Zobrazeno 1 - 10
of 11
pro vyhledávání: '"David A. Vallado"'
Autor:
David A. Vallado, Daniel Oltrogge
Publikováno v:
2019 15th Hypervelocity Impact Symposium.
The Debris Risk Evolution And Dispersal (DREAD) tool facilitates the 3D modeling and risk analysis of the fragmentation cloud after a collision or explosion. This tool uses the NASA Standard Breakup Model and other breakup models “under the hood”
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dbe7bfde8c4bf0fcf94d96290f35309c
https://doi.org/10.1115/hvis2019-054
https://doi.org/10.1115/hvis2019-054
Autor:
Prakash Shiggavi, Vineet K. Srivastava, Shivali Kulshrestha, David A. Vallado, Badam Singh Kushvah, Jai Kumar, M.K. Bhaskar, Ashutosh Srivastava
Publikováno v:
Acta Astronautica. 110:206-213
A solar eclipse occurs when the Sun, Moon and Earth are aligned in such a way that shadow of the Moon falls on the Earth. The Moon׳s shadow also falls on the Earth orbiting spacecraft. In this case, the alignment of the Sun, Moon, and spacecraft is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fc3365bee3f9ab78628c3dd135afa9bc
https://doi.org/10.1016/j.actaastro.2015.01.020
https://doi.org/10.1016/j.actaastro.2015.01.020
Autor:
David A. Vallado, Salvatore Alfano
Publikováno v:
Celestial Mechanics and Dynamical Astronomy. 118:253-271
Relative motion improvements have traditionally focused on inserting additional force models into existing formulations to achieve greater fidelity, or complex expansions to admit eccentric orbits for propagation. A simpler approach may be numericall
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bff9a616c584000f7be0ac9334f42067
https://doi.org/10.1007/s10569-014-9531-1
https://doi.org/10.1007/s10569-014-9531-1
Autor:
David A. Vallado, David Finkleman
Publikováno v:
Acta Astronautica. 95:141-165
This paper examines atmospheric drag models and data usage involved with propagating near-Earth satellites. Many studies, and even some International standards try to promote one model over another, rather than identifying the behavior of the numerou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::31b2873acadad79edda6ae1f76bdf27d
https://doi.org/10.1016/j.actaastro.2013.10.005
https://doi.org/10.1016/j.actaastro.2013.10.005
Publikováno v:
AIAA/AAS Astrodynamics Specialist Conference.
Here, observing geosynchronous satellites has numerous applications. Lighting conditions near the equinoxes routinely cause problems for traditional observations of sensors near the equator – the solar exclusion. We investigate using sensors on sat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a5faddaa1ca00cbada9aad58ed565222
https://doi.org/10.2514/6.2016-5433
https://doi.org/10.2514/6.2016-5433
Autor:
David A. Vallado, Salvatore Alfano
Publikováno v:
Celestial Mechanics and Dynamical Astronomy. 125:263-264
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2c76a4fd2193e0473760b19035535ab4
https://doi.org/10.1007/s10569-016-9675-2
https://doi.org/10.1007/s10569-016-9675-2
Autor:
Scott S. Carter, David A. Vallado
Publikováno v:
The Journal of the Astronautical Sciences. 46:195-213
Requirements have existed for several decades for highly accurate satellite orbits. With increased computer power, simplified analytical techniques have lost most of their competitive edge and numerical techniques are experiencing wide-spread popular
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8e27e8b15cb505855400ece350730181
https://doi.org/10.1007/bf03546243
https://doi.org/10.1007/bf03546243
Autor:
David A. Vallado, Beny Neta
Publikováno v:
The Journal of the Astronautical Sciences. 46:91-103
The problem of computing Earth satellite entry and exit positions through the Earth’s umbra and penumbra, for satellites in elliptical orbits, is solved without the use of a quartic equation. A condition for existence of a solution in the case of a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2ca4f9cac0f87050d5316b66501b8f65
https://doi.org/10.1007/bf03546195
https://doi.org/10.1007/bf03546195
Autor:
David A. Vallado
Publikováno v:
Encyclopedia of Aerospace Engineering
Reviews basic statements of the equations of motion, including Kepler's and Newton's laws and the constants of orbital motion. Orbital elements are introduced and the two-body problem is shown along with conic sections. These relations form the basis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::15fc9741f588ac8cb6d27a4b81ef48b8
https://doi.org/10.1002/9780470686652.eae285
https://doi.org/10.1002/9780470686652.eae285
