The effects of Viterbi decoder node synchronization losses on the telemetry receiving system

Details The effects of Viterbi decoder node synchronization losses on the telemetry receiving system The effects of Viterbi decoder node synchronization losses on the telemetry receiving system

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982tdar.nasa...17d&link_type=abstract

In its The Telecommun. and Data Acquisition Rept. p 17-24 (SEE N82-25092 15-99)

Physics

Decoders, Decoding, Frequency Synchronization, Nodes (Standing Waves), Signal To Noise Ratios, Viterbi Decoders, Algorithms, Deep Space Network, Spacecraft Tracking, Synchronizers, Voyager 2 Spacecraft

Scientific paper

The Viterbi decoders currently used by the Deep space Network (DSN) use an algorithm for maintaining node synchronization that breaks down at bit signal-to-noise ratios (SNRs) of about 2.0 dB. It is shown that this can become an important consideration when the effects of noisy carrier referencing are combined with the lower SNRs that are expected at Voyager 2 Uranus and Neptune encounters. Depending on the available carrier power, node synchronization losses of between 0.85 and 1.25 dB can be expected in addition to the radio loss.

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