Results 211 to 220 of about 15,357 (267)
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Determination of the Range of the Spacecraft
2019 International Siberian Conference on Control and Communications (SIBCON), 2019As a result of the gravitational attraction of the Sun/Moon/Earth, the pressure of solar radiation and other factors, the spacecraft located in the geostationary orbit deviates from the real orbit. The position of the spacecraft is regulated by a short pulse switching by correcting engines.
Панько Сергей Петрович (Panko S.P.) +3 more
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2011
The Giotto spacecraft (Fig. 1), the first ESA (European Space Agency) interplanetary probe, was designed to flyby comet Halley. Launched on 2 July 1985 by an Ariane-1 rocket from Kourou, Giotto succeeded in approaching the cometary nucleus to within 600 km on 14 March 1986. Through its first accurate images of a nucleus and in situ studies of gases and
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The Giotto spacecraft (Fig. 1), the first ESA (European Space Agency) interplanetary probe, was designed to flyby comet Halley. Launched on 2 July 1985 by an Ariane-1 rocket from Kourou, Giotto succeeded in approaching the cometary nucleus to within 600 km on 14 March 1986. Through its first accurate images of a nucleus and in situ studies of gases and
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SIMULATION, 1963
Computer simulation of electro/mechanical systems has become so important in our world of technical complexity that to many of us the very word "Simulation" has come to suggest first---if not exclusively---just that; the computer simulation of complex physical systems.
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Computer simulation of electro/mechanical systems has become so important in our world of technical complexity that to many of us the very word "Simulation" has come to suggest first---if not exclusively---just that; the computer simulation of complex physical systems.
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Spacecraft charging - An update
34th Aerospace Sciences Meeting and Exhibit, 1996Summary form only given. Nearly twenty years after the landmark SCATHA program, spacecraft charging and its associated plasma interactions continue to be major issues for Earth-orbiting spacecraft. Although typically thought of as a surface effect on geosynchronous spacecraft, internal charging and low-altitude phenomena are increasingly causing ...
H.B. Garrett, A.C. Whittlesey
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Proceedings of the First NASA/DoD Workshop on Evolvable Hardware, 2003
Two major steps in the evolution of autonomous, longlife spacecraft computing systems have been the demonstrations of systems with one-year and ten-year life expectancies in space. This paper discusses the design concept of a distributed, diversified self-testing and self-repairing computing system that is embedded in an autonomous spacecraft and ...
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Two major steps in the evolution of autonomous, longlife spacecraft computing systems have been the demonstrations of systems with one-year and ten-year life expectancies in space. This paper discusses the design concept of a distributed, diversified self-testing and self-repairing computing system that is embedded in an autonomous spacecraft and ...
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IEEE Software, 2013
How much software does it take to land a spacecraft safely on Mars, and how do you make all that code reliable? This column describes such a software development process. The first Web extra at http://mars.jpl.nasa.gov/multimedia/videos/movies/miam20121218/miam20121218-1280.mov is a 60-second video from NASA's Jet Propulsion Laboratory that shows how ...
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How much software does it take to land a spacecraft safely on Mars, and how do you make all that code reliable? This column describes such a software development process. The first Web extra at http://mars.jpl.nasa.gov/multimedia/videos/movies/miam20121218/miam20121218-1280.mov is a 60-second video from NASA's Jet Propulsion Laboratory that shows how ...
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Space Science Reviews, 1983
This paper gives an overview of electrostatic charging which occurs on spacecraft in different plasma environments. Particular emphasis is given to differential charging between sunlit and shadowed insulated surfaces, a phenomenon which is often observed in the geostationary orbit.
R. Grard, K. Knott, null Pedersen
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This paper gives an overview of electrostatic charging which occurs on spacecraft in different plasma environments. Particular emphasis is given to differential charging between sunlit and shadowed insulated surfaces, a phenomenon which is often observed in the geostationary orbit.
R. Grard, K. Knott, null Pedersen
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On spacecraft attitude display
SIMULATION, 1987A calculation minimised procedure for the graphics display of spacecraft attitude changes is presented. Based on the attitude errors, the body orientations with respect to two fundamental reference frames are computed and plotted using multiple view ports.
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Electronically Steerable Antennas for Spacecraft-to-Spacecraft Communications
Navigation, 1965This paper presents several electronically steerable antenna techniques, which for frequencies from 1 to 35 gc, show promise for application to spacecraft-to-spacecraft communications. It is indicated that such antennas can be realistically designed to provide maximum antenna gain for given weight, maximum bandwidth, and the capability of illuminating ...
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Spacecraft design considerations for spacecraft charging environments
2017 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC), 2017Spacecraft charging (surface and internal) is complex physical phenomena that can have serious ramifications on mission success. The degree of spacecraft charging a spacecraft may experience is heavily dependent on both the surrounding space environment and spacecraft geometry (more specifically, the geometry and material makeup of the spacecraft).
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