I'm calling from my cell...

• Autores: Paul Marks
• Localización: New scientist, ISSN 0262-4079, Nº. 2908, 2013, pág. 19
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Contraband cellphones are a big problem in prisons--now there's a way to see who's making a call. Here, Marks discusses a way on how to pinpoint calls coming from prsions. A team at Intelligent Automation Inc (IAI) of Rockville MD, has now found a way to pinpoint the prison cell that a call is coming from. This has not been done before, says IAI engineer Benjamin Lonske, because the signals in a prison wing are just too messy to analyse. IAI's answer is simple: analyse the phone signals from immediately outside the prison walls instead--where the signals are unaffected by radio echoes. By installing four 5-centimetre antennas at the corners of the building of interest, IAI has managed to locate a phone in use to within 50 centimetres, the team says.