Wide dynamic range CMOS image sensor for star tracking applications

Qian, Xinyuan

doi:10.32657/10356/65456

Cited by 2 publications

(3 citation statements)

References 52 publications

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“…For rotationally symmetric optical systems, the entire FOV can be characterized by a "line field" perpendicular to the optical axis. In this case, the FFL(ω) can be described by the polynomial shown in Equation (9).…”

Section: Expanding Fovmentioning

confidence: 99%

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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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Section: Expanding Fovmentioning

confidence: 99%

“…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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“…Applications such as security surveillance, astronomy, automotive, and scientific imaging demand detectors with single-photon sensitivity to achieve a high signal-to-noise ratio (SNR) in all light conditions and with a high dynamic range (HDR) to cope with large variations of the background [1][2][3][4][5]. For example, in automotive applications, a highly demanding condition occurs when entering a tunnel on a sunny day.…”

Section: Introductionmentioning

confidence: 99%

High Dynamic Range Imaging with TDC-Based CMOS SPAD Arrays

et al. 2019

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This paper investigates the use of image sensors based on complementary metal–oxide–semiconductor (CMOS) single-photon avalanche diodes (SPADs) in high dynamic range (HDR) imaging by combining photon counts and timestamps. The proposed method is validated experimentally with an SPAD detector based on a per-pixel time-to-digital converter (TDC) architecture. The detector, featuring 32 × 32 pixels with 44.64-µm pitch, 19.48% fill factor, and time-resolving capability of ~295-ps, was fabricated in a 150-nm CMOS standard technology. At high photon flux densities, the pixel output is saturated when operating in photon-counting mode, thus limiting the DR of this imager. This limitation can be overcome by exploiting the distribution of photon arrival times in each pixel, which shows an exponential behavior with a decay rate dependent on the photon flux level. By fitting the histogram curve with the exponential decay function, the extracted time constant is used to estimate the photon count. This approach achieves 138.7-dB dynamic range within 30-ms of integration time, and can be further extended by using a timestamping mechanism with a higher resolution.

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Wide dynamic range CMOS image sensor for star tracking applications

Cited by 2 publications

References 52 publications

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

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

High Dynamic Range Imaging with TDC-Based CMOS SPAD Arrays

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