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Re: [gpsd-users] debugging apparent lack of multiconstellation support
From: |
Gary E. Miller |
Subject: |
Re: [gpsd-users] debugging apparent lack of multiconstellation support |
Date: |
Tue, 2 Jul 2019 20:40:00 -0700 |
Yo Ben!
On Tue, 2 Jul 2019 18:19:08 -0700
Ben Crowell <address@hidden> wrote:
> I've built myself a Raspberry Pi-based handheld GPS device, and am
> having lots of fun. Thanks to those on this list who have helped to
> create and maintain this useful piece of software. My own client
> software is here
> https://github.com/bcrowell/brownie
Cool. How do I run it? I get this:
# sh brownie_display.sh
/usr/lib/python-exec/python3.6/python: can't open file
'/home/pi/Documents/programming/brownie/brownie_display.py': [Errno 2] No such
file or directory
Looks like you hardcoded some paths?
> and my hardware is described here:
> https://www.instructables.com/id/Handheld-GPS-With-EInk-Display/
Interesting. Still using the U-blox NEO-6M GPS board?
> One of my goals for this project was multiconstellation support, but
> it seems like that is not working. The purpose of this email is to
> ask for pointers about diagnosing or fixing this.
To start, the NEO-6M only supports GPS. What GPS are you using?
> My reason for thinking that multiconstellation is not working is that
> when I look at some sample gpsd_json data records from my receiver,
> the PRN always seems to be in the range from 1 to 64.
Not working for you. Works fine for me on u-blox 8, u-blox 9 and
Javad GPS.
> Lack of hardware support? I have a ublox NEO-6M chip.
Oh, yeah. Way too old. For about $15 you can get a NEO-M8N that
supports multi-gnss.
> Out of date software? I have gpsd 3.16.
Oh, yeah. That is over 4 years old. Older than most of the new GNSS
sats. You pretty much need the latest: 3.19.
> Need to turn on some feature?
Nope. Default build should be fine. Don't trust any distro build.
> I notice that in the gpsd_json
> documentation at https://gpsd.gitlab.io/gpsd/gpsd_json.html , there
> are a lot of fields in the "satellite" class that say "no" under
> "Always?"
Yup. Very dependent on your GPS/GNSS device.
> Is there some way to turn these on?
u-blox does use eFuses to selectively enable features. But the 6 is
so old you are out of luck. Plus the eFuses are undocumented...
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
address@hidden Tel:+1 541 382 8588
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"If you can’t measure it, you can’t improve it." - Lord Kelvin
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