Yo Hans! On Fri, 21 Nov 2025 23:04:28 +0100 Hans Mayer <[email protected]> wrote:
> So I decided I give it a try again after years.
> My environment is an U-BLOX ZED-F9P (PROTVER=27.12)
> with an antenna HAB-ANN-MB-00-00 fix mounted on the top of the roof
> of my house.
Which F9P model? L1/L2, or L1/L5. With or without SBAS?
Did you verify the correct signals were enabled. As in:
ubxtool -g CFG-SIGNAL
https://gpsd.io/ubxtool-examples.html#_checking_constellations_gen9
Got the dynamic model set to fixed? Like this:
ubxtool -g CFG-NAVSPG-DYNMODEL,0
https://gpsd.io/ubxtool-examples.html#_gen9_7
> I did run twice a measurement as described in example 1 of the man
> page. The first with 12 hours 46 min and the second with 12 hours.
> This was the command line I used:
> gpsrinex -i 30 -n 1440 --ant_num 2 --observer mayer --ant_type
> HAB-ANN-MB-00-00 localhost:gpsd:/dev/serial0
Looks good. But the ant-type is not one of the "official" choices.
> When I got the first result I was impressed.
> I got a 95% sigma of 12 mm for lat and 10 mm for long.
> So I started a second run with 12 hours.
> There I got 15 mm and 22 mm as result of sigma. Not so bad I thought.
> But then I calculated the distance between this two geolocations.
> And the result was disillusioning. The distance is 164 mm , far away
> of this 95% sigma.
Wow. First I have heard of anyone doing that. Disappointing. I'll
have to give that a try, I nevver thought to compare two runs.
> About 2 years ago I tried to find the accurate position by averaging.
> I run 12 times 24 hours measurements.
> When I calculate the distance between this result and the gpsrinex
> result I get more than half a meter.
> So I am not sure what I should believe what is true and what is wrong.
"A man with more than one watch never knows what time it is."
There is a USGS benchmark near me, for a long time I thgouht I should
run a test with my antenna over the known position. Uh, oh. Looking
at that benchmark, it does not have any accuracy specified...
> And there is another question.
> At the Canadian PPP service I read now they support GLONASS and
> Galileo too.
So they say. Did not work for me last time I tried.
> So I left both systems in the config enabled. But the final report
> didn't list them.
Dunno what's with that. I have emailed them a few times. But the
operators have zero clue as to what the program they run actually
does.
RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
[email protected] Tel:+1 541 382 8588
Veritas liberabit vos. -- Quid est veritas?
"If you can't measure it, you can't improve it." - Lord Kelvin
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