Figure eight hysteresis control method and follow-up system

Details Figure eight hysteresis control method and follow-up system Figure eight hysteresis control method and follow-up system

2005-08-23

2005-08-23

Knight, Anthony (Department: 2121)

Data processing: generic control systems or specific application

Generic control system, apparatus or process

Digital positioning

C700S058000, C700S059000, C700S064000, C348S352000, C348S169000, C348S234000, C348S208990, C219S121780, C219S121740

Reexamination Certificate

active

06934591

ABSTRACT:
A control system (102) operates within a dynamic range, and a follow-up system (104) is commanded to reduce a positional error between the follow-up system and the control system when the dynamic range is exceeded. A linear follow-up command may be initially provided once a dead band value (208) is exceeded. The follow-up system (104) is driven relative to its base mount (103) in a direction to reduce the positional error to within a null value range (214). The follow-up command may also implement a decay function to control the follow-up system (104). A control variable transfer function may also be utilized to gradually subtract the dead band value from the follow-up system position error command as a function of time. The decaying function may include linear as well as non-linear decaying functions. In one embodiment, a figure eight-type hysteresis control function may be implemented to control the inertial position of an inertial element. The various embodiments of the present invention may be suitable for space-based laser designating and targeting systems, space-based camera-positioning systems, space-based telescopes, and radar antenna positioning systems.

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