DIGITAL BANK-TO-TURN CONTROL AND GUIDANCE (DIGITAL CONTROL, MISSILE DESIGN)

Available from UMI in association with The British Library.; This thesis investigates the application of optimal digital control and estimation techniques to bank-to-turn (BTT), command to line-of-sight (CLOS) guidance.; Initially it is assumed that the missile is ideal and thus responds instantaneously to the demands issued by the guidance law. In addition motion is restricted to a single-plane. Controllers are designed for both stationary and moving sightline engagements and discrete system tuning parameters derived. Subsequently these ideal missile designs are modified to take the actual missile dynamic lags into account and a full three dimensional control strategy proposed. These optimal digital controllers are then compared with those designed using classical frequency domain techniques and discrete pole placement.; A multivariable BTT autopilot is developed which uses rudder action to reduce the level of roll induced cross coupling between the lateral dynamics. The autopilot contains integral action and uses a multivariable notch filter. Optimal multirate digital control theory is used to reduce the autopilot's computational requirements.; The single-plane practical missile designs are repeated using optimal multirate estimation and control techniques to combine slow measurements generated by ground based tracking equipment with more frequent measurements obtained from missile based sensors. The potential benefits arising from the use of this technique are demonstrated.; Classical and modern homing guidance laws are reviewed and then extended to take into account missile dynamic lags. The conditions under which the various homing guidance laws should be used are discussed. Finally the merger of CLOS and homing guidance laws to yield improved coverage boundaries and reduced miss distance is considered.