Control structures and properties of missile seekers
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abstract
Airborne (target) seekers are interesting control systems as they have to perform dynamic tracking with low (pointing) error, implicit rate extraction as well as disturbance rejection. After introducing the general concepts, several possible variants of guidance signal extraction configurations are presented and analyzed A special configuration called loop decoupling, where introduction of a tuned minor loop may potentially annul the effect of disturbance, has been formulated and sensitivity of such systems to meaningful perturbations in decoupling loop parameters are investigated Other configurations where improved disturbance rejection is achieved by suitable mixing of outputs are formulated and analyzed in a similar manner. It is shown that in some cases, a systematic trade-off is possible between rejection of disturbance from guidance signal and pointing error by imperfect decoupling. Exact and approximate relations for evolving rational design procedure have been derived. The relations have been illustrated with the help of a numerical example.