By Ching-Fang Lin
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Extra info for Modern Navigation, Guidance, And Control Processing
3 Guidance System Classification There are several solutions that can be applied to the problem of guiding a missile to an eventual near miss or collision with a target using only the observed motion of the missile-target line of sight (LOS). In one of these, the missile is constantly flying . - directly toward the current target location. This method, termed simple pursuit, suffers from the fact that the missile must generally undergo rather severe maneuvers as intercept is approached. A second solution concerns a constant-bearing trajectory wherein the missile leads the target, much like the way in which a projectile is traditionally fired at a moving object.
I t is also well suited for use against armor. and high-value and ship targets, and has reasonably good resistance to ECM. However, this all comes at a high relative cost. Like the SAR, the MMW sensor is designed for all-weather operation with the capability of cloud penetration, and is particularly well suited to bad weather conditions. MMW sensors can be used against armor and high-value targets, but are not designed tor use against ship targets. They have a moderate resistance to ECM, and are not unduly expensive to build.
Altitude sensors. Inasmuch as it is a component of the pursuer's flight instrument package, the barometric altimeter provides a convenient targeting sensor. However, by reason of its rather doubtful accuracy, it usually serves as a backup to be used in the event that the slant range sensor ceases to function correctly. Assuming that local barometric pressure is accounted for, the largcst altimetry errors are typically those arising from uncompensated stat~cpressure defect, which is a bias type error that is on the order of a few pcrccnt of the dynamic pressure, and to uncertainty in lapse rate, which is a scale factor typc error that is on the order of a few percent of the pursuer's altitude above mean sea level.