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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 |
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