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Re: [gpsd-users] Coding Question

From: Gary E. Miller
Subject: Re: [gpsd-users] Coding Question
Date: Tue, 5 Feb 2019 14:15:34 -0800

Yo Roland!

On Tue, 5 Feb 2019 13:22:30 -0800
Roland Oswald <address@hidden> wrote:

> The RTCM is coming from somewhere on campus I believe, UC Riverside.

Good.  In what form?  NTRIP?  Raw RTCM?  What message types?  From
how good a base station?

If it is raw RTCM, then just feed into the u-blox on the second port.
If the u-blox is setup as rover then it just take the RTCM.

As the u-blox doc, u-blox8-M8_ReceiverDescrProtSpec_(UBX-13003221).pdf 
says on page 87:

    "By default the rover will begin operation in RTK fixed mode. Upon
    receiving an RTCM3 correction stream on any of its communication
    interfaces, the rover will parse the data, apply the correction and,
    if possible, fix ambiguities. In absence of correction data or if
    the correction data times out, the rover will operate in standard
    GNSS mode."

Time to RTFM.

> you put "Trraditionally people
> use u-center to program the u-blox, then save the config"


> Is it possible to save the config on the board itself so when I plug
> it in to my Linux computer it stays configured?

Mostly.  Different u-blox models differ a bit on what can be saved.  You
then have to tell gpsd not to change your config with the -b option.
Then hope you got the options that gpsd needs.

Or, just use ubxtool with gpsd.

> Because one of the
> guys here showed me how he configures it in u-center, but every time
> the u-blox is unplugged from the computer it has to be re-configured.

Working with u-center is not for the faint of heart.  I don't use
Windows, so I can't help there.  Maybe someone else can.

> Or will it have to be done with ubxtool?

Many ways to skin that cat.

u-center on windows.

ubxtool on osX, Linux, or any POSIX host

hex codes with gpsctl

custom python

custom C.

Pick one.  Pick several.  But none work unless and until you learn
how u-blox binary works.  RTFM.

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

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