System Analysis of Ground-based Inverse Synthetic Aperture Lidar for Geosynchronous Orbit Object Imaging

Xuan, 胡烜 Hu; Dao-jing, 李道京 Li; Han-chu, 付瀚初 Fu; Kai, 魏凯 Wei

doi:10.3788/gzxb20184706.0601003

Cited by 5 publications

(2 citation statements)

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“…Large-scale synthetic aperture optics (SAO) systems are highly important in several applications, such as deep space exploration [ 1 ], high-energy laser physics, national defense security [ 2 ], and other basic research fields [ 3 , 4 ]. The position and pose monitoring of the sub-mirror affects its performance [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

An Ultra-Precision Absolute-Type Multi-Degree-of-Freedom Grating Encoder

Wang

Luo

Zhu

et al. 2022

Sensors

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An absolute-type four-degree-of-freedom (four-DOF) grating encoder that can simultaneously measure the three-axis pose (θx, θy, θz) and one-axis out-of-plane position (Z) of an object with high accuracy is demonstrated for the first time in this research. This grating encoder is composed of a stationary reading head and a movable grating reflector. A light beam from the reading head is projected onto the grating, and three diffracted beams (0th-, +1st-, and −1st-order) are generated, collimated, and received by three separate quadrant photodetectors (QPDs). The information of θx, θy, θz, and Z is coded into spot positions of these three diffracted beams on the QPDs. Thus, the modeling and decoupling algorithms were investigated, and an independent calculation of these four-DOF absolute positions was theoretically guaranteed. A prototype was then designed, constructed, and evaluated. Experimental results verified that the proposed grating encoder could achieve the absolute measurement of four-DOF θx, θy, θz, and Z with an accuracy of sub-arcseconds and sub-micrometers. To the best of our knowledge, the proposed encoder in this research is the first one to achieve absolute simultaneous measurements of four-DOF position and pose with a large measurement range. The success of this new grating encoder can benefit various multi-DOF positioning applications, especially for large-scale synthetic aperture optics (SAO), including stitching off-axis parabolic mirrors and pulse compression grating.

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Section: Introductionmentioning

confidence: 99%

An Ultra-Precision Absolute-Type Multi-Degree-of-Freedom Grating Encoder

Wang

Luo

Zhu

et al. 2022

Sensors

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show abstract

“…Large synthetic aperture optics SAO systems are widely used in deep space telescopes, high-energy lasers, radar, etc. [1][2][3][4] The absolute position and pose of the sub-mirror affect the performance of the SAO system, especially when the position and pose control cannot be conducted manually to zeroing and calibration in real time [5], and the SAO performance will be greatly reduced if the sub-mirrors are far from the ideal posture.…”

Section: Introductionmentioning

confidence: 99%

Modeling and test of an absolute four-degree-of-freedom (DOF) grating encoder

Wang

Zhu

Shi

et al. 2022

Optical Metrology and Inspection for Industrial Applications IX

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For solving the problem of sub-mirror installation and posture monitoring and compensation, an absolute four-degree-of-freedom (DOF) grating encoder that is able to monitor four degrees of freedom's absolute position and pose in the θx, θy, θz, and z-direction is proposed. In this grating encoder, a grating reflector and three quadrant photodetectors (QPD) are employed and an optical path is configured based on the laser autocollimation principle. A model for the solution of the four-DOF motions from outputs of the three QPDs is established. A calibration method for the identification of the relationships between the absolute positions and QPDs outputs is proposed. A prototype four-DOF grating encoder is constructed for verification of this proposal. Test results demonstrated that the method proposed in this research can achieve absolute position distinguishing with a sub-arcsecond and sub-micrometer accuracy in rotation angles and z-direction, respectively.

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Image processing for GEO object with 3D rotation based on ground-based InISAL with orthogonal baselines

2019

Appl. Opt.

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System Analysis of Ground-based Inverse Synthetic Aperture Lidar for Geosynchronous Orbit Object Imaging

Cited by 5 publications

References 0 publications

An Ultra-Precision Absolute-Type Multi-Degree-of-Freedom Grating Encoder

An Ultra-Precision Absolute-Type Multi-Degree-of-Freedom Grating Encoder

Modeling and test of an absolute four-degree-of-freedom (DOF) grating encoder

Image processing for GEO object with 3D rotation based on ground-based InISAL with orthogonal baselines

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