Advanced technical comparison between Ballistic and Cruise Missile / Ballistic vs Cruise Missile

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Ballistic missiles are rocket-powered only in the initial (boost) phase of flight, after which they follow an arcing trajectory to the target. As gravity pulls the ballistic warhead back to Earth, speeds of several times the speed of sound are reached.
Four different systems help guide a cruise missile to its target:
IGS - Inertial Guidance System- s a standard acceleration-based system that can roughly keep track of where the missile is located based on the accelerations it detects in the missile's motion

Tercom - Terrain Contour Matching -  uses an on-board 3-D database of the terrain the missile will be flying over.

GPS - Global Positioning System - uses the military's network of GPS satellites and an onboard GPS receiver to detect its position with very high accuracy.

DSMAC - Digital Scene Matching Area Correlation- DSMAC system uses a camera and an image correlator to find the target, and is especially useful if the target is moving. 

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