First hand experience with GPS Jamming

On Jul 24, 9:43*pm, Eric Greenwell wrote:
On 7/24/2011 8:05 PM, ray conlon wrote: On Jul 24, 10:45 pm, *wrote:

* And the new 4G cellphone- GPS

interference battle is just beginning. The cell phone industry is
promising to deliver billions to the federal coffers, and the FAA cost
the feds $$$, who do you think will win that one?

I'm betting the cell phone people lose this one -

SNIPPED _ CB

At least the problem is not wide spread at the moment. I've never
experienced a GPS problem while flying or driving (except for tunnels
and tall buildings!).


Jamming and spoofing has been a problem for US soaring for years, now.
The sources of jamming and spoofing signals is proliferating, as GPS
uses become
more widespread.

Military testing has spread around the western US from only two sites,
ten years ago,
to multiple sites around popular soaring areas. Fortunately, jam or
spoof activities
from military activities are NOTAMed, which is no consolation if you
are planning an
achievement flight or a contest that happens to be concurrent to
testing.

SSA has helped inform, educate the military and de-conflict military
testing
for some glider events.

In the past two years, we have monitored the Light Squared 4G
frequency
conflict, and participated in public comments on that 'problem', which
is a serious
threat to many aviation users. Their testing offered widespread
potential file
interruption this summer in the West.

Less widely publicized has been WAAS station interference by drivers
with jammers
moving on roadways past approach thresholds at MAJOR hub airports.
Yes, it's
true. Truckers have jammers. They are fortunately, usually localized
in effect,
since they simply want to disable their on-board receivers. But you
don't see that
issue making news media headlines, either.

I have commented to the GNSS-committee members of IGC about these
issues
over the past six years, particularly when some world record altitude
attempts
were imminent using only GNSS-recorders for documentation. (Perlan.)
I was then
poo-poohed for raising issues that "weren't likely to be a problem."
All I asked then
was for consideration of carrying "old" technology for altitude
verification and
continuity, in a location where known jamming was taking place. My
requests
were rebuffed. I still have two 60,000 foot barographs.

Fortunately, the truckers won't influence those potential
achievements. But the solar
flares in the next two or three years might give us other problems.

Steve, I know you have the L/D, but thermal higher !

From the decidely non-technical gal,

Cindy B
SSA Governmental Liaison Committee - Airspace
Region 12 Director

Originally Posted by Steve Leonard[_2_]

Got my first experience with GPS Jamming. Apparently, lots of
truckers on I-35 near the Kansas-Oklahoma border were jamming today.
I would go from 8 satellites showing on my GPS Nav Display (Cambridge
Model 20 GPS) to none, lost distance to turnpoint, lost ground track,
lost bearing to turnpoint in the blink of an eye. Typically, after a
minute or two, the GPS Nav would resume navigation with three
satellites showing. It would in rather short order (10-15 seconds)
get back up to tracking 8 satellites. Repeat process in 2-5 minutes.

I am assuming this was GPS jamming, as nobody else flying from
Sunflower reported any sort of issues, and it only happened in this
one stretch along I-35. Interestingly enough, it happend only once (I
think ) after I crossed to the east side or I-35. Maybe I was just
far enough from the jammers.

My flight is uploaded to OLC. If you download it and watch it in any
playback, you will see me stop, then jump forward. This particular
GPS has worked perfectly before and since. It was only this one brief
section of one leg of the flight. Of course, it really gets your
attention when your display goes all dashes, and the computer says
"GPS Wait".

Anyone else had an "encounter" like this?

Just curious

Steve Leonard
Nimbus 3 VJS

i know it is really cool with a cell phone jammer, you can do what you want to do anytime without noises, i have got one from my friend introduction the website is http://www.jammerall.com. help me a lot, share with you if you need, experience a different life.