Effect of friction and control parameters on the tracking accuracy of a target seeker

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Author
Chan, Joseph K.
Date
1987-12Advisor
Healey, Anthony J.
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Show full item recordAbstract
The tracking accuracy of a missile target seeker depends on many variables. For
a target seeker using a gimbaled platform, an important variable is the friction induced
by the preloaded bearings, and by the short wires which connect the target detector
with the rest of the seeker's electronics. This friction force is nonlinear and sufficiently
large enough such that accurate position tracking of a target, whether stationary or
moving, is difficult. Conventional control methods such as P.D. (proportional plus
derivative) or P.I.D. (proportional plus derivative plus integral) control action can not
satisfactorily meet the error criteria. To overcome the deficiency of these two methods,
a model-reference method has been synthesized, relying on idealized predictor corrector
control to improve the tracking accuracy of the missile seeker. Computer simulations
using the Dynamic Simulation Language have demonstrated the superior performance
expected from this method.
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