The nail in the coffin: TIS and Mode-S

In a previous article, Roger said:
On Tue, 27 Mar 2007 18:43:48 +0000 (UTC),
(Paul Tomblin) wrote:
"These correction messages are then broadcast through communication
satellites to receivers onboard aircraft using the same frequency as GPS."

The only thing I found was slightly different. "These corrections
messages are then broadcast to receivers onboard the aircraft using
the frequency as the GPS". It said nothing about being broadcast
through communications satellites, or I missed it.

If you were using WAAS, you should get to know the WAAS satellite coverage
areas. I think they fixed the problem, but for a while there the coverage
was **** poor is in New Hampshire and Maine.

IF correction messages can be sent from local areas back to satellites
that would make they very vulnerable to tampering with the data.

At one time the FAA was talking about using ground based broadcast
stations, called LAAS (Local Area Augmentation System). (Which, by the
way, used different frequencies than the GPS constellation.) As far as I
know, none have been deployed yet or they dropped the idea.

--
Paul Tomblin http://blog.xcski.com/
"Of the many tragedies of Vietnam, this raw class discrimination strikes
me as the most damaging to the ideal that all Americans are created equal
and owe equal allegiance to their country." - Colin Powell (pre-sell out)

"Paul Tomblin" wrote in message ...

At one time the FAA was talking about using ground based broadcast
stations, called LAAS (Local Area Augmentation System). (Which, by the
way, used different frequencies than the GPS constellation.) As far as I
know, none have been deployed yet or they dropped the idea.


That reminds me -- I miss hearing from John "WAAS-is-dead" Tarver.
He was almost as amusing as the manic simmers.
Maybe we ignored John too much and he went away.
Our loss, I guess. :-/

Paul Tomblin wrote:
If you were using WAAS, you should get to know the WAAS satellite coverage
areas. I think they fixed the problem, but for a while there the coverage
was **** poor is in New Hampshire and Maine.

I don't know if I'd call it "**** poor", but much of Maine and
ocasionally the rest of New England lose LPV coverage often.
Southern California often loses out, too. Here's a real-time
coverage map:

http://www.nstb.tc.faa.gov/vpl.html

In article ,
(Paul Tomblin) wrote:

At one time the FAA was talking about using ground based broadcast
stations, called LAAS (Local Area Augmentation System). (Which, by the
way, used different frequencies than the GPS constellation.) As far as I
know, none have been deployed yet or they dropped the idea.

I think there were two deployed. The manufacturer was a Canadian company
that was bought out by Honeywell.

At one time the FAA was talking about using ground based broadcast
stations, called LAAS (Local Area Augmentation System). (Which, by the
way, used different frequencies than the GPS constellation.) As far as I
know, none have been deployed yet or they dropped the idea.

I think there were two deployed. The manufacturer was a Canadian company
that was bought out by Honeywell.

http://gps.faa.gov/programs/laas/currentnews-text.htm