منابع مشابه
Parallelizing State Space Plans Online
Searching for parallel solutions in state space planners is a challenging problem, because it would require the planners to branch on all possible subsets of parallel actions, exponentially increasing their branching factor. We introduce a variant of our heuristic state search planner AltAlt, which generates parallel plans by using greedy online parallelization of partial plans. Empirical resul...
متن کاملSpace and satellite technology
Univ.-Prof. Dr. Wolfgang Bösch Over the last decades Space and satellite technology has increasingly become part of our daily lives, be it regular weather forecasts based on satellite images, the multitude of TV channels distributed via satellites or the navigational GPS support we find in almost every car—not to mention the many other services and science missions that are based on modern sate...
متن کاملSpace Environment and Evaluation of Typical High Altitude Satellite
The space environment consists mainly of high-energy charged particles, such as protons, electrons and heavy ions. They are originating from several sources including galactic cosmic radiation, solar flares and van Allen belts. High energy electromagnetic radiation and neutrons have also been measured on spacecraft. Although shielding can reduce the effect of space radiation it cannot be elimin...
متن کاملThe Failure of a Small Satellite and the Loss of a Space Science Mission
On March 4, 1999, the Wide-Field Infrared Explorer (WIRE) was launched from Vandenberg Air Force Base on a Pegasus XL launch vehicle into a 540 km orbit with a planned mission duration of four months. WIRE was designed to conduct a deep infrared, extra galactic science survey 500 times more sensitive than the Infrared Astronomy Satellite (IRAS) Faint Source Catalog. The instrument consists of a...
متن کاملSatellite to Satellite Tracking in the Space-wise Approach
The launch of the champ mission in 2000 has renewed interest in the recovery of the geopotential field from satellite observations which has been a challenging research issue for decades. It was the first dedicated gravity field mission which was followed by the grace spacecrafts. In the grace mission, the high-low (hl-) and the low-low satellite-to-satellitetracking (ll-sst) observations are c...
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ژورنال
عنوان ژورنال: Nature
سال: 1995
ISSN: 0028-0836,1476-4687
DOI: 10.1038/373178b0