A device and method for controlling the position and rate of a fast tilting mirror based on a grating ruler

Abstract

The invention discloses a fast tilting mirror position rate control device and method based on a grating ruler, which are mainly used for improving the precision of the tilting mirror control system, reducing tracking errors, and realizing high-precision image stabilization. The control device includes a fast tilting mirror, a servo controller, a grating sensor, an image sensor (such as CCD, four-quadrant, etc.), a beacon light source, and a platform. The control method is a double-loop closed-loop control: the closed-loop loop includes a high-bandwidth speed loop and a tracking loop; the speed loop signal is obtained by differentiating the position signal measured by the grating ruler, and the tracking loop signal comes from the image sensor. The invention adopts a cascaded sensor control mode, effectively reduces the tracking error, realizes high-definition image stabilization, has the advantages of simple structure, stability and reliability, and easy engineering realization.

Description

technical field [0001] The present invention designs the field of tracking control, and specifically relates to a grating ruler-based fast tilting mirror position rate control device and method, which are mainly used to reduce tracking errors, improve system tracking performance, and realize high-definition image stabilization. Background technique [0002] Tilting mirrors are widely used in beam steering systems. It is of great significance to improve the tracking performance of the fast tilting mirror control system. Experts at home and abroad have proposed various methods from hardware and software, and many public documents such as papers (CCD based optical tracking loop design trades, Proc. SPIE, 1635, 286–299 (1992).), (Tip-Tilt Tests by Using Eddy Current Measuring Sensors, Applied Mechanics and Materials, Vol.870, pp.73-78(2017)) have made corresponding reports. The hardware method given in the literature is to improve the design of the system, reduce the delay of ...

AI Technical Summary

Problems solved by technology

However, high control bandwidth is always limited by many aspects, such as delay, mechanical structure, so it is expensive to improve the system design

However, the method of adopting the control mode of the dual-position loop only improves the bandwidth of the inner loop, which is beneficial to the design of the tracking loop controller, but cannot effectively improve the tracking loop's ability to suppress errors.

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