[time-nuts] Low cost GPS module for < 100ns timestamping error
David J Taylor
david-taylor at blueyonder.co.uk
Sat May 3 01:50:57 EDT 2014
I'm considering designing and building some dataloggers, probably ARM
Cortex based (eg. STM32F4xx), which record the time of infrequent
events, preferably to better than 100ns and if possible better than
50nS. The data loggers will be continuously powered, in fixed locations
and should have reasonably good views of the sky so the use of a low
cost GPS module should be feasible. I believe it shouldn't be too
difficult to resolve the PPS timing to +/- 5ns or better with a 100MHz+
microcontroller clock, but obviously jitter would add to the error
requiring the GPS to be better than perhaps 90ns or so worst case.
The MAX-7Q has a TCXO and works well as a PPS source.
or perhaps the MAX-M8Q but I've not played with one of those.
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Email: david-taylor at blueyonder.co.uk
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