[Dprglist] DPRGlist Digest, Vol 63, Issue 1

[Paul Bouchier]

Thanks for the rtk2go info Karim - that's exactly what I was looking for.
And thanks for the link to your awesome document that has details and links
on how to use the F9P - I was looking to use Sparkfun's version of the F9P
board.

Man - you're doing some serious hacking on those REV controllers! 🤓

Paul


> Date: Mon, 18 Oct 2021 12:04:42 -0500
> From: Karim Virani <pondersome64 at gmail.com>
> To: Thalanayar Muthukumar <tnkumar at gmail.com>
> Cc: DPRG <dprglist at lists.dprg.org>
> Subject: Re: [Dprglist] rtk2go
> Message-ID:
>         <
> CAKtnkiwsdXDm91_XtxmwNpVjR+K_j2AMMFgaoMk0fCagXeDdfQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> 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
>
>
>
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