Re: Garmin GPS-18 with prn 42 and 50, no DGPS.
- From: Doug Gray <doug@xxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 26 Oct 2007 07:23:08 GMT
On Thu, 25 Oct 2007 18:24:32 -0700, Jon wrote:
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).
...some snipped
.. 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).
So why has the SBAS solution been abandoned?
Is there a technical reason or is it simply that AsA is so self serving.
I'll bet not one single aircraft leaves the ground that does not have a
GPS of one form or another on the flight deck, and very soon most of these
will be SBAS enabled. Yet AsA has decreed that they're not worthy
of consideration.
It would not be at all difficult to roll out sufficient ground reference
sites networked back to the satellite ground station to up-link correction
data. They could be located at airfields (zero cost to AsA there),
surveyed accurately and equipped with a high resolution GPS and modest
processing power.
Am I oversimplifying this? I think we could ignore tectonic plate
movement so there is no need to over kill.
The rest of the infrastructure is already there thanks of course to the US
and Japanese.
Hmm.. election time - which minister do I need to talk to?
Doug
.
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- Re: Garmin GPS-18 with prn 42 and 50, no DGPS.
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