Infra-red Search and Track
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High Quality Content by WIKIPEDIA articles! An infra-red search and track system is a method for detecting and tracking objects which give off infrared radiation such as jet aircraft and helicopters. IRST is a generalized case of Forward looking infrared, i.e. from Forward-Looking to allround situational awareness. Such systems are passive, meaning they do not give out any radiation of their own, unlike radar. This gives them the advantage that they are difficult to detect. However, because the atmosphere attenuates infra-red light to some extent and because adverse weather can attenuate it…mehr

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High Quality Content by WIKIPEDIA articles! An infra-red search and track system is a method for detecting and tracking objects which give off infrared radiation such as jet aircraft and helicopters. IRST is a generalized case of Forward looking infrared, i.e. from Forward-Looking to allround situational awareness. Such systems are passive, meaning they do not give out any radiation of their own, unlike radar. This gives them the advantage that they are difficult to detect. However, because the atmosphere attenuates infra-red light to some extent and because adverse weather can attenuate it also, the range compared to a radar is limited. Angular resolution at short ranges is better than radar due to the shorter wavelength. The first use of an IRST system appears to be the F-101 Voodoo and F-102 Delta Dagger interceptors. These were fairly simple systems consisting of an IR sensor with a horizontally rotating shutter in front of it. The shutter was slaved to a display under the main interception radar display in the cockpit, any IR light falling on the sensor would generate a "pip" on the display, in a fashion similar to the B-scopes used on early radars.