Yo Nick!
On Fri, 10 May 2024 13:14:48 +0100
Nick Taylor <nicktaylor@dataskill.uk> wrote:
Could you cast your memory back to Dec 2022 - we found that using
NMEA feed we weren't getting satellite data although there was used
satellite count available...
Yeah, Sats Seen and Sats Used just gets worse and worse.
You kindly made a patch to pick this up as used satellite count if
the satellite data wasn't available (see screenshot attached)
I can'read read your screenshot, my eyes are going bad and that is way
to grainy for me to read. And I certianly can't cut/paste the
commit number from a course image.
On recently upgrading to latest gpsd release it seems that something
has changed that makes used satellite count disappear again - we pick
this up from gpslib variable gps_data_t.satellites_used
And it is only going to get worse. Newer receivers can never seem to
report sat counts consistently. I have one receiver here that reports 4
different sat counts in the same epoch. Which is correct?
This gets more complicated when the receiver can pick up 3 signals (L1,
L2 and L5) from the same sat. Should that be reportd as 1 sat, or 3?
For now, gpsd leans to reporting 3, except that not all new multi-frequency
receivers report enough data to know which is which.
I'm also attaching output from gpspipe -R
That looks good. I'll play with that today.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
gem@rellim.com Tel:+1 541 382 8588
Veritas liberabit vos. -- Quid est veritas?
"If you can't measure it, you can't improve it." - Lord Kelvin