24 = This is the ratio that interests us hereThe ratio between the gain of the antenna , Gr, and the system noise temperature, Ts, is often referred to as the quality factor of the earth station antennaGMU - ECE 739, Fall 2003 - Satellite CommunicationsClass: Nov-17-2003(C) Leila Z. Ribeiro, 200325 Earth Station StandardsService Earth Station TypeApproximate G/T (dB/K)CommentsFSSL arge40 Medium30 Small25 Very Small20 Transmit/ReceiveVery Small12 Receive onlyMSSM obile Earth StationLarge-4 Tracking RequiredMedium-12 Tracking RequiredSmall-24 Without TrackingBSSUser Earth StationLarge15 Used for community receptionSmall8 Used for individual reception6 Earth Station Design Considerations Type of service (FSS, MSS, etc.)

Lecture 11 Earth Station Technology, VSATs and Network Architectures Dr. Leila Z. Ribeiro ... sub-reflector 12 • Gain, G, of an antenna influenced by 1) antenna dimensions, ... • Typically reflector antennas – Cassegrain types becoming popular

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