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GNS430 on the Airway



 
 
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  #61  
Old February 14th 06, 03:04 PM posted to rec.aviation.ifr
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Default GNS430 on the Airway

Matt Barrow wrote:
wrote in message news:5I9If.38637$JT.20875@fed1read06...

ted wrote:


Sorry, my intended audience was people who could read english.


I thought we were having a reasonable technical discussion. Instead, you
are another Usenet droid asshole.



That's rich...coming from the original Usenet droid asshole/****house
lawyer.


Well stated by one of the Usenet's finer jerk off inmates.
  #62  
Old February 15th 06, 12:31 AM posted to rec.aviation.ifr
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Default GNS430 on the Airway



Those involved in planning see it differently. That is why the new RNAV
(RNP) criteria presumes a failure of GPS during a terrain-critical phase
of flight.



Is that because of the physics and architecture of the GPS/WAAS system or
is it because the system is still new and not yet proven through enough
testing and actual flight experience?


It's because the known failure rate is considerably higher than with
either VOR or ILS.


Really? Where did you get that data? Show us your source.




A long history of FAA ground-based nav aids has shown very, very little
problem with the ground components of the system. And, where it occurs
there is usually an alternate nav aid or aids available.



It seems you missed the point. The original point was that the chance of
a failure of GPS is not a rationale for preferring ground based navaids
because ground based navaids can fail as well. No one said or implied
that ground based navaids have a high probability of failure.


If I missed the point then you didn't do a very good job of making that
point.


ted wrote:
Sorry, my intended audience was people who could read english.


wrote
I thought we were having a reasonable technical discussion. Instead, you
are another Usenet droid asshole.


Sorry if I hurt your feelings.

If you are truly interested in a technical discussion then why didn't you
answer the question above? where did you get that data?


  #63  
Old February 15th 06, 07:45 AM posted to rec.aviation.ifr
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Default GPS jamming

On Mon, 13 Feb 2006 13:52:03 GMT, "Ted" wrote:


Threat to GPS Fizzled

The Great GPS Scare turned out to be a false alarm.


You don't fly do you? Otherwise you'd have seen large areas where GPS
was deemed unreliable while the tesing was going on in the US.

As far as homing weapons... In your own country? That would go over
really big with the civilians who already aren't happy.




In the run-up to the war, some had expressed concern that Iraqi forces could
employ inexpensive jammers to disrupt the relatively weak signal emitted by
Global Positioning System satellites circling the Earth. Disruption of this
nature would have put a severe kink in USAF's ability to use GPS-guided
weapons and navigate in the desert.

However, the problem proved to be largely unfounded, as coalition forces
used GPS-guided weapons with impunity. DOD data shows that coalition forces
by April 5 had dropped more than 3,000 Joint Direct Attack Munitions, just
one type of GPS-guided weapon.

Early in the conflict, there were reports that Iraq had obtained several GPS
jammers, possibly from a Russian supplier. Maj. Gen. Victor E. Renuart Jr.,
Central Command operations director, announced March 25 that coalition
forces had identified six of these jammers and had destroyed all six.

Roger
  #64  
Old February 15th 06, 07:47 AM posted to rec.aviation.ifr
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Default GPS jamming

Oops, sorry...I hit CTRLN (send) before CTRLI (Insert sig)

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com
  #65  
Old February 15th 06, 02:30 PM posted to rec.aviation.ifr
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Default GPS jamming


"Roger" wrote in message
...
On Mon, 13 Feb 2006 13:52:03 GMT, "Ted" wrote:


Threat to GPS Fizzled

The Great GPS Scare turned out to be a false alarm.


You don't fly do you?
Otherwise you'd have seen large areas where GPS
was deemed unreliable while the tesing was going on in the US.


Did you actually read the article? It was talking about jamming GPS in a
war zone not during testing. If you have a problem with the contents of the
article then I suggest you take it up with the author.



As far as homing weapons... In your own country? That would go over
really big with the civilians who already aren't happy.


Obviously a civilian enforcement action and not military would be
appropriate for civilian interference issues. You don't know much about law
enforcement, do you?





In the run-up to the war, some had expressed concern that Iraqi forces
could
employ inexpensive jammers to disrupt the relatively weak signal emitted
by
Global Positioning System satellites circling the Earth. Disruption of
this
nature would have put a severe kink in USAF's ability to use GPS-guided
weapons and navigate in the desert.

However, the problem proved to be largely unfounded, as coalition forces
used GPS-guided weapons with impunity. DOD data shows that coalition
forces
by April 5 had dropped more than 3,000 Joint Direct Attack Munitions, just
one type of GPS-guided weapon.

Early in the conflict, there were reports that Iraq had obtained several
GPS
jammers, possibly from a Russian supplier. Maj. Gen. Victor E. Renuart
Jr.,
Central Command operations director, announced March 25 that coalition
forces had identified six of these jammers and had destroyed all six.

Roger



  #66  
Old February 16th 06, 04:26 AM posted to rec.aviation.ifr
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Default GPS jamming

Ted wrote:

"Jim Carter" wrote in message
.com...




-----Original Message-----
From: ]
Posted At: Sunday, February 12, 2006 5:53 AM
Posted To: rec.aviation.ifr
Conversation: GNS430 on the Airway
Subject: GNS430 on the Airway

ted wrote:


wrote in message


news:%_hHf.33984$JT.6861@fed1read06...


...clipped for brevity...
[Jim Carter]


Continuity means the reliability of the primary GPS sats themselves.
They can have a sat failure or, more likely, jamming.


[Jim Carter]
Unless control of the satellite management system can be achieved, and
the entire constellation interrupted, wouldn't jamming be a localized
event based on the radiation pattern and power of the jamming
transmitter? And to continue jamming wouldn't the transmitter have to
stay active, making it a pretty easy target for any of several modern
weapons systems that don't rely on GPS for navigation?




http://www.fas.org/man/dod-101/sys/smart/agm-88.htm

http://www.vectorsite.net/twbomb8.html

HARM Block 3a and 5 software updates have completed testing and were
incorporated as a software only engineering change starting in August 1999.
The software improves missile performance against several threat
countermeasures...

The Advanced Anti-Radiation Guided Missile (AARGM) project is adding to the
Block VI capability by demonstrating technology for RF homing integration
with an active millimeter wave terminal seeker to provide a counter-shutdown
capability. Fielding this capability could be in the 2005 timeframe.

http://www.military-aerospace-techno....cfm?DocID=685

http://www.chips.navy.mil/archives/0..._files/GPS.htm

http://www.aeronautics.ru/news/news001/gpsnews001.htm

http://www.afa.org/magazine/May2003/0503road.asp
Threat to GPS Fizzled

The Great GPS Scare turned out to be a false alarm.

In the run-up to the war, some had expressed concern that Iraqi forces could
employ inexpensive jammers to disrupt the relatively weak signal emitted by
Global Positioning System satellites circling the Earth. Disruption of this
nature would have put a severe kink in USAF's ability to use GPS-guided
weapons and navigate in the desert.

However, the problem proved to be largely unfounded, as coalition forces
used GPS-guided weapons with impunity. DOD data shows that coalition forces
by April 5 had dropped more than 3,000 Joint Direct Attack Munitions, just
one type of GPS-guided weapon.

Early in the conflict, there were reports that Iraq had obtained several GPS
jammers, possibly from a Russian supplier. Maj. Gen. Victor E. Renuart Jr.,
Central Command operations director, announced March 25 that coalition
forces had identified six of these jammers and had destroyed all six.




The wink link in Air Traffic control is not GPS but communications. The
FAA still uses AM VHF
transmitters and receivers for AT communications. Very easy to jam and
disrupt. One idiot with one radio could
spread havoc around a major US airport. If the person stays mobile
virtually impossible to locate and detect.
  #67  
Old February 16th 06, 05:59 AM posted to rec.aviation.ifr
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Default GNS430 on the Airway

Ala stuck mic?

-----Original Message-----
From: DILLIGAF ]
Posted At: Wednesday, February 15, 2006 9:26 PM
Posted To: rec.aviation.ifr
Conversation: GNS430 on the Airway
Subject: GPS jamming

Ted wrote:

The wink link in Air Traffic control is not GPS but communications.

The
FAA still uses AM VHF
transmitters and receivers for AT communications. Very easy to jam and
disrupt. One idiot with one radio could
spread havoc around a major US airport. If the person stays mobile
virtually impossible to locate and detect.


 




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