[Dprglist] rtk2go

Iron Reign ironreignrobotics at gmail.com
Mon Oct 18 13:59:57 PDT 2021 

Kumar,

Looks like that receiver supports multiple constellations, which is nice,
but I'm pretty sure it won't have any RTK features, so you're looking at
your normal 2-3 meter accuracy range. RTK receivers are significantly more
expensive and you'll also need to invest in a matching antenna. There's a
section of my notes the ublox F9P which is the module I'm using.

On Mon, Oct 18, 2021 at 3:19 PM Thalanayar Muthukumar via DPRGlist <
dprglist at lists.dprg.org> wrote:

> I am considering adding (https://www.adafruit.com/product/4415) to my
> rover.
>
> Regards.
> - Kumar
>
> On Mon, Oct 18, 2021 at 1:57 PM Thalanayar Muthukumar <tnkumar at gmail.com>
> wrote:
>
>> Thanks Karim for the fairly detailed succinct :-) answer. Really
>> appreciate it.
>> I have downloaded your notes, but have yet to read it.
>>
>> As a person who plans to take my rover outdoors,and I plan to have
>> internet access on my rover, it seems I should
>> connect to a NTRIP server at rtk2go.com (I live in Allen, TX) and by
>> doing so, I can get higher accuracy.
>>
>> Your email was very helpful, Karim. Thanks.
>>
>> Regards.
>> - Kumar
>>
>> On Mon, Oct 18, 2021 at 12:04 PM Karim Virani <pondersome64 at gmail.com>
>> wrote:
>>
>>> 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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>>>>> Today's Topics:
>>>>>
>>>>>    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://
>>>>> lists.dprg.org/listinfo.cgi/dprglist-dprg.org
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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
>>>>> > DPRGlist at lists.dprg.org
>>>>> > http://lists.dprg.org/listinfo.cgi/dprglist-dprg.org
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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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