GPS Chaos

Perfectjammer 2022/09/07

　　New Scientist looks at how the proliferation of GPS jammers is creating problems. David Hambling's article called GPS an "invisible tool", which is not only an auxiliary tool for navigation. GPS jammers have become more readily available for purchase on the Internet and are being used more widely than ever before by those wishing to block GPS signals on their vehicles. If the jammer is undisturbed, it can jam GPS signals several kilometers away. The effectiveness of the jammer is partly due to the inherent weakness of the Global Positioning System signal:

　　The problem is that the GPS signal is weak. It's like the headlights of a car 20,000 kilometers away. Because of the limited power supply on the satellite, you can't boost the signal any further.

　　GPS jammers can be bought over the Internet for as little as $30 and, among the users, are truckers that want to block GPS tracking of their vehicles. Jammers are also used to block GPS-based road tolls. In fact, the user of a jammer by a trucker to avoid tolls was responsible for shutting down the GPS-based landing system at nearby Newark International Airport in New Jersey.

Mobile phones are the main users of this intangible utility. When you move, the towers must synchronize with each other to pass the call to other towers - GPS time signals provide a cheap and accurate way to do this. The time offset of each tower is also used to identify it. In fact, many wireless communication technologies use GPS timing for synchronization. This may be the reason for the failure of traffic control and emergency pager in Santiago Port in 2007.

　　It's not just the jammers that are causing problems.GPS spoofing devices are also starting to proliferate. Cheaters are used to manipulating GPS devices to provide false readings.

　　In fact, a truck driver used a jammer to avoid tolls, resulting in the shutdown of the GPS-based It is not only the jammer that causes the problem. GPS spoofing devices also began to proliferate.Cheats are used to manipulating GPS devices to provide false readings.It's like the headlights of a car twenty thousand kilometers away.landing system at the nearby Newark International Airport in New Jersey.The jammer is also used to block GPS-based road tolls.Due to the limited power supply on the satellite, you cannot further enhance the signal.

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