A Composite Control Method for High-Precision Satellite Pointing Tracking by Command Feedforward Compensation
A hybrid control method combining feed-forward compensation with closed-loop feedback based on the target relative motion trajectory is proposed in this paper,which is aiming at significantly improving the satellite dynamic pointing tracking control precision.Firstly,the dynamic error coefficient method is a-dopted to analyze the attitude tracking errors,and power transfer function is established to analyze attitude angular velocity errors caused by sensor noise.Next,a feed-forward compensation control strategy calculat-ing the desired line-of-sight angular velocity and angular acceleration by estimation of the target relative motion is proposed,which resolves the challenge of space-borne detection equipment that can only measure target pointing deviations and doesn't directly perform hybrid control.Finally,the system stability and at-titude tracking performance are validated through mathematical simulations,and ground-based air-bearing experiments are implemented to test the controller's tracking performance.This attitude controller reaches high-precision during dynamic tracking by different input commands without altering the closed-loop feed-back bandwidth.
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