Abstract
In the optical telescope, the stable precision of the optical path is affected by the structural vibrations. The image sensor with time delay and the micro electro-mechanical system (MEMS) accelerometer with massive drift limit the disturbance suppression performance of the closed loops. The current control methods cannot reject sufficiently vibrations due to the deficiency of the sensors, causality, and stability restrictions. In this study, the frequency-domain fusion virtual multi-loop feedback control system with measured disturbance feedforward method is proposed to suppress more structural vibrations. In spite of the deficiency of the sensors, we propose the frequency-domain fusion virtual gyroscopes (VGYR) to measure extra velocity of the system. The VGYR is estimated from the MEMS accelerometer with drift and corrected by the image sensor, and it replaces the fiber-optical gyroscopes (FOG) on the fast-stable platform because the weight of FOG is not negligible. To suppress more vibrations, the VGYR and the replaced FOG are utilized to build the virtual multi-loop feedback control system with measured disturbance feedforward, because it is not limited by the causality and stability restrictions. Therefore, the proposed method with causal ideal compensator can effectively improve stable precision and suppress much more structural vibrations in the wider frequency range. Detailed comparative experimental results adequately illustrate the advantages and effectiveness of this method.
Highlights
The optical telescopes are widely used in the long-distance laser communication system, quantum communication system, and other fields [1,2,3,4]
When the long-distance laser communication system is installed on the movable platforms, such as vehicle, ship, and satellite, the optical path is disturbed by the structural vibrations [5,6]
In order to suppress more vibrations with the deficient sensors, we propose a measured disturbance feedforward (MDF) method based on frequency-domain fusion virtual
Summary
The optical telescopes are widely used in the long-distance laser communication system, quantum communication system, and other fields [1,2,3,4]. W proposed a time-domain fusion method to get rid of the influence of drift [18] This method and the Kalman filter method both brought the time delay of the CCD in the whole bandwidth of the VFC [18,19], which was adverse to the vibration suppression in mid-high frequency range. T introduced the DOB into the position feedback control loop, but it could only improve the disturbance suppression ability at specific low frequencies [25,26]. In order to suppress more vibrations with the deficient sensors, we propose a measured disturbance feedforward (MDF) method based on frequency-domain fusion virtual. MEMS accelerometers, the MFC system cannot avoid the integral saturation caused by the drift the
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