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Techniques for transmitting digital data on the Spacelab's analog video channelA study was made of various techniques for transmitting digital data over a composite video channel. Transmitting data from experiments on the Space Shuttle Orbiter over a video channel is attractive since extra channel capacity is needed. Broadcast television telecommunications schemes and other techniques described in the literature were reviewed and compared. PSK (Phase Shift Keying), MPSK (m-ary PSK), or PAM (Pulse Amplitude Modulation) can be transmitted on visible lines of a frame, unassigned lines of the VBI (Vertical Blanking Interval), or during the HBI (Horizontal Blanking Interval). All three modulation techniques can be attractive under the proper conditions. However, PAM on visible lines or during the VBI should be relatively easy to implement, provide adequate average data rates, and give acceptable BERs (Bit Error Rates).
Document ID
19930066826
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Smith, Dean L.
(Memphis State Univ. TN, United States)
Hanby, Walter D.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 16, 2013
Publication Date
May 1, 1993
Publication Information
Publication: IEEE Aerospace and Electronic Systems Magazine
Volume: 8
Issue: 5
ISSN: 0885-8985
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Accession Number
93A50823
Distribution Limits
Public
Copyright
Other

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