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This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?
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When the first shots were fired at JFK's motorcade, police couldn't immediately locate the gunman based on sound alone.
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Today, the technology exists for them to it with their smartphones, less than a second after the first shot.
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Here's how.
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Most bullets travel at supersonic speeds, generating a shock wave along their path.
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To track that path, researchers built a small bluetooth sensor for smartphones.
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The sensor uses four mics to measure the shock wave's angle, and its time of arrival.
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Then each phone networks with nearby phones to triangulate the sniper's location, mapping it on the smartphone screen within a second of the gun blast.
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Researchers tested the system with an AK-47, and were able to calculate the shooter's bearings with less than seven degrees of error, and get a decent estimate of his range.
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They presented the method at the Conference on Information Processing in Sensor Networks in Philadelphia.
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Since the system requires at least two phones to work, researchers say it would be ideal for a security force fanned out around a likely target,
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allowing them to respond to threats almost as fast as a speeding bullet.
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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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显示原文 =This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?
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显示原文 =When the first shots were fired at JFK's motorcade, police couldn't immediately locate the gunman based on sound alone.
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3 / 13
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显示原文 =Today, the technology exists for them to it with their smartphones, less than a second after the first shot.
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显示原文 =Here's how.
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显示原文 =Most bullets travel at supersonic speeds, generating a shock wave along their path.
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6 / 13
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显示原文 =To track that path, researchers built a small bluetooth sensor for smartphones.
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7 / 13
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显示原文 =The sensor uses four mics to measure the shock wave's angle, and its time of arrival.
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显示原文 =Then each phone networks with nearby phones to triangulate the sniper's location, mapping it on the smartphone screen within a second of the gun blast.
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显示原文 =Researchers tested the system with an AK-47, and were able to calculate the shooter's bearings with less than seven degrees of error, and get a decent estimate of his range.
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10 / 13
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显示原文 =They presented the method at the Conference on Information Processing in Sensor Networks in Philadelphia.
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11 / 13
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显示原文 =Since the system requires at least two phones to work, researchers say it would be ideal for a security force fanned out around a likely target,
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显示原文 =allowing them to respond to threats almost as fast as a speeding bullet.
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显示原文 =Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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- 单句循环：关
- 单句循环：×3
- 单句循环：×5
- 单句循环：∞