[Dprglist] rtk2go
Thalanayar Muthukumar
tnkumar at gmail.com
Mon Oct 18 12:01:03 PDT 2021
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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>>>> 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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