Re: Garmin GPS-18 with prn 42 and 50, no DGPS.

On Oct 24, 5:54 pm, Doug Gray <d...@xxxxxxxxxxxxxxxxxxxxx> wrote:
On Wed, 24 Oct 2007 19:35:14 +0000, Sam Wormley wrote:
The "reference receiver" is a network of ground stations. The WAAS
differential corrections, based on that reference network, are valid
for a WAAS (SBAS) enabled GPS receivers that is within or spatially
close to the associated reference network.

Agreed, Australia does not have the network of ground stations to compile
the corrections data nor does our aviation administrator or government
have the desire to put this in place. Goodness knows why!

http://astra.aero/faq.aspx very unimpressive! Our problem though.

While it is true that there's no intention of putting SBAS in place,
there is other work going on in the area of GPS augmentation.
Airservices Australia (AsA) has begun deploying GBAS and are also
planning to deploy GRAS (Ground Based Regional Augmentation System).

GRAS is a hybrid, using a ground reference network somewhat similar to
SBAS (though not as dense a network) for the monitoring component and
a datalink similar to GBAS (VHF) for supplying corrections. Once these
are both operational, the improvements to accuracy and integrity that
will be provided will be signifigant.

Of course, this does you no good with the receivers in question, but I
thought it worth pointing out that there are efforts going on to
deploy GPS augmentation systems in the region. AsA is doing some
fairly leading edge work (ADS-B, for example).

I'm not sure what future plans there may be for modes other than
aviation. That would probably depend on things such as if there's a
market for ground users, if that translates into receiver development,
etc.. My guess as to why they are primarily targeting the aviation
mode at this time, is that it currently makes the most sense from a
business perspective (AsA is a semi-privatized organization).

Here's a little blurb on some of what's happening:

<http://www.gnssapproach.com.au/pages/index.asp>


Regards,
Jon

.

Relevant Pages

  • Re: Garmin GPS-18 with prn 42 and 50, no DGPS.
    ... differential corrections, based on that reference network, are valid ... While it is true that there's no intention of putting SBAS in place, ... there is other work going on in the area of GPS augmentation. ... Airservices Australia (AsA) has begun deploying GBAS and are also ...
    (sci.geo.satellite-nav)
  • Re: Garmin GPS-18 with prn 42 and 50, no DGPS.
    ... differential corrections, based on that reference network, are valid ... for a WAAS (SBAS) enabled GPS receivers that is within or spatially ... the corrections data nor does our aviation administrator or government ... the mechanism to deliver the corrections to the individual GPS units ...
    (sci.geo.satellite-nav)
  • Re: Garmin GPS-18 with prn 42 and 50, no DGPS.
    ... GPS-18 we seem to be seeing two WAAS sats in nearly the same location. ... "Differential GPS involves the cooperation of two receivers, ... The "reference receiver" is a network of ground stations. ... differential corrections, based on that reference network, are valid ...
    (sci.geo.satellite-nav)