In reviewing the NIST document, I don't see anything particularly
difficult about the new format - either in terms of extracting the time
or phase/frequency information from the transmissions. With
undersampling, carrier recovery (to determine phase and amplitude
information) should be do-able even with a fairly low-end microprocessor.
It occurred to me that, as was the case with the old format, this new
one could *still* be implemented entirely in glue-logic LSI hardware
(think "7400" or "4000" series): True, it would take several dozen
chips to do this, but it would be perfectly do-able - even the
implementation of parity.
The tricky part would be the conversion of the seconds to usable
time/date with glue logic - but then again, a bit of clever use with
lookup ROMs (violating the glue logic premise a bit!) could clear that up.
About the only part that is "unknown" is the message format - which is
not essential to the operation of any receiver in terms of determining
time/frequency - which would be interesting to know more about.
Clint
KA7OEI
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