[FOSS-GPS] Amateur NTRIP casters

[Danny Miller]

Plenty of very cheap buck converters to get 5V from higher voltage DC 
sources.  I don't think power is a problem.

What is this composed of?  Does RTKLib allow you to output data as an 
NTRIP caster?

Is there any kind of database your GPS could look up against its 
location and select it?  Or would you just need to know the IP# as an 
ad-hoc lookup?

Danny

On 5/12/2014 5:22 PM, John Morris wrote:
> 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
>
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