Abstract
A feedforward control was proposed based on the decoupling of target movement and disturbance from gyro signals to improve the stabilization precision of line-of-sight (LOS) for an electro-optical tracking system (EOTS) on a moving platform. Signals measured by gyros mounted on gimbal consist of target movement and disturbance. To remove target movement and obtain middle and high frequency disturbance velocity, the gyro signals were filtered by a high pass filter. The disturbance velocity was integrated into the position signal and fed forward to the inner position loop of the fast steering mirror. A detailed analysis was provided to show the proposed approach, to improve disturbance suppression performance with only slight weakening of target tracking ability. The proposed feedforward control was effectively verified through a series of comparative simulations and experiments. Besides, the method was applied in a real ship-based project.
Highlights
Electro-optical tracking systems (EOTSs) are widely used in laser communications, optical imaging, target tracking and so on
An electro-optical tracking system consists of the two axes gimbal and a fast steering mirror (FSM)
This paper focused on the design of disturbance feedforward control to improve disturbance This paper focused on the design of disturbance feedforward control to improve disturbance rejection performance and not affect target tracking ability
Summary
Electro-optical tracking systems (EOTSs) are widely used in laser communications, optical imaging, target tracking and so on. A large number of works have been done to improve the disturbance rejection performance of electro-optical systems. Since both the movements of gimbal and FSM have effects on the orientation of LOS, some researchers focused on gimbal control and others focused on FSM control. Consist of target movement by achieved gimbal coarse tracking and tracking and residue disturbance rejected by gimbal control when the system tracks dynamic target. Residue disturbance rejected by gimbal control when the system tracks dynamic target. Were not suitable for EOTS to achieve high precision of target tracking and and disturbance rejection. Experimental results prove proposed method high bandwidth and precise control object. 4 sets up experiments on an EOTSon to verify thistomethod method and presents theresults
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