Survey is pretty much a bad thing while in motion :)
Some (but not all) GPS modules allow you to set up in a “mobile / do not
survey” mode. This is one area that the
newer ( = not 1997 era) devices do much better at. It also is something that
SBAS / EGNOS / WAAS may indeed
help you out on. You may be changing *many* settings on the part to make it
behave in a mobile setting. There
are a few bugs you just may turn up while doing this ….
> On Oct 17, 2016, at 1:38 PM, Nick Sayer via time-nuts <email@example.com>
> Speaking for my GPSDOs specifically, you can’t disable the survey mode with
> the Venus838 receiver (well, you can, but it requires you to talk to the
> module with SkyTraq’s software, which requires disabling the GPSDO’s
> controller - possible to do, but annoying). I haven’t attempted to see what
> it would do if it were moved after the survey is completed (if you move
> during the survey, then the survey will fail and repeat).
> The older GPSDOs that had PA6H receivers were navigation receivers that
> didn’t have a survey mode.
> In either case, without a surveyed position, PPS stability will suffer
> if/when the constellation degrades due to poor reception, which can happen
> if, say, the unit is in a moving vehicle in interesting terrain. Poor PPS
> stability will have an impact on the PLL, obviously.
>> On Oct 16, 2016, at 9:19 PM, Joseph Gray <jg...@zianet.com> wrote:
>> I'm curious to know how accurately a GPSDO will keep its 10 MHz output
>> while moving. No initial survey to set a position would be done. I
>> don't care about the UTC time.
>> Joe Gray
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