[time-nuts] Encoded 1PPS signals
clayton at isnotcrazy.com
Tue Jun 26 13:15:32 UTC 2012
I have been building an LF transmitter, and have provision for a 1PPS input
for calibration purposes. However I would like to be able to provide more
time information than just the second pulses. It occurs to me that full time
info could be encoded onto a 1PPS stream by changing the width of the pulse
itself. The rising edge can be left unchanged to indicate the precise
second, but the trailing edge can vary between (say) 100mSec and 300mSec,
and this could encode 60 bits (with suitable idle pulses etc for
synchronisation) in each minute. Using this I could encode full date and
time into the 1PPS stream.
My question is, does such a standard already exist, or has anyone developed
something along this line?
If no, I plan to implement something suitable myself, and will publish it
should it be useful to others.
More information about the time-nuts