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Arbiter
Modified 10mW Greenie
Joined: 11 Jan 2006
Posts: 10
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 Posted: 8/13/07, 9:52 AM Post subject: Painting w |
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| In the movies and tv shows, there are often references to painting a target with a laser in order for something like a missile strike to hit it. My question is, how does that work, I can't see how pointing a laser pointer at something makes it any easier to target or find for a missile for instance. |
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BrewDude
Modified 10mW Greenie
Joined: 16 Nov 2005
Posts: 15
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| Posted: 8/14/07, 10:18 PM Post subject: |
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If the weapon of choice is designed with a laser seeking head, it makes perfect sense that the laser will designate that weapon to hit that target.
It also helps in low light conditions when friendlies can 'paint' a target for close air support aircraft to render the enemy dead. |
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cellis4766
4.99mW Green Laser Toy
Joined: 13 Aug 2006
Posts: 9
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| Posted: 8/21/07, 2:34 PM Post subject: |
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I tried to find a better definition, but couldn't find anything...
Basically, the "Painted Target" is now fluorescing a certain frequency of light which the bomb is looking for. The bomb then aims at the light that it sees. |
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shikari_rock
Wicked Lasers Master
Joined: 26 Apr 2007
Posts: 979
Picture(s): 34
Movie(s): 1
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| Posted: 8/22/07, 7:41 AM Post subject: |
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I think it's like this:
You shine the beam.
The aircraft's camera looks for a 532nm dot.
It finds it.
Drop the bombs! |
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fuzion
Fusion Laser
Joined: 17 Nov 2006
Posts: 448
Picture(s): 61
Movie(s): 4
Location: uk, bristol
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| Posted: 8/22/07, 11:05 AM Post subject: |
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Laser guided bomb(LGB) desciption below
The LGB flightpath is divided into three phases: ballistic, transition, and terminal guidance. During the ballistic phase, the weapon continues on the unguided trajectory established by the flightpath of the delivery aircraft at the moment of release. In the ballistic phase, the delivery attitude takes on additional importance, since maneuverability of the UGB is related to the weapon velocity during terminal guidance. Therefore, airspeed lost during the ballistic phase equates to a proportional loss of maneuverability. The transition phase begins at acquisition. During the transition phase, the weapon attempts to align its velocity vector with the line-of-sight vector to the target. During terminal guidance, the UGB attempts to keep its velocity vector aligned with the instantaneous line-of- sight. At the instant alignment occurs, the reflected laser energy centers on the detector and commands the canards to a trail position, which causes the weapon to fly ballistically with gravity biasing towards the target.
Pretty much the bomb is droped and when it hits a certrain hight it triigers the sensor to find the laser path and then guides itself in using the track of the laser beam
The laser unit target designator info
Target designators are semi-active illuminators used to "tag" a target. Typical laser guided bomb receivers use an array of photodiodes to derive target position signals. These signals are translated into control surface movements to direct the weapon to the target. An airborne detector can provide steering information to the pilot, via his gunsight, for example, and lead him on a direct heading to the target, finally giving him an aim point for a conventional weapon. Alternatively, a laser guided "smart" bomb or missile may be launched when a pilot is satisfied that the detector head has achieved lock-on and the launch envelope requirements are satisfied. In either of these cases, the pilot may never see the actual target, only the aim point as indicated by the laser.
Laser designators and seekers use a pulse coding system to ensure that a specific seeker and designator combination work in harmony. By setting the same code in both the designator and the seeker, the seeker will track only the target designated by the designator. The pulse coding is based on Pulse Repetition Frequency (PRF). The designator and seeker pulse codes use a truncated decimal system. This system uses the numerical digits 1 through 8 and the codes are directly correlated to a specific PRF. Dependent upon the laser equipment, either a three digit or a four digit code can be set. Coding allows simultaneous or nearly simultaneous attacks on multiple targets by a single aircraft, or flights of aircraft, dropping laser guided weapons (LGWs) set on different codes. This tactic may be employed when several high priority targets need to be expeditiously attacked and can be designated simultaneously by the supported unit(s).
Fuzion
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Kalapadea
4.99mW Green Laser Toy
Joined: 12 Jan 2006
Posts: 9
Location: Maryland
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| Posted: 8/23/07, 9:00 AM Post subject: |
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Would it be possible... for the sake of jamming/protecting to make a "box" of lasers that run every common combination of codes/sequences?
Like a tower mounted structure with like 200 lasers builtin, running the most common PRFs?
I know the number of combinations is incredible, but is it even a possibility?
I can just imagine some guy out in the desert like "hehe... let's just aim that over _here_ instead... mwahaha"
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rafael
25mW Classic Wicked Laser
Joined: 23 Aug 2007
Posts: 29
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| Posted: 8/23/07, 7:53 PM Post subject: |
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| It would be possible, but the cost of it, is just insane and not worth it, you can spend money much better if you wanted to sabotage the military |
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Kalapadea
4.99mW Green Laser Toy
Joined: 12 Jan 2006
Posts: 9
Location: Maryland
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| Posted: 8/24/07, 12:24 PM Post subject: |
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I didn't mean to sabotage, more like... if this fortification in the desert... wanted to have a defense system, is it possible? 
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berky93
Elite Laser
Joined: 14 Jan 2007
Posts: 229
Picture(s): 3
Location: Highland Park, IL
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| Posted: 10/21/07, 12:32 AM Post subject: |
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I dont think so. maybe it would work once, but as soon as they realize what is happeining theyll change the codes used on their targetting lasers.
also, what if the laser were used to heat up the target to the point it was recognisable with a heat tracking device? youd have to point it at the target or in th e general area of it to make sure it doesnt go after hotter things, but it would definately make the target stand out from surrounding things, even if just a little |
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