The effects of geography on spectrum-orbit utilizationWith over forty satellites in geostationary orbit, and many more planned, it is becoming increasingly difficult to find suitable orbit positions for new systems operating at 4 and 6 GHz. Efficient spectrum-orbit utilization can be achieved with frequency-reuse techniques - orthogonal polarization, earth-station antenna discrimination, and satellite antenna discrimination - provided that service-area geography is considered. Service arc - that portion of the orbit which affords useful service to all points in a given area - is a function of the area's climate, terrain, and location as well as its size and shape. Of the three techniques, satellite antenna discrimination is the most sensitive to these factors. According to the BSS (broadcasting-satellite service) antenna reference pattern, the maximum discrimination possible is the on-axis gain, which can be as high as 49 dB for a beamwidth of 0.6 degrees, or as low as 32 dB for a 3.5-degree beamwidth. Unlike the Fixed-Satellite Service (FSS), the BSS will normally have beams that cover no more than one or two time zones.
Document ID
19810037504
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Sawitz, P. H. (ORI, Inc. Silver Spring, Md., United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1979
Subject Category
Communications And Radar
Meeting Information
Meeting: NTC ''79; National Telecommunications Conference