Improved Smith predictor control for fast steering mirror system

Cao, Zheng; Chen, Jing; Deng, Chao; Mao, Yao; Li, Zhijun

doi:10.1088/1755-1315/69/1/012085

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…After completing the VPDC design, the DOB could be introduced without affecting the stability of the system. According to Figure 6 and Equation (12), the ideal DOB controller Q 2 should be the inverse of G v , as shown below,…”

Section: The Design Of Q 2 and The Ada Improvement With Dobmentioning

confidence: 99%

“…A PID-I method, with an integration added to the controller, was proposed to reduce the steady-state error of the system [11], which, however, would affect the stability of the system and decrease its dynamic performance. In order to eliminate the effect of delay on system stability, a Smith predictor was introduced to the tracking loop [12,13]; however, the delay was moved out from the closed loop but still existed in the system, which would restrict the TP. As reported, a multi-loop control structure based on MEMS inertial sensors could increase the bandwidth of the system [14].…”

Section: Introductionmentioning

confidence: 99%

“…Equation (11) is approximately equal to Equation (6), which means that the FOG-based DOB could not enhance the TP, but slightly affect the stability of the system. Comparing Equation (12) with Equation (7), it could be obviously found that the ADA was continuously improved. Then, at the low frequency 1 − Q 1 e −αs was close to 0 and at the relatively high frequency 1 − Q 2 G v was close to 0, which means that the CCD-based EOB and FOG-based DOB could complement each other and a system with strong ADA in a wide band was acquired.…”

mentioning

confidence: 99%

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Feedforward Control Based on Error and Disturbance Observation for the CCD and Fiber-Optic Gyroscope-Based Mobile Optoelectronic Tracking System

et al. 2018

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In the mobile optoelectronic tracking system (MOTS) based on charge-coupled device (CCD) and fiber-optic gyroscope (FOG), the tracking performance (TP) and anti-disturbance ability (ADA) characterized by boresight error are of equal importance. Generally, the position tracking loop, limited by the image integration time of CCD, would be subject to a non-negligible delay and low-sampling rate, which could not minimize the boresight error. Although the FOG-based velocity loop could enhance the ADA of the system, it is still insufficient in the case of some uncertain disturbances. In this paper, a feedforward control method based on the results of error and disturbance observation was proposed. The error observer (EOB) based on the CCD data and model output essentially combined the low-frequency tracking feedforward and closed-loop disturbance observer (DOB), which could simultaneously enhance the low-frequency TP and ADA. In addition, in view of the poor low-frequency performance of the FOG due to drift and noise that may result in the inaccuracy of the observed low-frequency disturbance, the FOG-based DOB was used to improve the relatively high-frequency ADA. The proposed method could make EOB and DOB complementary and help to obtain a high-precision MOTS, for in practical engineering, we give more attention to the low-frequency TP and full-band ADA. Simulations and experiments demonstrated that the proposed method was valid and had a much better performance than the traditional velocity and position double-loop control (VPDC).

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Section: The Design Of Q 2 and The Ada Improvement With Dobmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Feedforward Control Based on Error and Disturbance Observation for the CCD and Fiber-Optic Gyroscope-Based Mobile Optoelectronic Tracking System

et al. 2018

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“…Although the research on SP started very early, its application in PTS began in just recent years. An improved SP based on a closed-loop model is firstly introduced to the PTS to compensate its small delay with stronger robustness [26]. A technique of modified SP is introduced in the visual servomechanism wherein the output of a mathematical model is replaced by an integration of the gyroscope's signal from the inner loop, which can reduce dependence on the model [27].…”

Section: Introductionmentioning

confidence: 99%

Delay-Compound-Compensation Control for Photoelectric Tracking System Based on Improved Smith Predictor Scheme

Luo

Xue

et al. 2022

IEEE Photonics J.

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High control bandwidth is usually restricted in a photoelectric tracking system (PTS) based on a Charge-Couple Device(CCD) with time delay, which hinders a good tracking performance. Generally, a model-based delay-compensation controller called Smith predictor (SP) can help increase the controller gain to promote the bandwidth by separating delay from the control loop. However, the performance promotion is insufficient because the delay still stays in the forward channel which causes errors between output and input. And the increase of the controller gain is still limited due to the effect of model mismatch on stability. In this paper, to solve the problems, a delay-compound-compensation control (DCCC) based on improved SP by trajectory prediction and velocity feedforward is proposed. The additional trajectory prediction is used to further eliminate the effect of delay existing in the forward channel. The additional velocity feedforward is used to further reform the transfer characteristics limited by the controller gain. A Kalman filter-based design method of trajectory prediction is presented and the optimal design principle of feedback and feedforward controllers is given in the face of model mismatch. Experiments demonstrate that the DCCC is valid and could greatly promote the tracking performance in the low frequency.

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Active Optical Axis Jitter Control by a Magnetostrictive Fast Steering Mirror under Disturbances

Mao

et al. 2019

2019 IEEE 15th International Conference on Control and Automation (ICCA)

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Improved Smith predictor control for fast steering mirror system

Cited by 6 publications

References 19 publications

Feedforward Control Based on Error and Disturbance Observation for the CCD and Fiber-Optic Gyroscope-Based Mobile Optoelectronic Tracking System

Feedforward Control Based on Error and Disturbance Observation for the CCD and Fiber-Optic Gyroscope-Based Mobile Optoelectronic Tracking System

Delay-Compound-Compensation Control for Photoelectric Tracking System Based on Improved Smith Predictor Scheme

Active Optical Axis Jitter Control by a Magnetostrictive Fast Steering Mirror under Disturbances

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