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Demand Assignment in the ACTS LBR SystemOn the Advanced Communications Technology Satellite (ACTS) being developed at NASA Lewis, low-burst-rate (LBR) traffic stations will access the ACTS multibeam package via two hopping beams that can be directed at certain areas in the continental U.S. An onboard baseband processor (BBP) demodulates uplink traffic, switches it between uplink and downlink beams at baseband, and then remodulates it for retransmission at 20 GHz. This study describes the demand-assigned operation of the ACTS LBR system, where the onboard switch is remote from both traffic stations and master control station (MCS). Network control uses inbound and outbound orderwire channels and a BBP control channel, allowing the MCS to coordinate assignment of individual 64-kb/s spacecraft channels. Models are developed to simulate the dynamics of the assignment process and verify the call blocking behavior, to predict control channel loads, and to evaluate algorithms for burst time plan rearrangement.
Document ID
19900056108
Acquisition Source
Glenn Research Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
White, Lawrence W.
(COMSAT Laboratories Clarksburg, MD, United States)
Palmer, Larry C.
(COMSAT Laboratories Clarksburg, MD, United States)
Date Acquired
August 14, 2013
Publication Date
May 1, 1990
Publication Information
Publication: IEEE Transactions on Communications
Volume: 38
ISSN: 0090-6778
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Accession Number
90A43163
Distribution Limits
Public
Copyright
Other

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