Micro APS based star tracker

Liebe, Carl Christian; Alkalai, Leon; Domingo, George; Hancock, B.; Hunter, Don; Mellstrom, J.; Ruiz, Ioseba Joaquin Tena; Sepúlveda, César; Pain, Bedabrata

doi:10.1109/aero.2002.1035396

Cited by 42 publications

(29 citation statements)

References 9 publications

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“…The initial value of six general orbital elements: 7136.35km a = , Three star sensors are fixed and the FOV [6] is 20 20 × . Using the interface module of STK to connect with VC [7] .…”

Section: A Simulation Conditionsmentioning

confidence: 99%

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The star sensor layout based on geometric position analysis

Zhao

Hao

2012

2012 IEEE International Conference on Automation and Logistics

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Aiming at solving the problem that the measurement accuracy and veracity of the star sensor is seriously affected by stray light for a geocentric pointing three-axis stabilized satellite, this paper analyzed how the sunlight and the moonlight impacted on the star sensor during the satellite onorbit running. This method is proposed on basic of studying geometric position of Sun, Earth, Moon and the satellite, considering several elements including the satellite attitude, the star-sensor installation location and field of vision(FOV). Moreover, according to the layout of star-sensor, recommended plans at different time are discussed and given, which can avoid bad influences of stray light effectively.

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“…The initial value of six general orbital elements: 7136.35km a = , Three star sensors are fixed and the FOV [6] is 20 20 × . Using the interface module of STK to connect with VC [7] .…”

Section: A Simulation Conditionsmentioning

confidence: 99%

“…Star sensor determines the three-axis attitude of the satellite by measuring the stellar radiation. But the stellar luminosity is weak light and illumination of the apparent magnitude is only 6 2.1 10 lx − × . The interference of stray light [1] (the sunlight, the moon reflected light, earth and atmosphere radiation, etc.)…”

Section: Introductionmentioning

confidence: 99%

The star sensor layout based on geometric position analysis

Zhao

Hao

2012

2012 IEEE International Conference on Automation and Logistics

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“…It can achieve an angular accuracy in the range of arcseconds [1] and currently is the most accurate among all existing attitude sensors. Fig.…”

Section: Introductionmentioning

confidence: 99%

A dual-exposure in-pixel charge subtraction CTIA CMOS image sensor for centroid measurement in star trackers

Qian

Guo

et al. 2014

2014 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)

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In this work, we present a CMOS image sensor for star centroid measurement in star trackers. The analysis of the star tracker system shows that long integration will cause "tail effect" in the star image. It significantly reduces the signal magnitude, which in turn increases the centroiding errors. In order to capture limited photons generated from dim stars within shortened integration time, we propose a new capacitive transimpedance amplifier (CTIA) pixel architecture with a small integration capacitor. On the other hand, bright stars can easily saturate the pixels, which can also induce significant measurement errors. To avoid pixel saturation, the pixel is able to perform in-pixel charge subtraction based on photocurrent thresholding. In order to validate the pixel design, we have fabricated a test chip consisting of a 4×4 pixel array using Global Foundry 65 nm mixed signal CMOS process.

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“…Equation (1) shows that the accuracy of the incident angle is proportional to the accuracy of the sun spot centroid calculation. Thus, the sensor chip of the APS+, which is capable of accurately determining the sun spot's centroid, is a critical component of the sun sensor system.…”

Section: Working Principle Of the µDssmentioning

confidence: 99%

“…They are classified into different categories according to the reference vectors they use, e.g., gyrocompasses, magnetometers, star trackers, and sun sensors. 1 Among these attitude sensors, sun sensors are characterized by their simple structure, low cost, and low power consumption. These characteristics make sun sensors attractive for microsatellite applications.…”

Section: Introductionmentioning

confidence: 99%

Low-power high-accuracy micro-digital sun sensor by means of a CMOS image sensor

Xie

Theuwissen²

2013

J. Electron. Imaging

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Abstract. A micro-digital sun sensor (μDSS) is a sun detector which senses a satellite's instant attitude angle with respect to the sun. The core of this sensor is a system-on-chip imaging chip which is referred to as APS+. The APS+ integrates a CMOS active pixel sensor (APS) array of 368 × 368 pixels, a 12-bit analog-to-digital converter, and digital signal processing circuits. The μDSS is designed particularly for microsatellite applications, thus low power consumption is the major design consideration. The APS+ reduces power consumption mainly with profiling and windowing methods which are facilitated by the specific active-pixel design. A prototype of the APS+ which is designed in a standard 0.18-μm CMOS process is presented. The APS+ consumes 21 mW at 10 fps, which is 10 times less than the state of the art. In order to improve noise performance, a reset noise reduction method, quadruple sampling (QS), is implemented. QS reduces the effect of the reset noise compared to the conventional delta double sampling method, even in a 3-transistor active pixel structure. The APS+ obtains an accuracy of 0.01 deg with the QS method. © 2013 SPIE and IS&T

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Micro APS based star tracker

Cited by 42 publications

References 9 publications

The star sensor layout based on geometric position analysis

The star sensor layout based on geometric position analysis

A dual-exposure in-pixel charge subtraction CTIA CMOS image sensor for centroid measurement in star trackers

Low-power high-accuracy micro-digital sun sensor by means of a CMOS image sensor

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