Optical imaging system for an all-time star sensor based on field of view gated technology

Fang, Liang; Liu, Enhai; Zhang, Hui; Wei, Xinguo; Cheng, Xin; Liao, Zhirong; Zhao, Rujin

doi:10.1364/ao.457987

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…To verify the FOV-gated imaging function, a FOV-gated imaging system working in the short-wave infrared band was designed [ 14 ], as shown in Figure 2 . The working band of this system is 1.3 µm–1.7 µm, the aperture is Φ100 mm, the FOV of the prepositive telescope is 6°, and the total focal length is 1.47 m; the instantaneous gated FOV is 0.4°, the aperture of the microlens element is 3.5 mm, the pixel size of the detector is 20 μm × 20 μm, the corresponding single-pixel FOV is 2.8″, and the pixel number is 640 × 512.…”

Section: Design Requirements Of a Microshutter Array In Fov-gated Ima...mentioning

confidence: 99%

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An Electromagnetic-Driven Microshutter Array in a Field-of-View Gated Image System for All-Time Star Sensors

Fang

Wang

et al. 2023

Micromachines

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Aiming at the application requirements of a field of view (FOV) gated imaging system for all-time star sensors, a key device of a microshutter array with large unit size, high duty cycle, and fast response speed based on the electromagnetic actuation is designed. The proposed microshutter array adopts the principle that the current-carrying coil is subjected to the magnetic force in the magnetic field. The coil element is deflected by the loading current and acts as a light barrier in realizing the optical switch function. The effects of the coil element parameters on the magnetic force torque, torsion beam resistance torque, and switch response time are analyzed, and the structural parameters of the coil element are determined. A sample of the proposed microshutter array based on the electromagnetic actuation with a 4-mm period and a 2.8-mm aperture is fabricated and tested. The test results demonstrate the good switching function of the proposed microshutter array and show that the switch response time of the microshutter element is approximately 2.5 ms. This proposed microshutter array is used to gate an instantaneous small FOV to suppress the sky’s background radiation and make a FOV-gated imaging system realize the multi-stars detection by switching the gated FOV rapidly. This will solve the problem that only one star can be detected within the FOV by a traditional all-time star tracker and promote the all-time star sensor to realize star pattern recognition and autonomous astronomical navigation in the daytime.

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Section: Design Requirements Of a Microshutter Array In Fov-gated Ima...mentioning

confidence: 99%

“…The optical imaging system based on the FOV-gated technology [ 14 ] adopts a large-FOV telescope to collect information on stars and uses microlens and microshutter array to gate the instantaneous FOV rapidly. This can simultaneously ensure a large FOV and a strong sky background light suppression effect.…”

Section: Introductionmentioning

confidence: 99%

An Electromagnetic-Driven Microshutter Array in a Field-of-View Gated Image System for All-Time Star Sensors

Fang

Wang

et al. 2023

Micromachines

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“…A star sensor's primary technical indicators include the update rate, dynamic range, FOV, single-star measurement accuracy, etc [8][9][10]. These indicators are interrelated.…”

Section: Introductionmentioning

confidence: 99%

An Optical System of Star Sensors with Accuracy Performance Varying with the Field of View

Wang,

Chen,

et al. 2023

Sensors

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The field of view and single-star measurement accuracy are crucial metrics for assessing the performance of a star sensor. The field of view determines the spatial range of stars that can be captured by the sensor, while the single-star measurement accuracy determines the precision of attitude determination and control for the star sensor. The optical system of conventional star sensors is constrained by imaging relationships. Once the detector is determined, improving either the field of view or the single-star measurement accuracy will result in the degradation of the other. To address this issue, we propose an optical system for star sensors with accuracy performance varying with the field of view. By controlling the relationship between the field focal length of the optical system and the field of view, it is possible to simultaneously enhance both the field of view and the single-star measurement accuracy. We have designed corresponding optical systems to address the requirements for improving the single-star measurement accuracy and field of view. The design results confirm the feasibility of this star sensor. The star sensors are capable of simultaneously meeting the requirements for star pattern recognition and attitude determination, presenting broad application prospects in fields such as space navigation.

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Parameter Optimization for an All-Time Star Sensor Based on Field of View Gated Technology

Zhong,

Wei,

Jiang

et al. 2024

IEEE Sensors J.

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Optical imaging system for an all-time star sensor based on field of view gated technology

Cited by 5 publications

References 15 publications

An Electromagnetic-Driven Microshutter Array in a Field-of-View Gated Image System for All-Time Star Sensors

An Electromagnetic-Driven Microshutter Array in a Field-of-View Gated Image System for All-Time Star Sensors

An Optical System of Star Sensors with Accuracy Performance Varying with the Field of View

Parameter Optimization for an All-Time Star Sensor Based on Field of View Gated Technology

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