Zobrazeno 1 - 7
of 7
pro vyhledávání: '"Alexander Frias"'
Publikováno v:
Sensors, Vol 21, Iss 4, p 1472 (2021)
In recent years, we have seen significant improvements in the digital sun sensor (DSS) design enabled by advanced micro-systems fabrication and optical sensing technologies. In this paper, we propose a simple single-slit DSS concept with improved acc
Externí odkaz:
https://doaj.org/article/ae07c0d2db504f2cbc43be555d48d511
Autor:
Alexander Frias
Publikováno v:
Alexander Frias
Spacecraft formation flying with coupled orbital-attitude dynamics is one of the most intriguing topics in the field of astronautics. Orbital-attitude coupling is induced when a non-symmetrical spacecraft in orbit is disturbed by means of active mane
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::da67902119e6d0f6e748b8ddd477e5ac
https://doi.org/10.32920/ryerson.14665602
https://doi.org/10.32920/ryerson.14665602
Autor:
Alexander Frias
Publikováno v:
Alexander Frias
This dissertation investigates the nonlinear control of the attitude for an underactuated rigid-body spacecraft system in the body-orbital and inertial frames. The problem involving the stabilization of the body-orbital attitude of an underactuated o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3cbc38c3f867fccdaffab465c9f28656
https://doi.org/10.32920/ryerson.14655867.v1
https://doi.org/10.32920/ryerson.14655867.v1
Publikováno v:
Sensors (Basel, Switzerland)
Sensors, Vol 21, Iss 1472, p 1472 (2021)
Sensors
Volume 21
Issue 4
Sensors, Vol 21, Iss 1472, p 1472 (2021)
Sensors
Volume 21
Issue 4
In recent years, we have seen significant improvements in the digital sun sensor (DSS) design enabled by advanced micro-systems fabrication and optical sensing technologies. In this paper, we propose a simple single-slit DSS concept with improved acc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::30dd35ef1430a1669ca43d533d98fe60
https://pubmed.ncbi.nlm.nih.gov/33672501
https://pubmed.ncbi.nlm.nih.gov/33672501
Autor:
Jongdae Sohn, Yukinaga Miyashita, Young-Sil Kwak, Jaeheung Park, Jaejin Lee, Jongkil Lee, Keunchan Park, Ji-Young Kim, Alexander Frias, Junga Hwang, Park Wooyeon, Yu Yi, Kyung-Chan Kim
Publikováno v:
Journal of Space Weather and Space Climate, Vol 11, p 38 (2021)
In this paper, an operational Dst index prediction model is developed by combining empirical and Artificial Neural Network (ANN) models. ANN algorithms are widely used to predict space weather conditions. While they require a large amount of data for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::906ff1500751df02342188a86dc2c5a7
https://www.swsc-journal.org/articles/swsc/full_html/2021/01/swsc200062/swsc200062.html
https://www.swsc-journal.org/articles/swsc/full_html/2021/01/swsc200062/swsc200062.html
Publikováno v:
Journal of Guidance, Control, and Dynamics. 41:1068-1082
This paper examines the velocity-free attitude stabilization of an underactuated nadir-pointing rigid spacecraft in a circular orbit in the presence of time-varying disturbances. A nonlinear observ...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::23d828adfbca3e351dc329f8c8db37bd
https://doi.org/10.2514/1.g003281
https://doi.org/10.2514/1.g003281
Publikováno v:
Automatica. 109:108553
The attitude stabilization of an inertial-pointing underactuated rigid-body spacecraft using two torques under time-varying disturbances and inertia matrix uncertainties is examined. An observer-based time-varying output feedback control law is propo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e7b5d98c58d2ad5ec65f57db8a628853
https://doi.org/10.1016/j.automatica.2019.108553
https://doi.org/10.1016/j.automatica.2019.108553