[time-nuts] Re: Knowing when the PPS signal is locked to the satellite.

[Dave]

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.
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe send an email to time-nuts-leave at lists.febo.com