Problem
has been resolved. I now get a solid 3D fix.
?
The
solution: update to the latest revision of GPSD. Revision
3.23.1
?
As
background, I have a Garmin GLO 2 which will support up to
four users. A similar unit is the Dual XGPS160. I have used
it in the past for an Android tablet with the hopes of also
sharing with an RPi. Currently, The tablet, RPI and my PC
are receiving data.
?
I
was asked why I would use a GPS like this. When running
multiple RPIs, which may not have sky view, a GPS with a
view can share with each.
?
Best
regards,
Fred
N7FMH
?
?
?
?
GPS
has been running for at least a day.
Define "GPS has been running for at least a day".? By default,
your GPS puck won't be activated by gpsd and start listening
for GPS details until it has a listening client like direwolf,
cgps, gpsmon, etc.? This seems to be a default for minimizing
power consumption.? The gpsmon tool doens't show how long it's
been running with a 3D fix but cgps does.
The GPS has had a device connected
to a device. It supports 4 different devices. One device is
the same RPi Direwolf is running on but is an terminal
window on my PC with cgps running. Now a second
device (PC/u-center) is connected.
?
?
What
constitutes a ¡°very good¡± lock?
That's evidently a huge topic in itself and is well outside
the scope of this Direwolf.? I did a search for "gpsd 3d lock"
and this hit seems like a good start:
??
A key point in that article is that though your system lists
it's using X satellites, it doesn't mean it's hearing them
well.? This can be due to local RF interference, etc.?
I can see I have a 3D position all
the time now that my Windows PC is connected. I am aware of
the FIX differences and how everything can affect the
satellite signal; trees buildings, angle of antenna, etc.
Not being snarky! If this was a serial GPS or a USB-GPS
(serial?) there would be no BT layer and for serial, using /dev/ttyS0
would be correct and USB
would be similar. Based on an exchange with Robert KB8RCO it
seems this maybe the case here. If may be that each of the
four possibilities need /dev/ttys0-3? In the end, I will
have learned a little more.
?
This
is what I get when running gpsmon. Any clues there?
More information is available in cgps but there are other
tools available to troubleshoot GPS issues such as gpsprof but
I've never used them.? Ultimately, I don't think your issue is
with Direwolf.. it's going to be somewhere in the GPS into
GPSD area.? I would start here:??
I will
certainly check this group. From my PC experience on needing
to actually connect to a COM port, I wonder if a RPi
¡°comport¡± must be connected as well. Robert, KB8RCO,
suggested something regarding auto-connecting at reboot but
I haven¡¯t chased that since the basic connection is not
functional yet.
?
Thank you!
?
Fred N7FMH
Screenshots from the u-blox
u-center app:
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