微纳卫星高分辨视频相机光机结构设计与试验(特邀)

Zhang, Lei; Mengqi, Shao; Xue, Zhipeng; Shanshan, Cong; Liu, Jiang; Meijiao, Sun; Zheng, Xiaofeng; Liu, Jinquan

doi:10.3788/irla20210477

红外与激光工程

2021

DOI: 10.3788/irla20210477

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微纳卫星高分辨视频相机光机结构设计与试验(特邀)

Lei Zhang¹,

Shao Mengqi²,

Zhipeng Xue³

et al.

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Angle-Only Target Tracking Method for Optical Imaging Micro-/Nanosatellite Based on APSO-SSUKF

Hua

Yang

et al. 2022

Space Sci Technol

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To ensure the safety of the space station and improve the accuracy of the estimated trajectory tracking of noncooperative target, an optical imaging micro-/nanosatellite based on APSO-SSUKF (adaptive particle swarm optimization-spherical simplex unscented Kalman filter) is proposed to track low-orbit target using angle-only measurement. First, the algorithm considers the effect of J2 perturbation, uses the angle-only data as the observation vector, and uses spherical simplex unscented Kalman filter (SSUKF) to reduce the cost of calculation of the UKF in space noncooperative target tracking. Secondly, it is proposed to use the actual and theoretical covariance of the innovation sequence for real-time estimation of measurement noise, designing the adaptive particle swarm optimization (APSO) algorithm for real-time tracking of the process noise in the SSUKF that improves the accuracy of the filter in angle-only tracking. Finally, the tracking simulation of low-orbit satellite is carried out by using optical imaging micro-/nanosatellite, and the result shows that, compared with UKF, SSUKF, and PSO-SSUKF, APSO-SSUKF reduces the root mean square of the error in predicting the position in space target tracking by 45.44%, 35.26%, and 20.94%, and APSO-SSUKF reduces the root mean square of the error in velocity by 45.58%, 33.53%, and 16.33%, respectively; in the angle-tracking target, APSO-SSUKF improves the convergence and estimated accuracy of the algorithm in tracking.

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Angle-Only Target Tracking Method for Optical Imaging Micro-/Nanosatellite Based on APSO-SSUKF

Hua

Yang

et al. 2022

Space Sci Technol

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新型中小口径反射镜消热刚性支撑结构设计

Yuan Jian,

Zhang Lei

2024

激光与光电子学进展

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A novel rigid support structure is proposed in this paper to solve the contradiction between thermal stability and structural stiffness in smalland mediumaperture space mirrors assembled using traditional flexible supports.Additionally, a highprecision secondary mirror assembly with a clear aperture of ϕ214 mm is developed for a highresolution space camera. The combination of a mirror body, cone, support cylinder, and rigid base plate is adopted to realize heat dissipation by extending and optimizing the transmission path of the thermal stress within the assembly. The secondary mirror assembly with a rigid support structure weighs 2. 6 kg, and the surface accuracy change has a rootmeansquare (RMS) value of 2. 573 nm in the simulation under the condition of a 4 °C uniform temperature rise. The inclination and displacement of the mirror body subjected to the gravity test are 2. 028" and 0. 566 μm, respectively, revealing the outstanding advantages of the proposed scheme over traditional flexible support systems. The measured surface accuracy RMS value of the secondary mirror is 0. 0181λ (λ=632. 8 nm), and the changes in the surface accuracy at 16 and 24 °C do not exceed 0. 0025λ. The fundamental frequency of the assembly reaches 502. 1 Hz, and the surface accuracy of the secondary mirror remains relatively unchanged after rapid heat cycles and largescale vibrations. In the assembling tolerance test, the secondary mirror is only slightly deformed under 0. 02 mm unevenness. The proposed rigid support structure can significantly improve the working performance of smalland mediumaperture mirrors and has broad application prospects in the optomechanical structural design of remote sensors.

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微纳卫星高分辨视频相机光机结构设计与试验(特邀)

Cited by 2 publications

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Angle-Only Target Tracking Method for Optical Imaging Micro-/Nanosatellite Based on APSO-SSUKF

Angle-Only Target Tracking Method for Optical Imaging Micro-/Nanosatellite Based on APSO-SSUKF

新型中小口径反射镜消热刚性支撑结构设计

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