Tilting mirror vibration suppression method based on improved disturbance observer

Abstract

The invention discloses a tilting mirror vibration suppression method based on an improved disturbance observer. Since mechanical vibrations of an astronomical telescope make the closed-loop performance of a telescope control system decline and these vibrations cannot be well remedied by a classical control structure, the method adopts a tilting mirror to suppress the vibrations. According to themethod, by designing an improved Q filter., a sensitivity function of a tilting mirror control system is optimized, the large-amplitude vibrations are effectively suppressed, and the influence of a water bed effect on the system performance is reduced. Under the case that the system disturbance frequency is known, the control method can achieve optimal correction, and the disturbance suppression capability of the system is effectively improved. According to the method, the system is optimized from a control algorithm, only one image sensor is needed, and the cost is saved. At the same time, the method is clear, the structure is simple, there is no dependence on models, and the method is easy to operate and implement.

Description

technical field [0001] The invention belongs to the field of inertial stability control of a photoelectric tracking platform, and in particular relates to a method for suppressing vibration of a tilted mirror based on an improved disturbance observer, which is mainly used for improving the disturbance suppression capability of a photoelectric tracking system such as a large telescope system. Background technique [0002] Large telescopes promise to see fainter and more distant objects in deep space exploration. However, the observation performance of the telescope may be affected by the vibration caused by vehicles, air conditioners or wind during operation, especially the mechanical structure vibration of the telescope, which cannot be compensated by the classic control loop. For distant objects, a long exposure time can obtain a better signal-to-noise ratio, but the longer the exposure time of the image sensor, the smaller the bandwidth of the control loop. Furthermore, i...

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Problems solved by technology

[0003] Aiming at the problem that the vibration of the mechanical structure of the large telescope affects the system performance, and the closed-loop bandwidth of the image sensor is small under the long integration time, the present invention proposes an improved disturbance observer to improve this problem

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