[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [gpsd-users] inspect rtcm messages going to zed-f9p

From: Gary E. Miller
Subject: Re: [gpsd-users] inspect rtcm messages going to zed-f9p
Date: Thu, 18 Apr 2019 12:35:59 -0700

Yo Svenn!

On Thu, 18 Apr 2019 11:52:12 +0200
Svenn Are Bjerkem <address@hidden> wrote:

> I am closely following the development on git so I may be a tad bit
> early with my question.

Good to know.

> I try to use the ntrip:// functionality of gpsd to send correction
> data to the f9p. My gps board has a led which turns off when the gps
> is able to use the correction data. With u-center I have tested that
> the ntrip login data I provide give rtk solution. (the no-rtk led
> turns off). So far the led does not go off with gpsd.

I played with ntrip a long time ago and found it near useless.  Feel
free to play with it, submit patches, and prove me wrong.

Not much I can do on it directly as I have no ZED-F9P or NTRIP source.

Pretty much no guidance from u-blox on how to configure ntrip.
Section here:


> I guess the f9p is using some very new rtcm sentences and I wonder if
> these are compiled into the rtcm3 driver of gpsd or if they can be
> configured in some way. I also wonder if there is a way to see in any
> log that rtcm is actually fetched from the caster and provided to the
> gps attached to gpsd.

A quick look at the file net_ntrip.c shows that gpsd does not know about
version 3.3. gpsd sees .3 and just gives up.  Line 246.  The ZED-F9P
requires 3.3, plus some proprietary messages.  Someone that understands
NTRIP will need to fix that.

As always, when in doubt about what gpsd is doing, just turn up the 
debug level:
        # gpsd -nND 4 /dev/ttyS0

Best to capture to a file (nohup, etc.) and examine after a test run.
Search for the case insensistive string: ntrip.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin

Attachment: pgpL_riwIjThz.pgp
Description: OpenPGP digital signature

reply via email to

[Prev in Thread] Current Thread [Next in Thread]