1. Introduction
In 1957 a major event marked the beginning of a new era in Earth Observation: the first artificial satellite (Sputnik) was launched by the Soviet Union.In astronomy, a satellite will ...
27 LED. 2010
Datum vydání
50873
Zobrazení
Geostationary orbits of 36,000km from the Earth's equator are best known for the many satellites used for various forms of telecommunication, including television. Signals from these satellites can be sent all the way round the world. Telecommunication needs to "see" their satellite all time and hence it must remain stationary in the same positions relative to the Earth's surface.
Okno médií
A stationary satellite provides the advantage for remote sensing that it always views the Earth from the same perspective, which means that it can record the same image at brief intervals. This arrangement is particularly useful for observations of weather conditions. One disadvantage of geostationary orbits is the great distance to the Earth, which reduces the achievable spatial resolution.
Okno médií
There are a number of weather satellites evenly distributed in geostationary orbit all around the world to provide a global view.
Okno médií
2. Orbit
A satellite can remain in the same orbit for a long period of time as the gravitational pull of the Earth provides a balance to the centrifugal force. As the ...
3. Geostationary orbit
Geostationary orbits of 36,000km from the Earth's equator are best known for the many satellites used for various forms of telecommunication, including television. Signals from these satellites can be sent ...
4. Polar orbit
As the name suggests, polar orbits pass over the Earth’s polar regions from north to south. The orbital track of the satellite does not have to cross the poles exactly ...
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