Thanks all for the tips I'll investigate over the next couple of days.
Dave
On 22/06/2022 15:48, Matthias Welwarsky via time-nuts wrote:
On Mittwoch, 22. Juni 2022 14:59:29 CEST Dave via time-nuts wrote:
I am using a NEO-6M to provide a PPS signal for an experiment but I need
to know when it is locked or not.
Does anyone know if there is a way to find out from either the NMEA data
stream or via the proprietary protocol ??
You can check e.g. the UBX-NAV-PVT message, if will tell you if the receiver
has a valid UTC time and also the time uncertainty and what type of fix
generated the nav solution. Or, UBX-NAV-TIMEUTC. Or, just UBX-NAV-STATUS.
You can assume that as soon as a 3D or TIME fix is reported, the PPS is locked
to GPS, or once the time uncertainty drops below a certain threshold.
Note that this is what an M8 receiver will provide. I don't have any manual
for the M6 receivers at hand, so the actual messages might be different for a
M6 which supports a different protocol version than the M8.
At the moment I have it programmed to only provide a PPS signal when it
is locked (or nothing if not) and monitor
the PPS signal in the microprocessor, but it's not entirely satisfactory
and I need a better mechanism.
That's not a bad mechanism actually. The PPS output is practically useless
while the receiver is not locked to GPS.
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