Enhanced Disturbance Observer Based on Acceleration Measurement for Fast Steering Mirror Systems

Enhanced Disturbance Observer Based on Acceleration Measurement for Fast Steering Mirror Systems

Blog Article

In this paper, a modified disturbance observer (DOB) for fast steering mirror (FSM) Rimmers optical system based on a charge-coupled device (CCD) and inertial sensors is proposed.Combining a DOB with the classical cascaded multiloop feedback control, including position loop, velocity loop, and acceleration loop, that the disturbance suppression performance of line-of-sight in an FSM system can be significant improved.However, due to the quadratic differential in the FSM acceleration open-loop response, in fact, it is very difficult to realize an integral algorithm to compensate a quadratic differential in practical application.Thus, the conventional DOB controller has to be simplified further to make a concession, which eventuates in still insufficient disturbance compensation, particularly at low frequency.

To solve this problem, an enhanced DOB control structure, which changes the compensation plant to be the acceleration open-loop and avoids the saturation of double integration skillfully, is proposed.The recommended method optimizes the controller design, which is conducive to controller fulfillment in practical systems.A series of comparative experimental results demonstrate that the disturbance silicone-lube suppression performance of the FSM control system can be effectively improved by the proposed approach.