[Dprglist] rtk2go
Karim Virani
pondersome64 at gmail.com
Mon Oct 18 10:04:42 PDT 2021
That's a big topic and it bleeds into everything RTK very quickly. So I'll
try for an almost succinct answer that should provide search terms for
learning more:
RTK gps rovers require a live timing reference from another specialty GPS
receiver with a well-known location known as a base station or mount point.
The base station needs to be somewhat close to the rover's location -
ideally within 10km, but "long baseline" trials indicate you can get good
solutions out to and beyond 50km depending on geography. The data coming
from the base station is usually formatted as RTCM messages but can be
transferred over any link. Often in very remote locations you have to set
up your own base station and you might use a point-to-point radio link to
communicate between rover and base station.
There are also private, commercial and governmental networks of these
correcting base stations. The private ones are usually monetizing their own
and governmental base stations. These tend to be pricey services from the
traditional hobby robotics viewpoint - they are focused on the survey and
agricultural markets. There is a very large free governmental network (
unavco.org) that serves active fault and mountain areas but that's mostly
on the west coast and the rockies. Texas has a free non-real time network
which can help with post-processing to get a good base-station fix, but
doesn't help with RTK. NASA operates another fairly open network, but it
requires getting an account and authorizing - and I didn't want to write
the authentication code for my robot.
If you have internet access on your rover, one of the ways to get RTCM
messages is from an NTRIP server. So many of those commercial and
government networks operate NTRIP servers. The leading implementation of
NTRIP is called SNIP and the company that makes SNIP also supports a
voluntary NTRIP server for people who want to publish their base stations -
known as "mount points" in NTRIP/SNIP land. That network is available at
rtk2go.com It's completely free and requires no authentication to use as a
client.
Anyhow, if you are still reading and still want to learn more, you can also
access my project notes
<https://docs.google.com/document/d/1S-OwHQL25ngPYy-97KP6jZPA6bVr2L2PiUL6ix_6Dts/edit?usp=sharing>.
These notes are for my outdoor rovers and as source material for videos,
blog articles and presentations I might want to do, so they are a bit
jumbled up. There is a GPS RTK primer that starts on page 16.
-Karim
On Sun, Oct 17, 2021 at 6:44 PM Thalanayar Muthukumar via DPRGlist <
dprglist at lists.dprg.org> wrote:
> Hi Karim,
>
> What is a rtk2go network and how does one use it?
>
> Regards.
> - Kumar
>
> On Sun, Oct 17, 2021 at 4:09 PM <dprglist-request at lists.dprg.org> wrote:
>
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>> 1. Re: DPRGlist Digest, Vol 61, Issue 15 (Thalanayar Muthukumar)
>> 2. Re: DPRGlist Digest, Vol 61, Issue 15 (pulcher)
>> 3. Free SSD drive at Micro Center Dallas (Thalanayar Muthukumar)
>> 4. Interesting techniques for 'making & decorating' mechetronics
>> (Carl Ott)
>> 5. Re: RTK corrections source in DFW area? (Karim Virani)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Sat, 16 Oct 2021 16:45:47 -0500
>> From: Thalanayar Muthukumar <tnkumar at gmail.com>
>> To: dprglist-request at lists.dprg.org
>> Cc: dprglist at lists.dprg.org
>> Subject: Re: [Dprglist] DPRGlist Digest, Vol 61, Issue 15
>> Message-ID: <C6BFCA25-36F9-4F55-8CE3-22C187F8F347 at gmail.com>
>> Content-Type: text/plain; charset=us-ascii
>>
>> Micro center Dallas say they are currently sold out
>>
>> Sent from my iPhone
>>
>> > On Oct 16, 2021, at 4:04 PM, dprglist-request at lists.dprg.org wrote:
>> >
>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Sat, 16 Oct 2021 17:24:35 -0500
>> From: pulcher <pulcher at killercomputing.com>
>> To: Thalanayar Muthukumar <tnkumar at gmail.com>,
>> dprglist-request at lists.dprg.org
>> Cc: dprglist at lists.dprg.org
>> Subject: Re: [Dprglist] DPRGlist Digest, Vol 61, Issue 15
>> Message-ID:
>> <mailman.2.1634503868.1684.dprglist-dprg.org at lists.dprg.org>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Wife just picked one up.? 2 minutes ago.HaroldSent from my T-Mobile 4G
>> LTE Device
>> -------- Original message --------From: Thalanayar Muthukumar via
>> DPRGlist <dprglist at lists.dprg.org> Date: 10/16/21 4:45 PM (GMT-06:00)
>> To: dprglist-request at lists.dprg.org Cc: dprglist at lists.dprg.org Subject:
>> Re: [Dprglist] DPRGlist Digest, Vol 61, Issue 15 Micro center Dallas say
>> they are currently sold outSent from my iPhone> On Oct 16, 2021, at 4:04
>> PM, dprglist-request at lists.dprg.org wrote:>
>> _______________________________________________DPRGlist mailing
>> listDPRGlist at lists.dprg.orghttp://
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>> ------------------------------
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>> Message: 3
>> Date: Sat, 16 Oct 2021 19:13:12 -0500
>> From: Thalanayar Muthukumar <tnkumar at gmail.com>
>> To: pulcher <pulcher at killercomputing.com>
>> Cc: dprglist-request at lists.dprg.org, dprglist at lists.dprg.org
>> Subject: [Dprglist] Free SSD drive at Micro Center Dallas
>> Message-ID: <205ADA38-0DFD-4C11-8C29-1DE15791571A at gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> I went to the store just now and picked one up as well. Thanks Harold.
>>
>> Regards.
>> - Kumar
>>
>> Sent from my iPhone
>>
>> > On Oct 16, 2021, at 5:24 PM, pulcher <pulcher at killercomputing.com>
>> wrote:
>> >
>> > ?
>> > Wife just picked one up. 2 minutes ago.
>> >
>> > Harold
>> >
>> >
>> >
>> > Sent from my T-Mobile 4G LTE Device
>> >
>> >
>> > -------- Original message --------
>> > From: Thalanayar Muthukumar via DPRGlist <dprglist at lists.dprg.org>
>> > Date: 10/16/21 4:45 PM (GMT-06:00)
>> > To: dprglist-request at lists.dprg.org
>> > Cc: dprglist at lists.dprg.org
>> > Subject: Re: [Dprglist] DPRGlist Digest, Vol 61, Issue 15
>> >
>> > Micro center Dallas say they are currently sold out
>> >
>> > Sent from my iPhone
>> >
>> > > On Oct 16, 2021, at 4:04 PM, dprglist-request at lists.dprg.org wrote:
>> > >
>> > _______________________________________________
>> > DPRGlist mailing list
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>> ------------------------------
>>
>> Message: 4
>> Date: Sun, 17 Oct 2021 09:48:21 -0500
>> From: Carl Ott <carl.ott.jr at gmail.com>
>> To: DPRG D-List <dprglist at dprg.org>
>> Subject: [Dprglist] Interesting techniques for 'making & decorating'
>> mechetronics
>> Message-ID:
>> <
>> CA+XqQZTVWYVt6B8078wRecqy0JyuD7vEQi2xE9XkQfLd5t5rZQ at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> video starts with the final product
>>
>> Techniques are pretty interesting.
>> Build time-lapse starts circa 2:20...
>> https://youtu.be/rSh0x0GagcQ
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>> ------------------------------
>>
>> Message: 5
>> Date: Sun, 17 Oct 2021 15:03:01 -0500
>> From: Karim Virani <pondersome64 at gmail.com>
>> To: Doug Paradis <paradug at gmail.com>, DPRG <dprglist at lists.dprg.org>
>> Cc: Paul Bouchier <paul.bouchier at gmail.com>
>> Subject: Re: [Dprglist] RTK corrections source in DFW area?
>> Message-ID:
>> <CAKtnkiwq82PVV4riXMP=
>> 5H9zaTnec3-YE5KJz3pH9TDyPZeNtg at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Hey Paul,
>>
>> I've been using the rtk2go network. It's just a voluntary network, so
>> there's no guarantee that the base stations are correct to a known
>> precision, nor is there an uptime guarantee. It's also very sparsely
>> populated in north Texas:
>>
>> [image: image.png]
>>
>>
>> But I've found the VN1 mount point in Richardson to be very stable and
>> accurate for the last year - though it has had some outages.I've been able
>> to use it up to 35km away and still get an error bar that I can't reliably
>> measure.
>>
>> The Arlington mount point also seems stable - it's been there for at least
>> 6 months - but I haven't used it. Others pop up from time to time but
>> haven't lasted long. I've published a base station on rtk2go for short
>> test
>> runs, but have yet to mount my antenna on my roof for a stable offering.
>>
>> Best,
>>
>> Karim
>>
>> On Sun, Oct 17, 2021 at 12:40 PM Doug Paradis <paradug at gmail.com> wrote:
>>
>> > Paul,
>> > The correct address for the mailing list is
>> dprglist at lists.dprg.org.
>> > BTW, Karim has been working with GPS RTK and has used several free
>> > correction data stations in the area.
>> > Regards,
>> > Doug P.
>> >
>> > On Sun, Oct 17, 2021 at 12:35 PM Paul Bouchier <paul.bouchier at gmail.com
>> >
>> > wrote:
>> >
>> >> Hi Doug - long time no see.
>> >>
>> >> I tried to send the email below to the dprg list. You can see I used
>> the
>> >> address dprglist at dprg.org, which is what Carl told me to use. It
>> didn't
>> >> go through. Do I have the address wrong? Anything else you can think
>> of?
>> >>
>> >> Thanks for any ideas you might have
>> >>
>> >> Paul Bouchier
>> >>
>> >> ---------- Forwarded message ---------
>> >> From: Paul Bouchier <paul.bouchier at gmail.com>
>> >> Date: Thu, Oct 14, 2021 at 5:24 PM
>> >> Subject: RTK corrections source in DFW area?
>> >> To: <dprglist at dprg.org>
>> >>
>> >>
>> >> Does anyone know of any free or low-cost stations that provide internet
>> >> access to GPS RTK corrections data for the Dallas/Fort Worth area?
>> >> Apparently TXDOT has NTRIP servers and makes historical data available
>> but
>> >> AFICT doesn't provide live data. Looking for corrections data to feed
>> to an
>> >> RTK receiver so I don't have to set up my own base station.
>> >> Thanks
>> >> Paul
>> >>
>> >
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