nForce
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Keep in mind that all seekers, active EM or passive IR, have scan limits, meaning the seeker cannot see beyond its physical limitations imposed by the nose cone. There is a risk that by the time the missile reached the general vicinity where the target is supposed to be, the target may be outside of the seeker's scan limits.
Assuming the seeker is active EM, there is a manufacturing defect call 'radome aberration'...
All active EM seekers suffers this defect. The issue is manufacturing tolerances where the missile's avionics does not have to deal with this error beyond a certain statistical point. That point is secret, of course.
Passive IR seekers suffers similar manufacturing defects in the glass nose cone.
What kind of material is normally used to make the cone so that this error can be minimized??