An all-digital Manchester symbol synchronizer for Space ShuttleThe Shuttle S-Band relay communications links via TDRS are coded and may operate at symbol signal-to-noise ratios (Es/No) as low as -5dB. A brass-board all-digital bit synchronizer with very low (0.05dB) degradation relative to an idealized analog model has been designed to process the 216 KBPS Manchester data symbols. This all-digital bit synchronizer, which provides soft decision detected outputs to a convolutional decoder, may be operated at any rate below 216 KBPS by merely changing the master clock frequency.
Document ID
19750035405
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Batson, B. H.
Vang, H. (NASA Johnson Space Center Houston, Tex., United States)
Cellier, A. (TRW Systems Group Redondo Beach, Calif., United States)
Lindsey, W. L. (LinCom, Inc. United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1974
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking