Abstract
In this paper, an approach to improve the disturbance suppression performance of a fast steering mirror (FSM) tracking control system based on a charge-coupled device (CCD) and micro-electro-mechanical system (MEMS) inertial sensors is proposed. The disturbance observation and compensation (DOC) control method is recommended to enhance the classical multi-loop feedback control (MFC) for line-of-sight (LOS) stabilization in the FSM system. MEMS accelerometers and gyroscopes have been used in the FSM system tentatively to implement MFC instead of fiber-optic gyroscopes (FOG) because of its smaller, lighter, cheaper features and gradually improved performance. However, the stabilization performance of FSM is still suffering a large number of mechanical resonances and time delay induced by a low CCD sampling rate, which causes insufficient error attenuation when suffering uncertain disturbances. Thus, in order to make further improvements on the stabilization performance, a cascaded MFC enhanced by DOC method is proposed. The sensitivity of this method shows the significant improvement of the conventional MFC system. Simultaneously, the analysis of stabilization accuracy is also presented. A series of comparative experimental results demonstrate the disturbance suppression performance of the FSM control system based on the MEMS inertial sensors can be effectively improved by the proposed approach.
Highlights
The fast steering mirrors (FSMs) play a critical role in optical fine tracking control systems, such as for adaptive optics, long-distance laser communication, line-of-sight (LOS) stabilization, which are increasingly mounted on vehicles, airplanes, spacecraft and other moving platforms [1,2,3,4]
Considering the installation position of the sensors limited to the narrow spaces of the reverse side of the mirror, both micro-electro-mechanical system (MEMS) accelerometer and gyroscope can be mounted on the frame of FSM due to the relatively small size and low weight [7,8,9,10]
To furtherbecause enhanceofthe we proposed a new FSMdrift noise in stabilization control method, which combines the multi-loop feedback control (MFC) with the disturbance observation and to method
Summary
The fast steering mirrors (FSMs) play a critical role in optical fine tracking control systems, such as for adaptive optics, long-distance laser communication, line-of-sight (LOS) stabilization, which are increasingly mounted on vehicles, airplanes, spacecraft and other moving platforms [1,2,3,4]. MEMS gyroscopes with low noise is generally less than 100 Hz, which limits the bandwidth of the velocity closed-loop and the disturbance suppression ability; the bandwidth of MEMS accelerometers exceeds 800 Hz. the high bandwidth acceleration. Togyroscopes avoid the and saturation of double designed thecontrol controller as and a band-pass filter and was useda CCD to accomplish acceleration control, which the disturbance suppression combined and accelerometers to implement dual improved closed-loop control [14]. The error rejection ability of the FSM system is still not adequate when suffering and the drift noiseBut in MEMS inertial sensors some uncertain disturbances, thestabilization mechanical performance, resonances, CCD time delay and the.
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