Police radar guns might spot suicide bombers
London: Radar guns used by police to spot speeding motorists could help identify would-be suicide bomber in a crowd, say researchers.
A radar gun fires microwave pulses at a car and measures the Doppler shift of the reflected signal to calculate its velocity. However, the strength and polarisation of the reflected signal – the "radar cross section" – can provide additional information about the size and shape of the reflecting object and the material it is made from.
Researchers wondered whether the wiring in a suicide vest would alter the radar cross section of a bomber enough to allow a radar gun to pick him or her out in a crowd, reports New Scientist.
To find out, William Fox of the Naval Postgraduate School in Monterey, California, and John Vesecky of the University of California, Santa Cruz, used software to simulate how radar signals at 1 gigahertz and 10 gigahertz would be reflected by the most common arrangements of looped wiring typically used by suicide bombers. They found that the clearest reflected signals were in the 10 gigahertz range.
Together with colleague Kenneth Laws, they then fired low-power 10 gigahertz radar pulses at groups of volunteers, some wearing vests wired up like suicide vests.
About 85 per cent of the time, telltale factors in the polarisation of the reflected signals allowed them to correctly identify a "bomber" up to 10 metres away.
The team hopes the US army will fund further development of the system, allowing them to boost the detection rate and include refinements to avoid false alarms being triggered by metal in underwired bras, jewellery and earphone leads.
The researchers suggest military checkpoints would be major users of such a system – but it could also be installed alongside CCTV cameras in shopping malls, railway stations, airports and high streets.
The study appears in the Journal of Defense Modeling and Simulation.
More from India
More from World
More from Sports
More from Entertaiment
- President Mukherjee inspect International Fleet Review at Vishakhapatnam
- Divyansh's death not an accident, but a murder?
- Dr Subhash Chandra Show: How realising the purpose of life gives you direction
- Was Divyansh sexually assaulted and then murdered?
- India takes inspiration from Iran; sets up 'Hanger of Kindness' in Delhi
- VIDEO: Mohammad Amir's hat-trick in Match 2 of PSL 2016
- Oh so cute! PM Narendra Modi pulls Akshay Kumar's son Aarav Kumar's ear!-- See pic
- Muslim personal law can't be subjected to scrutiny by Supreme Court: Jamiat-Ulama-i-Hind
- IPL 2016 auction - As it happened...
- Not Delhi, but Varanasi and Muzaffarpur the most polluted cities in India