Can anyone translate this to English. OK, it is English, but you know
what I mean. It is supposed to be some new time service.

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Seeems to be differential GPS?

http://en.wikipedia.org/wiki/Networked_Transport_of_RTCM_via_Internet_Protocol

Cheers,
James Harrison

On 04/04/2013 07:32, gary wrote:

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Isn't this what WAAS does?

On 4/3/2013 11:38 PM, James Harrison wrote:

On 4/3/13 11:32 PM, gary wrote:

Not exactly time service.. this is one of the entry points to do high
performance GPS geodesy. Of course, to know what time it is, you need to
know where you are.

http://igs.org/faqs.html

See also
https://gipsy-oasis.jpl.nasa.gov/

Here's where they put the very precise orbit and clock error estimates
https://gipsy-oasis.jpl.nasa.gov/index.php?page=data

We also have this
http://www.gdgps.net/

On 4/4/13 12:51 AM, gary wrote:

Yes..

There's lots of ways to get real time (or near real time) correction
data. WAAS is but one.  TASS (experimental) is another.  There's various
and sundry local High Accuracy Reference Networks (HARN) around, some
run commercially, some run by governments.  Heck, you used to be able to
subscribe to corrections broadcast on a FM broadcast station subcarrier
like stock quotes and sports scores.  These days, "the internet" is
probably the preferred medium.

Different corrections are in different formats for different end uses.
If you are flying a plane, you only need "meters" kind of accuracy and
you're probably using a L1 only receiver.  If you're doing real time
kinematic surveying, you are looking for 1mm sorts of accuracy, so a
local reference station (or a synthesized reference station) would be
handy for taking out smaller ionospheric and solid earth tides kinds fo
things.

There are also lots of folks distributing corrections and reference
data.  In the US there's commercial providers, so federally funded data
providers have to be careful about "government doesn't compete with
industry" rules.  For instance, to get the JPL precision data, you need
to have an account and certify you're using it for educational and
research purposes, and not as part of a commercial enterprise.  In other
countries, they just put it out there for anyone to use.

It's like mapping data, the availability of which (for free) varies a
lot from country to country.

{Political comment:  I think that mapping and precision geodesy data is
a common good or infrastructure. It's an appropriate use of tax money to
provide universal access because there isn't a "business case" to cover
everything with equal performance. A fine example is USGS topographic
maps and NOAA Marine Charts. }

If you connect to this server....../ Internet / and the second RS232 output from your PC is connected to your  GPS receiver then it shows as DGPS mode..... for the GPS unit.........but not very simple.......

I used it several years ago...... before the WAAS was not fully activated......it improoves the location of your GPS unit......also could not justify if my GPSDO got a better stability......

Rgds Ernie.

.

-----Original Message-----
From: Jim Lux jimlux@earthlink.net
To: time-nuts time-nuts@febo.com
Sent: Thu, Apr 4, 2013 3:50 pm
Subject: Re: [time-nuts] RTS

On 4/3/13 11:32 PM, gary wrote:
Can anyone translate this to English. OK, it is English, but you know
what I mean. It is supposed to be some new time service.

Not exactly time service.. this is one of the entry points to do high
erformance GPS geodesy. Of course, to know what time it is, you need to
now where you are.
http://igs.org/faqs.html

ee also
ttps://gipsy-oasis.jpl.nasa.gov/
Here's where they put the very precise orbit and clock error estimates
ttps://gipsy-oasis.jpl.nasa.gov/index.php?page=data
We also have this
ttp://www.gdgps.net/

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