Physics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994tdar.nasa..121s&link_type=abstract
In its The Telecommunications and Data Acquisition Report p 121-127 (SEE N94-29652 08-32)
Physics
Bit Synchronization, Channels (Data Transmission), Communication Networks, Convolution Integrals, Deep Space, Error Detection Codes, Galileo Project, Reed-Solomon Codes, Signal To Noise Ratios, Space Communication, Space Missions, Viterbi Decoders, Galileo Spacecraft, Synchronism
Scientific paper
The Consultative Committee for Space Data Standards (CCSDS) recommends that space communication links employ a concatenated, error-correcting, channel-coding system in which the inner code is a convolutional (7,1/2) code and the outer code is a (255,223) Reed-Solomon code. The traditional implementation is to perform the node synchronization for the Viterbi decoder and the frame synchronization for the Reed-Solomon decoder as separate, sequential operations. This article discusses a unified synchronization technique that is required for deep space missions that have data rates and signal-to-noise ratios (SNR's) that are extremely low. This technique combines frame synchronization in the bit and symbol domains and traditional accumulated-metric growth techniques to establish a joint frame and node synchronization. A variation on this technique is used for the Galileo spacecraft on its Jupiter-bound mission.
Belongie M. L.
Chauvin T. H.
Cheung Kar-Ming
Rabkin J.
Statman J. I.
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