Aps-based miniature sun sensor for earth observation nanosatellites

Buonocore, M.; Grassi, Michele; Rufino, Giancarlo

doi:10.1016/j.actaastro.2004.09.006

Cited by 30 publications

(22 citation statements)

References 7 publications

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“…The prototype of the miniature sun sensor under development [11] has been tested in the presented laboratory facility. The sensor is based on a radiationhardened Active Pixel Sensor (APS) detector (STAR250 TM by FillFactory), which has an array of 512 x 512 25-m sensing pixels, and a slim opaque mask with a tiny hole (0.1-m radius) covering the detector and limiting its illumination.…”

Section: Sun Sensor Modelmentioning

confidence: 99%

“…Such a mask determines an array of spots on the focal plane, so that multiple sun-line measures can be produced, at the cost of increased image processing, and an improved estimate can be produced by averaging. The attainable performance has been preliminarily estimated by means of software simulations of sensor operation [11], which accounted for real sun illumination characteristics and noise characteristics peculiar of the STAR250 TM detector. The resulting theoretical accuracy is in the order of 0.005°.…”

Section: Sun Sensor Modelmentioning

confidence: 99%

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Laboratory test of an APS-based sun sensor prototype

Rufino¹,

Perrotta²,

Grassi³

2017

International Conference on Space Optics — ICSO 2004

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This paper deals with design and prototype development of an Active Pixel Sensor -based miniature sun sensor and a laboratory facility for its indoor test and calibration. The miniature sun sensor is described and the laboratory test facility is presented in detail. The major focus of the paper is on tests and calibration of the sensor. Two different calibration functions have been adopted. They are based, respectively, on a geometrical model, which has required least-squares optimisation of system physical parameters estimates, and on neural networks. Calibration results are presented for the above solutions, showing that accuracy in the order of 0.01° has been achieved. Neural calibration functions have attained better performance thanks to their intrinsic auto-adaptive structure.

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Section: Sun Sensor Modelmentioning

confidence: 99%

Section: Sun Sensor Modelmentioning

confidence: 99%

Laboratory test of an APS-based sun sensor prototype

Rufino¹,

Perrotta²,

Grassi³

2017

International Conference on Space Optics — ICSO 2004

Self Cite

View full text Add to dashboard Cite

show abstract

“…Remark 1: From (12), it is clear that when there are more sensor pixels on the HSS, i.e. when N is larger, the deviation between the estimator s and the true sun vector s is a random variable with smaller variance.…”

Section: Estimation Of Sun Vectormentioning

confidence: 99%

“…Sunlight is allowed to pass through the pinholes and create a pattern of light and dark spots on the sensor. Since the focal distance and pattern of pinholes in the mask is known, the distribution of light and dark spots can be analysed to determine the sun angles [12]- [15].…”

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confidence: 99%

A Hemispherical Sun Sensor for Orientation and Geolocation

2014

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We propose a novel sensing system with a hemispherical arrangement of light intensity sensors to determine the vector to the dominant light source in its environment. We apply this system to the measurement of sun vector. The accuracy of our sensor is proved to be scalable when using more sensing pixels. Our experimental data yields the solar azimuth to within 5°and the solar zenith to within 1°using only five light intensity sensors. A sensor operation procedure is provided to improve sensor accuracy. A method is shown that determines absolute orientation and location from the measured sun vector. The corresponding uncertainty analysis is also presented.

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“…Its general applications include measuring the azimuth of sunlight to acquire the attitude of the spacecraft [1][2][3][4][5], measuring the incident parallel light to get various angle values [6][7][8] in precision measurement, measuring the incident angle of parallel light precisely, robots, solar-energy equipment in automatic control technology to help, and other automatic apparatus to can trace the transformation of the azimuth of the control beam or the energy beam automatically [9]. Currently, there are many different ways to measure the incident angle of parallel light [1][2][3][4][5][6][7][8][9]. However, due to the limitation of the measurement principle, it is usually hard to satisfy the requirements of measurement performance on both high precision and large measurement range.…”

Section: Introductionmentioning

confidence: 99%

Incident angle of parallel light measurements based on optical vernier principle

Chen

Hong

2008

Front. Optoelectron. China

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The incident angle of a parallel light beam is hard to measure accurately under the requirement of both high precision and large measurement range. A solution based on the optical vernier principle is presented, and a corresponding measuring device is given. Compared with the former method, the suggested apparatus realizes high accuracy in a larger measurement range. The experiments on the designed apparatus show a high precision of better than 0.02u in a measurement range of ¡64u and the experimental results are in accordance with analytical results in theory. The invented apparatus can be widely used in many technical areas such as aerospace, precision measurement and automatic control.

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Aps-based miniature sun sensor for earth observation nanosatellites

Cited by 30 publications

References 7 publications

Laboratory test of an APS-based sun sensor prototype

Laboratory test of an APS-based sun sensor prototype

A Hemispherical Sun Sensor for Orientation and Geolocation

Incident angle of parallel light measurements based on optical vernier principle

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