Robust Risley prism control based on disturbance observer for system line-of-sight stabilization

Rongqi Ma; Rongqi Ma; Rongqi Ma; Qiang Wang; Qiang Wang; Qiang Wang; Jinying Li; Jinying Li; Jinying Li; Jinying Li; Yunxia Xia; Yunxia Xia; Liangzhu Yuan; Liangzhu Yuan; Liangzhu Yuan; Liangzhu Yuan; Jiawei Yuan; Jiawei Yuan; Jianliang Shi; Jianliang Shi; Xiang Liu; Xiang Liu; Qiong Tu; Qiong Tu; Qiong Tu; Qiong Tu; Tao Tang; Tao Tang; Yao Mao; Yao Mao; Yongmei Huang; Yongmei Huang; Yongmei Huang; Yongmei Huang; Ge Ren; Ge Ren

doi:10.1364/AO.454312

Applied Optics
Vol. 61,
Issue 12,
pp. 3463-3472
(2022)
•https://doi.org/10.1364/AO.454312

Robust Risley prism control based on disturbance observer for system line-of-sight stabilization

Rongqi Ma, Qiang Wang, Jinying Li, Yunxia Xia, Liangzhu Yuan, Jiawei Yuan, Jianliang Shi, Xiang Liu, Qiong Tu, Tao Tang, Yao Mao, Yongmei Huang, and Ge Ren

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Rongqi Ma, Qiang Wang, Jinying Li, Yunxia Xia, Liangzhu Yuan, Jiawei Yuan, Jianliang Shi, Xiang Liu, Qiong Tu, Tao Tang, Yao Mao, Yongmei Huang, and Ge Ren, "Robust Risley prism control based on disturbance observer for system line-of-sight stabilization," Appl. Opt. 61, 3463-3472 (2022)

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Abstract

In this paper, a robust control based on disturbance observer is proposed to improve the tracking accuracy of the Risley prism system (RPS). Applying the flexible thin-wall ring mechanism in the RPS causes a series of tracking and pointing challenges. Disturbances such as friction, shaft deformation, and model perturbation significantly deteriorate the tracking and pointing accuracy of the RPS. Two different observer-based control methods are proposed to guarantee the tracking precision of the RPS. Moreover, the disturbance observation and compensation (DOC) performance of the proposed methods is analyzed and compared. Finally, simulation and experiment results indicate that the proposed control methods, especially the DOC-expanded state observer control mode, obtain the best performance for disturbance rejection in the RPS.

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Data availability

Data underlying the results presented in this paper are not publicly available due to the privacy regulations at this time but may be obtained from the corresponding authors upon reasonable request.

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	DLC	DLC-DDOC	DLC-DOC-ESO
0.1 Hz	$- 84 d B$	$- 137 d B$	$- 174 d B$
1.0 Hz	$- 38 d B$	$- 70 d B$	$- 87 d B$
10 Hz	$- 12.5 d B$	$- 14.3 d B$	$- 12.5 d B$

LOS Error (arc sec)	DLC	DLC-DDOC	DLC-DOC-ESO
RMS	${11.67}^{''}$	${2.25}^{''}$	${1.72}^{''}$
MVPV	${84.32}^{''}$	${11.12}^{''}$	${4.50}^{''}$
RMS of improved rate	1	5.19	6.79
MVPV of improved rate^a	1	7.58	18.74

LOS Error (arc sec)	DLC	DLC-DDOC	DLC-DOC-ESO
RMS	${18.05}^{''}$	${6.97}^{''}$	${6.34}^{''}$
MVPV	${111.29}^{''}$	${17.91}^{''}$	${6.98}^{''}$
RMS of improved rate^a	1	2.59	2.85
MVPV of improved rate	1	6.21	15.94

	DLC	DLC-DDOC	DLC-DOC-ESO
0.1 Hz	$- 84 d B$	$- 137 d B$	$- 174 d B$
1.0 Hz	$- 38 d B$	$- 70 d B$	$- 87 d B$
10 Hz	$- 12.5 d B$	$- 14.3 d B$	$- 12.5 d B$

LOS Error (arc sec)	DLC	DLC-DDOC	DLC-DOC-ESO
RMS	${11.67}^{''}$	${2.25}^{''}$	${1.72}^{''}$
MVPV	${84.32}^{''}$	${11.12}^{''}$	${4.50}^{''}$
RMS of improved rate	1	5.19	6.79
MVPV of improved rate^a	1	7.58	18.74

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Applied Optics