[ntp:questions] Single GPS/PPS time source gets marked as a falseticker
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Thu Jul 14 18:34:45 UTC 2011
On 7/14/2011 9:46 AM, Uwe Klein wrote:
> Rob wrote:
>> The native binary protocol usually has a SPECIFICATION
>> about the time field in the messages (like: it is the
>> current time at the moment the beginning of the message
>> is leaving the receiver). The NMEA protocol has a
>> "time of fix", and that tells you nothing about what
>> time it is now.
> $GPZDA ?
> imho binary protocols oftentimes add more problems than
> they solve. more delay != more uncertainty
Some GPS chips, e.g. SiRF III (Garmin has used that in the past),
only allow you to set the (dozen?) messages' update rates
to a range (one every second to one every thirty seconds,
not turn them off, so, you get a bunch of message you don't
want / need every so often, and there appears to be nothing
else you can do about it.
However, on the same chip, in NMEA mode, you can turn the
message off with a update rate of zero;
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