Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Joseph A. Hashmall"'
Autor:
Joseph A. Hashmall
Publikováno v:
Journal of Aerospace Engineering, Sciences and Applications. 4:60-72
This paper describes the alignment calibration of spacecraft High Gain Antennas (HGAs) for three missions. For two of the missions (the Lunar Reconnaissance Orbiter and the Solar Dynamics Observatory) the calibration was performed on orbit. For the t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::43a82542e4957dfa3d6811a55cc4bc11
https://doi.org/10.7446/jaesa.0401.06
https://doi.org/10.7446/jaesa.0401.06
Publikováno v:
AIAA Guidance, Navigation, and Control Conference.
This paper describes the process of identification and analysis of warm pixels in two autonomous star trackers on the Solar Dynamics Observatory (SDO) mission. A brief description of the mission orbit and attitude regimes is discussed and pertinent s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4b30b5ca107cea7f7e4d82ce918b8672
https://doi.org/10.2514/6.2011-6728
https://doi.org/10.2514/6.2011-6728
Publikováno v:
AIAA/AAS Astrodynamics Specialist Conference and Exhibit.
This paper describes early mission ground attitude support experience with two spinning spacecraft missions: Space Technology-5 (ST-5) and Time History of Events and Macroscale Interactions during Substorms (THEMIS). These missions used the National
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::32b25194366c8cf15d7b7bd82951485b
https://doi.org/10.2514/6.2008-6600
https://doi.org/10.2514/6.2008-6600
Autor:
Joseph A. Hashmall
Publikováno v:
AIAA/AAS Astrodynamics Specialist Conference and Exhibit.
The "cones method" is an analytical algorithm to combine a pair of angle observations into a common vector. Two new algorithms have been developed to optimize the "cones method" solutions when more than two observation angles are available and when e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::06fa45c38eba3e35301224a2b5066246
https://doi.org/10.2514/6.2006-6162
https://doi.org/10.2514/6.2006-6162
Autor:
Joseph Sedlak, Joseph A. Hashmall
Publikováno v:
AIAA/AAS Astrodynamics Specialist Conference and Exhibit.
This paper describes ongoing work a NASA/Goddard Space Flight Center to improve the quality of spacecraft attitude sensor calibration and reduce costs by automating parts of the calibration process. The new calibration software can autonomously previ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::da1ccd87cc10ab06a40922bcc5754b1f
https://doi.org/10.2514/6.2004-4854
https://doi.org/10.2514/6.2004-4854
Autor:
Joseph A. Hashmall
Publikováno v:
54th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law.
The stars observed by onboard star trackers must be identified in order for the star tracker information to be used for attitude determination. Star identification associates the observed stars in the body frame with catalog stars, the positions of w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::034a728cd5c5a636b0e7b1941eb465cc
https://doi.org/10.2514/6.iac-03-a.5.02
https://doi.org/10.2514/6.iac-03-a.5.02
Publikováno v:
Astrodynamics Specialist Conference.
In order to maneuver satellites accurately from one attitude to another, onboard rate sensing gyroscopes usually must be calibrated after launch. Several algorithms have been used to determine gyro biases, misalignments, and scale factors. This paper
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0130d7c77c2b9b9d41f0c534d67f71a2
https://doi.org/10.2514/6.2000-4244
https://doi.org/10.2514/6.2000-4244
Publikováno v:
Journal of Heterocyclic Chemistry. 28:1993-1995
The possibility that the similarity of Hammett ρ values for several very different reactions of 2-arylaziridinium salts is due to ground state effects was investigated by MO methods and ESCA. Minimum energy structures of p-nitrophenyl-, phenyl-, and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4b2cea2a556d2e4cbe1082723293aef7
https://doi.org/10.1002/jhet.5570280834
https://doi.org/10.1002/jhet.5570280834
Autor:
Ronald A. DeMarco, Patrick Brant, Joseph A. Hashmall, W.B. Fox, A. D. Berry, Forrest L. Carter
Publikováno v:
Journal of Electron Spectroscopy and Related Phenomena. 22:119-129
The core level X-ray photoelectron spectra (XPS) of CF 3 CCCF 3 , CF 3 CCSF 5 and SF 5 CCSF 5 have been measured in the solid state. Gas phase spectra of CF 3 CCCF 3 and CF 3 CCSF 5 have also been obtained. The XPS data, interpreted with the point ch
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f11b59d06d703c61b8e937172e3bebbd
https://doi.org/10.1016/0368-2048(81)80021-7
https://doi.org/10.1016/0368-2048(81)80021-7
Publikováno v:
Journal of the American Chemical Society. 103:329-334
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::60edba202b4f4a46c8974a935a308685
https://doi.org/10.1021/ja00392a015
https://doi.org/10.1021/ja00392a015