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GPS / INS
Precision Guidance System
Global Positioning Satellite (GPS)
navigation and guidance is providing effective, low cost means for precision
targeting. This targeting option is used primarily against fixed
or relocateable targets, where the location of the target is
expected to remain fixed for the duration of planning and
execution of the attack. GPS guided weapons are provided with an
integral multi-channel GPS receiver and Inertial Measurement Unit
(IMU) which monitors the weapon's locations and attitude to adjust
its flight path to accurately impact on the target. In low cost
un-powered weapons, the guidance system adjusts the weapon's free
fall to hit a pre-selected point fed into the weapon prior to
takeoff. GPS is also used in guided missiles and cruise missiles,
for mid-course navigation.
GPS weapons are not designed for engagement of moving targets. GPS
guidance provides very efficient means for coordinated attack, as
they are unaffected by weather, target concealment or
countermeasures. Modern weapons are more immune to
GPS jamming, by
the use of advanced GPS-AJ modules. Basic GPS weapons have limited
precision (around 1-10 meter CEP) but can also provide higher
precision by using combined GPS/SAL or GPS/IIR techniques which
also provide aimpoint selection. GPS guided weapons can be
preloaded with target coordinates before the flight, or link with
the aircraft weapon's control systems, over the 1760 armament
control bus, to receive updated target coordinates directly from
on-board or remote targeting systems. Modern SAR and target pods
are already supporting geo-targeting capabilities, and
automatically extract target coordinates from the images they
generate.
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