NASA NTRS · 19750035405
An all-digital Manchester symbol synchronizer for Space Shuttle
Abstract
The 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.
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Batson, B. H., Vang, H., Cellier, A., Lindsey, W. L.. 1974-01-01. An all-digital Manchester symbol synchronizer for Space Shuttle. https://ntrs.nasa.gov/citations/19750035405
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