# U.S. Military's GPS Reliance Makes A Cheap, Easy Target

- Author: Joichi Ito
- Date: 2002-10-04T14:08:56Z


前マイケルから聞いていたけど、GPSは簡単にジャミング出来るらしい。かなり軍はGPSに頼っている部分もあって、結構問題になっているみたい。
From David Farber's IP
Wall Street Journal
U.S. Military's GPS Reliance Makes A Cheap, Easy Target

In recent months, the Pentagon has stepped up orders for
precision-guided bombs that use GPS technology. The Pentagon could
use such bombs in an invasion of Iraq to target Iraqi military
installations with pinpoint accuracy. However, these precision-guided
bombs may be vulnerable to GPS jammers. At the Paris Air Show in
1999, a Russian company called Aviaconversia demonstrated a 4-watt
GPS jammer. The jammer weighed about 19 pounds and was capable of
denying GPS reception for more than 100 miles. Many such jammers are
available through the Internet for as little as $39.9. That has
caught the attention of military officials and politicians alike. "We
believe Saddam Hussein has GPS-jamming capability and that he will
use it," said Rep. Joseph Pitts, the co-chairman of the Electronic
Warfare Working Group. The members of this group include 25
congressmen who have been studying GPS vulnerability, among other
issues. "While we do not know the extent of our vulnerability, there
is evidence to suggest that GPS jamming can significantly inhibit
precision targeting," Mr. Pitts added. While jammers can interrupt
the commercial signal, the military signal is configured in such a
way so as to make it difficult to interrupt.  But the problem is that
the military uses the commercial signal to track the military signal.
Some research is on to come up with a technology that allows direct
access of the military signal by aircrafts. Currently, increasing the
signal power is the only solution. Such efforts are under way and the
Air Force is planning three stages of upgraded satellites over the
next 10 to 15 years.





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