DIFFERENTIAL ENCODING REVEALED: AN EXPLANATION OF THE TIER-1 DIFFERENTIAL ENCODING IN IRIG 106
AffiliationBrigham Young University
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AbstractIRIG 106-04 specifies differential encoding for use with the interoperable Tier-1 modulations to deal with phase and delay-axis ambiguities associated with PLL-based carrier phase synchronization. The origins of the differential encoding have been shrouded in the mists of an unavailable technical report and a mysterious connection to previous published work in the open literature. This paper removes the mystery by showing that the differential encoding rule results from encoding bit-by-bit transitions in the phase trajectory of an offset QPSK modulated carrier.
SponsorsInternational Foundation for Telemetering