GPS is powered by radio signals from satellites. It was sent by the Navistar, a group of US military satellites. There are at least 24 satellites in operation at all times, and at least four can be seen anywhere on Earth. Each satellite always sends the position and time measured by atomic clocks. The GPS receiver compares it to its own clock and calculates the distance to each satellite. When the GPS receiver locks on to at least four satellites and calculates the time difference, it knows the exact location. Currently, many receivers use GPS as a cheap and accurate mechanism.
It was noon one day in San Diego, California. When the airport manager tried to monitor incoming planes, he noticed that the system was not working properly. Around the same time, at the Naval Medical Center, the pocket bell used for emergency calls to doctors stopped working. Port traffic management systems have also become unavailable. In cities, people trying to use mobile phones have noticed that radio waves are not connecting and banks are unable to withdraw cash from ATMs.The chaos lasted for two hours.
It took three days to find out the cause of the mysterious incident, which took place in January 2007. The reason is Navy training in San Diego Harbor. The navy blocked radio signals and tried to test how to handle a communications blackout. At that time, I inadvertently blocked radio signals from GPS satellites to certain parts of the city.
In fact, GPS satellites are no longer just sending location information to car navigation systems.GPS has become an invisible tool that we rely heavily on without even realizing it. Cell phone companies use GPS time information to connect phones to cell towers. Power companies also use GPS to synchronize multiple grids. Banks and stock exchanges use them as a time stamp to prevent fraud. Society's reliance on GPS is increasing every year. Some worry that they may be relying too much on vulnerable technology. You don't have to do anything special, such as naval training in San Diego, to make things happen.
All you need is a GPS jammer.GPS jammers are plastic devices that are sized to fit on the dashboard of a car. It can be bought online, for example, and used by truckers who don't want their bosses to monitor their movements. It has caused problems at airports and mobile phone signals have been blocked in some cities. Jammers can block GPS for miles. As a result, researchers around the world are doing their best to prevent GPS interference. Even in South Korea, it has been damaged by such disturbing radio waves.
