TARGET DETECTION USING GPS SATELLITE


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INTRODUCTION :

1). Introduction to missile guidance :
Guided missile systems have evolved at a tremendous rate over the past four decades, and recent breakthroughs in technology ensure that smart warheads will have an increasing role in maintaining our military superiority. From a tactical point, our military desires weaponry that is reliable and effective, inflicting maximal damage on valid military targets and ensuring our capacity for lighting fast strikes with pinpoint accuracy. Guided missile systems help fulfill all of these demands.


Concept of missile guidance :

Missile guidance concerns the method by which the missile receives its commands to move along a certain path to reach a target. On some missiles, these commands are generated internally by the missile computer autopilot. On others, the commands are transmitted to the missile by some external
source


Missile guidance using lasers :

Laser guided missiles use a laser of a certain frequency bandwidth to acquire their target. The gunner sights the target using a laser; this is called painting the target. When the missile is launched it uses its onboard instrumentation to look for the heat signature created by the laser on the target. Once the missile locates the heat signature, the target is acquired.


INTRODUCTION TO GPS :
What is meant by GPS ?

GPS, which stands for Global Positioning System, is the only system today able to show us our exact position on the Earth anytime, in any weather, anywhere. GPS
satellites, 24 in all, orbit at 11,000 nautical
miles above the Earth. Ground stations located worldwide continuously monitor them. The satellites transmit signals that can be detected by anyone with a GPS receiver. Using the receiver, you can determine your location with great precision.


Recent development in GPS :
Systematic GPS errors as well as the unavailability of GPS P-code to civilian users led to the development of the differential global positioning system (DGPS). The central idea behind all Differential GPS schemes is that of broadcasting an error signal which tells a GPS receiver what the difference is between the receiver's calculated position and actual position.