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Spacelab high density digital recordersThe design and performance of the high-density digital recorder (HDDR) developed for use at the NASA centers (KSC, JSC, and GSFC) and at the JPL to store and retrieve 50-Mb/s PCM data streams from the Spacelab experiments are reported. The recording reproduction, and transport requirements are reviewed; and the design solutions adopted in the final version of the HDDR are described, incuding three-position-modulation and Y-phase encoding, microprocessor-controlled automatic bit synchronization and equalization, cyclic-redundancy-check error detection and correction, clock regeneration, data and clock variations, tape-speed control, and EEE-488 remote control. Reliable performance, with bit error rates 1 in 10 to the 10th forward and 1 in 10 to the 9th reverse or better and packing density up to 50 percent greater than that obtainable using conventional codes, is reported after 1.5 years of service.
Document ID
19840063856
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Blais, R. A.
(NASA Kennedy Space Center Engineering Development Directorate, Cocoa Beach, FL, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1983
Subject Category
Instrumentation And Photography
Accession Number
84A46643
Distribution Limits
Public
Copyright
Other

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