An improved feedforward controller design method

QiuNong He; Yao Mao; Xi Zhou; Zhijun Li; Chao Zhang

doi:10.1117/12.2506253

18 January 2019 An improved feedforward controller design method

QiuNong He, Yao Mao, Xi Zhou, Zhijun Li, Chao Zhang

Proceedings Volume 10839, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test, Measurement Technology, and Equipment; 1083917 (2019) https://doi.org/10.1117/12.2506253
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

Abstract

In this paper, there is a control system which has a strict requirement on the system load and a limited installation space for the sensors. According to the conditions of this system, the scheme by only installing a group of angular position sensors on this system is proposed. Nevertheless, the tracking performance of the system is limited by the time delay of the CCD, the traditional feedback control methods cannot meet the requirements of the system tracking accuracy. The feedforward method can theoretically improve the tracking performance without affecting the dynamic performance of the system. Unfortunately, the feedforward control method requires accurate target state information, and the CCD can only detect the light-of-sight error of the target. Therefore, we propose recovering the target trajectory by combining LOS errors from the CCD and the platform angular position from the angular position sensors, and adding a position feedforward to the system based on a dual-closed loop of angular position sensors and CCD. In addition, there is bad noise in the target state information obtained by the fusion. Then, a Kalman filter is used in this paper to filter and estimate the target state information. Essentially, the Kalman filter is the feedforward controller of the system. In order to design a better feedforward controller, a frequency-domain analysis method for the time-domain filters is proposed. The methods proposed in this paper are verified trough simulations and experiments.

Citation Download Citation

QiuNong He, Yao Mao, Xi Zhou, Zhijun Li, and Chao Zhang "An improved feedforward controller design method", Proc. SPIE 10839, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test, Measurement Technology, and Equipment, 1083917 (18 January 2019); https://doi.org/10.1117/12.2506253

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KEYWORDS

Control systems

Filtering (signal processing)

Charge-coupled devices

Position sensors

Electronic filtering

Device simulation

Target detection

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