[time-nuts] Low cost GPS module for < 100ns timestamping error

David J Taylor david-taylor at blueyonder.co.uk
Sat May 3 05:50:57 UTC 2014

-----Original Message----- 
From: Tony 
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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