[ntp:questions] NTP, GPSD & PPS

David Taylor david-taylor at blueyonder.co.uk.invalid
Tue Dec 9 19:56:39 UTC 2014

On 09/12/2014 17:48, William Unruh wrote:
> On 2014-12-09, David Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
>> On 09/12/2014 16:49, Paul wrote:
>> []
>>> Unless someone needs to share position and velocity data
>>> I don't understand why gpsd is used to proxy NMEA data.  The NMEA (or ATOM)
>>> driver is sufficient.
>> Paul, does the NMEA (or ATOM) driver solve the problem of having perhaps
>> a couple of hundred milliseconds peak-to-peak jitter in the GPS serial
>> data, thereby preventing NTP using the PPS source?
> ??? It does use the pps source. nmea data will always have huge (on ntp
> scale) jitter. And what evidence is there of preventing using the PPS
> source?

I tried with the type 46 driver, and the PPS was rejected because the 
NMEA part was rejected.

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