[Dprglist] rtk2go

Karim Virani pondersome64 at gmail.com
Tue Oct 19 17:13:35 PDT 2021 

Yup. It's not a light decision to go down the road to high precision GPS.
The required commitment in time is even more than the 10X dollar cost.
Gotta have a compelling requirement.

On Mon, Oct 18, 2021 at 6:06 PM Thalanayar Muthukumar <tnkumar at gmail.com>
wrote:

> uBlox F9P is ~275$. I cannot afford it at this point of time.
>
> Regards.
> - Kumar
>
> On Mon, Oct 18, 2021 at 6:05 PM Thalanayar Muthukumar <tnkumar at gmail.com>
> wrote:
>
>> Thanks @IronReign ... I will check out ublox F9P.
>>
>> Regards.
>> - Kumar
>>
>> On Mon, Oct 18, 2021 at 4:00 PM Iron Reign <ironreignrobotics at gmail.com>
>> wrote:
>>
>>> 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
>>>>>>>> -------------- next part --------------
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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
>>>>>>>> -------------- next part --------------
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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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