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Subject: How To Defeat GPS Jammers
SYSOP    5/29/2009 5:21:02 AM
 
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forester    Agreed   6/10/2009 10:33:25 AM

The velocity of light in any media is a function of the index of refraction.  The velocity of light in dry air is greater than in damp air, but both are slower the velocity of light in a vaccuum.  The velocity of light is also greater at high altitudes (lower pressure) than at ground level.


And before anyone asks, no there is not a substance where the speed of light is greater than in a vacuum.


In total agreement, that's why I said it's 'nearly' the speed of light.  At any rate, this is a distraction from the point of my response to the other poster: relaying a GPS signal from another aircraft, etc. is not a suitable solution to jamming.  In order to calculate your position you need at least 4 satellite signals to triangulate your position in 3D.  Without those measurements (i.e. your distance to the satellites) you cannot calculate a position.
 
I think another poster hit the nail on the head re: the solution to jamming: kill the jammers. ;)  It's no different than dealing with enemy attempts to jam regular communications as far as I'm concerned.  At the far end of the capability spectrum, anyone sophisticated enough to have enough air cover to avoid having their jammers killed is probably also capable of just simply killing the GPS satellites.
 
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jammerlious       7/17/2012 4:24:23 AM
Cell phone jammer... is an interesting and helpful device when we don’t want to be bothered by the cell phone noise. I just bought myself a cell phone jammer the other day from JAMMERALL ,it is working great and BTW, it’s legal here in my country.
 
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2012jammERall       11/11/2012 9:18:20 PM
Different from other electronics, cell phones have become the necessity of every one's daily life. If someone still has no idea of mobile phones, you must say that "Out!" of course except the senior citizens. To be honest, cell phones really bring us lots of benefits. We use it for talking, sending and playing. With it, our life can be modern one, without it, we will be live in the Mars, you know, know nothing about each other. But do cell phones have no disadvantages? Of course not, more and more people are using cell phones at the cost of other interests. Noises are everywhere, especially the one of mobile phones. What should we do, throw them away? It is a stupid behavior. Have you ever heard cell phone signal booster? It is a new kind of device to solve this problem, effective in blocking the signals of your cell phone and its nearby base station. one side, the mobile phone really benefits us a lot, but another side we also benefit from its noises for a long time, so the fight between the cell phone and cell phone jammer... has been a hot topic in society now. Which side you stand by, jamming or not, it depends on you.
 
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2012jammERall       11/23/2012 4:59:36 AM
Different from other electronics, cell phones have become the necessity of every one's daily life. If someone still has no idea of mobile phones, you must say that "Out!" of course except the senior citizens. To be honest, cell phones really bring us lots of benefits. We use it for talking, sending and playing. With it, our life can be modern one, without it, we will be live in the Mars, you know, know nothing about each other. But do cell phones have no disadvantages? Of course not, more and more people are using cell phones at the cost of other interests. Noises are everywhere, especially the one of mobile phones. What should we do, throw them away? It is a stupid behavior. Have you ever heard cell phone signal booster? It is a new kind of device to solve this problem, effective in blocking the signals of your cell phone and its nearby base station. one side, the mobile phone really benefits us a lot, but another side we also benefit from its noises for a long time, so the fight between the cell phone and cell phone jammer... has been a hot topic in society now. Which side you stand by, jamming or not, it depends on you.
 
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