QUOTE(FLampard @ Jan 30 2011, 11:36 PM)
for first question, i mean "How"..
how does a fighter knows hes being locked? the lock system is based in infra red system release by the heat of the jet right?
uhhhh nvm i use wikipedia liao.
Radar Lock can be detected. how? here how it is; Radar have two mode of operation. scanning mode and tracking mode.how does a fighter knows hes being locked? the lock system is based in infra red system release by the heat of the jet right?
uhhhh nvm i use wikipedia liao.
in scanning mode, the radar seeker head swerve left and right illuminating everything in the fighter's forward arc. in this mode, any objects within the radar arc were illuminated periodically. it's good enough to give you the tactical picture, but not accurate enough to guide a weapon.
Then there's tracking mode. in this mode the radar seeker head point on a specific target. in tracking mode, the radar can only detect and track one target and the radar seeker head will continuously point on the tracked target and follow it wherever it goes until the pilot break the lock (there's Track-While-Scan, but that's beyond most of you and i'm too lazy to explain it).
here's how pilot know they were being locked. before lock-on, the radar warning receiver will detect the radar in pulses as the radar on the enemy fighter scan left and right periodically. Whether the radar wave that's bounce of your fighter was strong enough for the enemy radar to detect, you will never know. that mean's you know there's a radar pointed at your aircraft but you don't know wether it detect you or not. When the enemy radar lock on you, the radar warning receiver will give a long continuous tone like a buzzer. That's because the radar seeker head no longer swerve left and right but instead it pointed at your position and will stay with you wherever you fly.
There's no fully reliable way to detect a Heat seeking missile. recently, the american have developed a Missile approach warning system. it combine a heat sensor and a series of milimetric wave radar systems positioned throughout the airframe. The heat sensor will detect the plume from missile rocket motor and the milimetric wave radar will then track the missile as it approach the target. Not sure how effective the system is.
QUOTE
Currently, there is no technology that can detect IR homing missiles. This is mostly done by visual and if detected early enough, can be defeated by deploying flares, some fancy maneuvers and luck. There are IR jammers technology which basically tries to overwhelm the missile's homing sensors by projecting an intense IR image. Most modern IR homing missiles have been designed to actually adapt and track this image instead. Which basically means that the IR jammer actually helps with tracking the target.
IR jammer originally is a system that transmit a pulses of IR emission. it has something to do with the early IR missile seeker which involve a rotating rectangular mirror. if i were to explain to you how this type of missile seeker work, it'll take several pages of article which i'm to lazy to write and you all too lazy to read. suffice to say that when IR seeker are not centre on target, it'll get pulse IR emission from target and when it center on target it'll get a continous IR emission from the target. IR jammer use the IR pulses to fool the Missile seeker into thinking it's not centre on target yet. But as the IR seeker are moving from traditional "Mirror Base Single Element" into more advance "CCD Base Multi-Elements", the pulse jammer are no longer effective. The laser jammer design to overwhelm the seeker only serve to give the missile extra IR energy for the missile to lock on to.
This post has been edited by Fadly: Jan 31 2011, 09:58 PM
Jan 31 2011, 09:37 PM

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