The invention concerns a method for estimating the angular velocity (and, preferably, also the attitude) of a space platform (for example, a satellite, a space vehicle, or a space station) using only the information provided by one or more optical sensors, such as one or more star trackers...
A 摘要: The problem of determination of the orbital velocity of an astrometric satellite from its own observational data is studied. It is well known that data processing of microarcsecond-level astrometric observations imposes very stringent requirements on the accuracy of the orbital velocity of ...
The surface velocity of a rapidly moving ice stream has been determined to high accuracy and spatial density with the use of sequential satellite imagery. Variations of ice velocity are spatially related to surface undulations, and transverse velocity variations of up to 30 percent occur. Such large...
Next, the ranges together with velocities from a single beam pass are combined to a measurement vector for a linear inversion problem. The solution of the inversion problem gives the time-dependent range and velocity from the time interval of satellite flight through the radar beam. The method ...
1.The velocity at which a body revolves about another body. 2.The minimum velocity required to place or maintain a satellite in a given orbit. American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by...
commercial satellite bus to rely on ion propulsion for GEO station keeping. While ion engines compete well with other EP options for near-earth applications, their ability to operate efficiently and reliably at even higher exhaust velocities makes them ideally suited for energetic (i.e., high Δ...
Circumbinary planets, those that orbit around both stars of a central binary star system, challenge our understanding of planet formation. With only 12 binary systems known to host circumbinary planets, identifying more of these planets, along with their physical properties, could help to discern som...
The solid line has been derived from lunar microcrater statistics and it is compared with satellite and spaceprobe measurements. In low Earth orbit the meteoroid flux is about a factor of two higher than in deep space because of the Earth's gravitational concentration. However, man-made space ...
B6--B9.5 stars in the field of view of the CoRoT The CoRoT satellite is collecting precise time-resolved photometry for tens of asteroseismology targets. To ensure a correct interpretation of the CoRoT da... E Niemczura,T Morel,C Aerts - 《Astronomy & Astrophysics》 被引量: 80发表: ...
Over a decade, Pissouri village has suffering from an active and fast-moving landslide causing severe damages in many properties and the broader landscape. This study presents an investigation to estimate the absolute velocity of the landslide using integrated satellite-based techniques, utilizing the ...