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Subject: gps air to air missile
rudel    11/22/2005 11:04:48 AM
just wondering if this is even possible
 
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B.Smitty    RE:gps air to air missile   11/22/2005 11:14:23 AM
IIRC, AIM-120D was going to add a GPS option to improve midcourse accuracy. The endgame would still be handled by the active seeker though.
 
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gf0012-aust    gps air to air missile   11/23/2005 6:45:27 AM
there has been an intermittent view that the chinese are looking at GPS as a part of a multiseeker AShM. But you'd still need good top down updating. I would have thought that for an aircraft it's next to useless unless you're trying for a proximity kill - and even then I'd think that there are far more efficient ways to effect a kill. Against a fleet sized ship as part of a collaborative seeker system, then yes, against an aircraft and at the tertiary engagement level? I just can't see it being that useful. There are better ways to kill mobile "speeding" targets.
 
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Texastillidie    RE:gps air to air missile   1/23/2006 6:41:08 PM
In order to use GPS to target a fast moving aircraft, you would first have to have some way to track the target (radar). Then you would need technological means of converting that to real time GPS coordinates. Then some way to transmit those GPS coordinates in real time to the guidance equipment aboard the AAM. Why not bypass all this and hook the guidance directly to the tracking radar? What this would be like is translating morse code into Spanish, then translting the Spanish to English. Why not go from morse code directly to English?
 
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EW3    RE:gps air to air missile GF   1/23/2006 7:08:16 PM
Whose GPS system is China going to use to shot at our airplanes? Ours ;) GPS is pretty much standard issue on most weapons now for mid course correction. in A2A the beauty is that the bad guy doesn't hear any radar from the missile, till it's gets turned on, if done well that would be about at something like 1-2 miles away at a closing speed of 1000+kts. How long does it take to say "Oh Sh!t" in chineses?
 
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USN-MID    RE:gps air to air missile   1/23/2006 7:10:03 PM
It is planned as a fire mode for the AIM-120D. The basic idea is that you can achieve a "stealthy" kill very easily. When you fire a missile, during mid course AMRAAM goes either off semi active homing from the illuminating radadr, or by its own inertial guidance. However, for a stealthy kill, you obviously want the inertial. GPS is more accurate than inertial guidance(although I've heard of some really advanced gyros that are more accurate than the older ones). It can be assumed tho, that you could easily have an AWACS feed GPS updates to the launching fighter, who datalinks to the missile, and presumably can give midcourse updates. Or we can also assume that initially it's fired based on a tracking solution of the target when the missile is fired...if it's based off an AWACS radar solution, the opponent is unlikely to be particularly worried. Also the D is supposed to have a two way link, which supports the previous theories, IMO.
 
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