Results 11 to 20 of about 560,529 (289)
Autonomous Recalibration of Star Trackers [PDF]
IEEE Sensors Journal, 2018 <p>Star trackers must be calibrated prior to flight so that they can make accurate measurements of star positions within the instrument field of view. This calibration is usually performed in atmosphere and after the sensor is launched; it is not uncommon to observe a small shift in some of the calibration parameters.
John Enright, Brendon Vaz
exaly +3 more sources
Star trackers for attitude determination [PDF]
IEEE Aerospace and Electronic Systems Magazine, 1995 One problem comes to all spacecrafts using vector information. That is the problem of determining the attitude. This paper describes how the area of attitude determination instruments has evolved from simple pointing devices into the latest technology, which determines the attitude by utilizing a CCD camera and a powerful microcomputer. The instruments
C C Liebe
exaly +5 more sources
Sensors, 2022 A catalogue of over 22,000 objects in Earth’s orbit is currently maintained, and that number is expected to double within the next decade. Novel data collection regimes are needed to scale our ability to detect, track, classify and characterize resident ...
Siddharth Dave +2 more
doaj +1 more source
A Staring Tracking Measurement Method of Resident Space Objects Based on the Star Tacker
Photonics, 2023 Measuring resident space objects (RSOs) by star trackers has become a research hotspot in space situational awareness. However, the arc length measured by star trackers is too short to complete the high-precision orbit determination of the RSO.
Tingting Xu +4 more
doaj +1 more source
The forward GEM tracker of STAR at RHIC [PDF]
2008 IEEE Nuclear Science Symposium Conference Record, 2008 3 pages, 4 figures, submitted to the Conference Record of the IEEE NSS 2008, Dresden ...
Simon, F. +13 more
openaire +3 more sources
An Evaluation of Low-Cost Vision Processors for Efficient Star Identification
Sensors, 2020 Star trackers are navigation sensors that are used for attitude determination of a satellite relative to certain stars. A star tracker is required to be accurate and also consume as little power as possible in order to be used in small satellites.
Surabhi Agarwal +5 more
doaj +1 more source
Star Identification and Attitude Determination With Projective Cameras
IEEE Access, 2021 Images of starfields collected by a projective camera are useful for a variety of scientific and engineering purposes. This utility is exemplified by star trackers, which are amongst the most commonly used sensors for determining the attitude of modern ...
John A. Christian, John L. Crassidis
doaj +1 more source
Stratospheric temperature measurements from nanosatellite stellar occultation observations of refractive bending [PDF]
Atmospheric Measurement Techniques, 2023 Stellar occultation observations from space can probe the stratosphere and mesosphere at a fine vertical scale around the globe. Unlike other measurement techniques like radiosondes and aircraft, stellar occultation has the potential to observe the ...
D. L. McGuffin +8 more
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Neural Network Calibration of Star Trackers
IEEE Transactions on Instrumentation and Measurement, 2022 <p>To maintain ideal performance, star trackers must be able to predict the direction of incident starlight to within a few arcseconds across the entire instrument field of view (FOV). Parametric camera models are commonly used to calculate star vectors from camera images and correct for aberrations in the instrument optics.
Shaghayegh Khodabakhshian, John Enright
openaire +1 more source
Low-Frequency Error Extraction and Compensation for Attitude Measurements from STECE Star Tracker
Sensors, 2016 The low frequency errors (LFE) of star trackers are the most penalizing errors for high-accuracy satellite attitude determination. Two test star trackers- have been mounted on the Space Technology Experiment and Climate Exploration (STECE) satellite, a ...
Yuwang Lai +4 more
doaj +1 more source