Posts Tagged ‘jamming’
It’s always nice to see an old tech stage a return and this time it’s occurring around the coastlines of Europe, with 9 low-frequency radio transmitters replacementing for GPS’ satellite-based system. eLoran’s radiowave-based system is stronger than satellite signals and less jammable, based upon the Loran system that was formerly used for shipping navigation by both the British and United States navy over 50 years back. But despite its age, the tech has actually shown amazing hardy against undesirable interference. In trials performed by the General Lighthouse Authorities of UK and Ireland, a 1.5 W radio jammer had the ability to knock out GPS indicates over a range of 30 kilometers. Nevertheless, to do the exact same to the Loran system, you ‘d require a 40ft tower– and around 25kW of juice to power it.
The basics behind Loran and GPS are mainly the same, with gadgets measuring the time it takes for a signal to take a trip in between a transmitter and your receiver. Loran needs three songs, with places then calculated through “trilateration”. More signal input consequently equals a more safe and secure position read-out, with the elderly base system providing initial place precision to around 100 meters. Nevertheless, the updated eLoran signal (currently only being broadcast on the eastern coast of the UK, around Dover) will narrow that to the closest 10 meters. The GPS back-up will be slowly rolled out across the whole British shoreline.
The “GNSS Vulnerability 2012: Present Danger, Future Threats” conference will be held today at the National Physical Laboratory in England. There, the results of a recent study will show that the use of GPS jammers in the UK is on the rise — mostly due to drivers who are looking to obfuscate the movement of their vehicles. In a test conducted by the “Sentinel project,” 20 roadside monitors placed near roadsides over the course of six months detected dozens of jammers on vehicles, with one location detecting 60 such incidences.
The concern, now familiar to anybody who has followed the LightSquared saga, is that interfering with GPS can do worse things than allowing a trucker to skip paying toll fees. GPS jamming is cheap and easy, and…
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