A fast steering mirror with ultra-low geometric tilt-to-length coupling noise for space-borne gravitational wave detection

Wu, Yuwei; Hai, Hongwen; Fang, Sijun; Fan, Wentong; Song, Jie; Zhao, Kai; Zhang, Rui; He, Bin; Zhao, Hongchao; Li, Zizheng; Fan, Lei; Yan, Yong

doi:10.1088/1361-6501/ad0317

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…After optimizing the constellation configuration for stability, the TianQin constellation can control the breathing angle variation within a range of ±0.1 • during each three-month observation window [4]. However, the variation in the breathing angle remains significantly larger than the far-field beam width of the telescope (about 5 µrad) [5], leading to a misalignment of the lines of sight for the two spacecraft, and thereby affecting the normal detection of gravitational waves. Therefore, to ensure the detection of gravitational waves, the TianQin mission specifies a pointing stability requirement of 10 nrad/Hz 1/2 in the frequency range of 0.1 mHz to 1 Hz [6] and utilizes the pointing mechanism to actively compensate for the breathing angle variation.…”

Section: Introductionmentioning

confidence: 99%

Research on High-Stability Composite Control Methods for Telescope Pointing Systems under Multiple Disturbances

Zhang,

Zhao,

Fang

et al. 2024

Sensors

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During the operation of space gravitational wave detectors, the constellation configuration formed by three satellites gradually deviates from the ideal 60° angle due to the periodic variations in orbits. To ensure the stability of inter-satellite laser links, active compensation of the breathing angle variation within the constellation plane is achieved by rotating the optical subassembly through the telescope pointing mechanism. This paper proposes a high-performance robust composite control method designed to enhance the robust stability, disturbance rejection, and tracking performance of the telescope pointing system. Specifically, based on the dynamic model of the telescope pointing mechanism and the disturbance noise model, an H∞ controller has been designed to ensure system stability and disturbance rejection capabilities. Meanwhile, employing the method of an H∞ norm optimized disturbance observer (HODOB) enhances the nonlinear friction rejection ability of the telescope pointing system. The simulation results indicate that, compared to the traditional disturbance observer (DOB) design, utilizing the HODOB method can enhance the tracking accuracy and pointing stability of the telescope pointing system by an order of magnitude. Furthermore, the proposed composite control method improves the overall system performance, ensuring that the stability of the telescope pointing system meets the 10 nrad/Hz1/2 @0.1 mHz~1 Hz requirement specified for the TianQin mission.

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Section: Introductionmentioning

confidence: 99%

Research on High-Stability Composite Control Methods for Telescope Pointing Systems under Multiple Disturbances

Zhang,

Zhao,

Fang

et al. 2024

Sensors

Self Cite

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Design of a self-referenced laser scanning and ranging system

Yang,

Shi,

Zhou

et al. 2024

Meas. Sci. Technol.

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The laser scanning and ranging system is a pivotal technology for conducting high-precision multi-dimensional measurements, with diverse applications in remote sensing, satellite formation flying, and surface profilometry. However, the capability to achieve accurate measurement of the current system is limited by the beam-pointing mechanism. Specifically, the rotation angle of the beam-pointing mechanism is too small to achieve zero-position self-calibration, and this mechanism can introduce errors that exceed the precision of distance measurement. Herein, we propose a self-referenced laser scanning and ranging system that can directly determine the measurement origin and avoid motion-induced optical path length errors into the interferometric arms. This system is achieved by placing the reference arm of the measurement system after the beam-pointing mechanism in the optical path. Using a dual-comb ranging system with a precision of ~0.8 μm, we validated the performance of our design through scanning experiments with hollow retroreflectors and surface profile reconstruction of a gauge-block assembly. The experimental results demonstrate that our design achieves accurate measurements without pre-calibration or post-compensation, thereby enhancing its applicability to next-generation space missions.

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Image motion compensation control method for the dynamic scan and stare imaging system

Gao,

Su,

Pan

et al. 2024

Appl. Opt.

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The main function of the dynamic scan and stare imaging system is to quickly and continuously search a large area and perform high-resolution imaging. To eliminate image motion during the scanning process, this paper proposes an image motion compensation control method with dual-channel control. First, an improved model-assisted active disturbance rejection control is proposed, in which an auxiliary model is integrated into the algorithm to improve the control accuracy and response speed of the rotation rate of the platform. Second, a fast steering mirror (FSM) is introduced into the control system to compensate for the scanning speed and multiple disturbances. By adopting the amplitude frequency characteristics of the tracking differentiator, a parallel tracking differentiator filter is designed to suppress the interference of gyroscope noise on the FSM. When the system is disturbed by multiple frequency disturbances, the residual error of the image motion compensation is less than the spatial angular resolution of one pixel through the dual-channel stable control of the platform and the FSM. In the scan imaging experiment results, the average value of the grayscale variance function for the compensated images is close to 90% that of the static reference images.

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A fast steering mirror with ultra-low geometric tilt-to-length coupling noise for space-borne gravitational wave detection

Cited by 3 publications

References 23 publications

Research on High-Stability Composite Control Methods for Telescope Pointing Systems under Multiple Disturbances

Research on High-Stability Composite Control Methods for Telescope Pointing Systems under Multiple Disturbances

Design of a self-referenced laser scanning and ranging system

Image motion compensation control method for the dynamic scan and stare imaging system

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