Results 31 to 40 of about 4,489 (256)

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, Elena Hervas-Martin, Jonathan Byrne, Aubrey Dunne, Jose Luis Espinosa-Aranda, David Rijlaarsdam   +5 more
doaj   +1 more source

Correction of rotational blur in images of stars observed by an astroinertial attitude sensor against the background of the daytime sky

Компьютерная оптика, 2023
A rotational blur correction algorithm is considered as the initial stage of image processing in the problem of attitude measurement using a star tracker. To implement this algorithm, the star tracker must be equipped with a three-axis gyroscope.
N.N. Vasilyuk
doaj   +1 more source

Astronomy: Star tracker [PDF]

Nature, 2013
As an early adopter of astronomical technology, Andrea Ghez is revealing secrets about the giant black hole at the Galaxy's centre.
openaire   +1 more source

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, Ilija Jovanovic, Brendon Vaz   +2 more
openaire   +1 more source

A Heavy Flavor Tracker for STAR [PDF]

, 2005
We propose to construct a Heavy Flavor Tracker (HFT) for theSTAR experiment at RHIC. The HFT will bring new physics capabilities toSTAR and it will significantly enhance the physics capabilities of theSTAR detector at central rapidities. The HFT will ensure that STAR willbe able to take heavy flavor data at all luminosities attainablethroughout the ...
Xu, Z., Chen, Y., Kleinfelder, S., Koohi, A., Li, S., Huang, H., Tai, A., Kushpil, V., Sumbera, M., Colledani, C., Dulinski, W., Himmi, A., Hu, C., Shabetai, A., Szelezniak, M., Valin, I., Winter, M., Surrow, B., Van Nieuwenhuizen, G., Bieser, F., Gareus, R., Greiner, L., Lu, Y., Lesser, F., Matis, H. S., Oldenburg, M., Ritter, H. G., Pierpoint, L., Retiere, F., Rose, A., Ruan, L., Schweda, K., Sichtermann, E., Thomas, J. H., Wieman, H., Yamamoto, E., Kotov, I., Xu, N., Zhang, Y.   +38 more
openaire   +6 more sources

STAR forward detector upgrade status and performance [PDF]

EPJ Web of Conferences
An upgrade to the STAR detector system at forward rapidities has been completed before the RHIC RUN 2022. It consists of the Forward Tracking System (FTS) and the Forward Calorimeter System (FCS).
Wang Zhen
doaj   +1 more source

Selection of Design Parameters in Optical System of Star Tracker for a Satellite [PDF]

Journal of Astronomy and Space Sciences, 1999
In order to develop star trackers for a satellite in our country we studied selection procedure of optical parameters. For logical selection of the optical parameters, we simulated the entire processes in which star lights imaged on a CCD sensor were ...
Ja-Kyung Nah, Yong Ha Kim, Yu Yi
doaj  

A Survey of Lost-in-Space Star Identification Algorithms Since 2009

Sensors, 2020
The lost-in-space star identification algorithm is able to identify stars without a priori attitude information and is arguably the most critical component of a star sensor system.
David Rijlaarsdam, Hamza Yous, Jonathan Byrne, Davide Oddenino, Gianluca Furano, David Moloney   +5 more
doaj   +1 more source

Protein pyrophosphorylation by inositol pyrophosphates — detection, function, and regulation

FEBS Letters, EarlyView.
Protein pyrophosphorylation is an unusual signaling mechanism that was discovered two decades ago. It can be driven by inositol pyrophosphate messengers and influences various cellular processes. Herein, we summarize the research progress and challenges of this field, covering pathways found to be regulated by this posttranslational modification as ...
Sarah Lampe, Tanmay Kumar Mohanty, Rashna Bhandari, Dorothea Fiedler   +3 more
wiley   +1 more source

A Robust Star Identification Algorithm Based on a Masked Distance Map

Remote Sensing, 2022
The authors of this paper propose a robust star identification algorithm for a ‘Lost-In-Space’-mode star tracker for lost-cost CubeSat missions. A two-step identification framework and an embedded validation mechanism were designed to accelerate the ...
Hao Yuan, Dongxu Li, Jie Wang
doaj   +1 more source