[FOSS-GPS] Amateur NTRIP casters

[John Morris]

The basic requirements for a base station are 1) a good location, 2) reliable power and 3) reliable networking.  I suspect ham relay towers are in excellent locations and they have solved the power issues. They probably don't have great networking bandwidth. You could handle a limited number of connections on a local caster, but the main "hub" caster should have a high bandwidth connection and probably reside somewhere back in town.

My rPI fits into a weatherproof box and is powered over the ethernet cable (POE).  I'm using a Trmble compact dome antenna mounted on a 3/4" pipe. Rather than placing the antenna on a tall, wiggling tower, I'm hammering the pipe deep into the ground. The earth is a much more stable platform for precise positioning.

I'm not sure what voltages are available in the ham towers. The rPi needs a clean 5V.   I'm using a remote POE adapter over a 100m ethernet cable.  If you have 110Vac or 12V nearby, you could use a simple USB charger instead.

John Morris
Menlo Park, CA

________________________________________
From: foss-gps-bounces at lists.osgeo.org <foss-gps-bounces at lists.osgeo.org> on behalf of John Morris <john at coyotebush.net>
Sent: Monday, May 12, 2014 11:17 AM
To: Open Source GPS-related discussion and support
Subject: Re: [FOSS-GPS] Amateur NTRIP casters

I'm setting up a small ntrip caster which runs on a RaspberryPi. It takes data from an Lea-Xt and  can broadcast both raw and RTCM 3.1 messages.  It doesn't support all the variations of Ntrip - just Ntrip 2 over tcp with simple password protection - but that is all I need for my purposes.

Over all, I'd like to set up a series of local, community base stations, and then do a mobile app for short static positions. I haven't started the mobile app yet, but the base station software is close to being usable.

I'd be interested in collaborating.

John Morris

Menlo Park, CA

________________________________________
From: foss-gps-bounces at lists.osgeo.org <foss-gps-bounces at lists.osgeo.org> on behalf of Danny Miller <dannym at austin.rr.com>
Sent: Thursday, May 08, 2014 1:25 PM
To: foss-gps at lists.osgeo.org
Subject: [FOSS-GPS] Amateur NTRIP casters

I have seen some things about NTRIP casters as references.  They're
supposed to be useful, but few and far between.  Long-distance baselines
are likely.

I was talking to a local ham radio group the other day, which was into
setting up stations... repeaters I think, as a grassroots public
service.  I think there was some sort of internet connection involved there.

Would it be useful to use something like LEA-6T or NV08-C L1 stuff as an
amateur, but more likely to be local (low baseline), NTRIP caster?

It really doesn't seem difficult to add this functionality to the sort
of physical stations they do.  Is it useful for accuracy?  Is there an
existing framework by which amateur, local NTRIP data could be located
and accessed?

Danny

_______________________________________________
This message is sent to you from FOSS-GPS at lists.osgeo.org mailing list.
Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your subscription
For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS
_______________________________________________
This message is sent to you from FOSS-GPS at lists.osgeo.org mailing list.
Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your subscription
For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/foss-gps/attachments/20140512/0f1fa8d8/attachment.html>