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Satellite terminals with fixed antennas, such as the TV dish on the garage or the corner of the house.
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∙ 14y ago
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How many satellites do you need for a GPS to find your position on earth?
There are 24 satellites in the United States GPS system that are active. There are 6 more that are "asleep" and saving power until they are activated to replace one of the 24 satellites that has to be taken off line for maintenance, damage, and so forth.The Russians also have roughly that number of satellites in their GLONASS system.Europe is deploying satellites in its Galileo positioning system.Japan has or will launch its first satellite in its QTZZ positiong system.There are also about 4 satellites in WAAS, the Wide Area Augmentation System that makes GPS more accurate. Europe's version of this is EGNOS, or European Geostationary Overlay Service. It has 4 or 5 satellites.
Where do geostationary satellites usually orbit?
SatellitesSatellites orbit in outer space, not in the earth. They are sent to outer space where the gravitational pull of the earth pulls them around, just as the earth is pulled around the sun in a similar manner. The layer is the exosphere. It greatly depends on what the satellite is for and who owns it how far up it orbits. Imaging satellites need to be close to the Earth, so they orbit about 130 miles up. Communications satellites are generally at 23,000 miles up. GPS satellites are up about 13,000 miles.
How many satellites have been to uranus?
100 and there is life on uranus... go check
Why do satallites have to stay in the equotorial plane?
Staying at the "same point" (i.e., above the same location on Earth) is onlyimportant for a Geosynchronous satellite, which must occupy a very high orbit.Most satellites (and the International Space Station) are in lower orbits, whichmeans they orbit the Earth faster than it rotates, so they don't stay in thesame place.===================================Answer #1:Now to deal with the question . . .If the satellite is going to be used by non-technical people with little 'dishes'on the corner of their house or garage, it's important that they not need tomove their dish to follow the satellite across the sky. If people couldn't "setit and forget it", there would be no Dish network or Direct TV or any of theothers, because very few customers would be willing to do what it takes tokeep their dish tracking the satellite. Sure it could be automated, with amotorized mechanism that constantly steers the dish to follow the satellite.But that would cost 20 times what those dinky dishes cost now, and again,the operators would not "have a business". The only way that this wholescheme of satellite-direct-to-the-home can work is to make the satellitemotionless in the sky. The installer comes to your house, mounts the dish,'finds' the satellite, points the dish in that direction, and locks it permanentlyin that position. That's the only way the business model can work.
How many satellites do you need to have a full GPS signal?
At leAst 3
Are geostationary orbit and equatorial orbit same?
No. Geostationary orbits are equatorial, but equatorial orbits are not necessarily geostationary. To be geostationary, the orbit needs to be equatorial, circular and at the altitude such that one orbit takes one sidereal day (approximately 24 hours 3 minutes 56 seconds. ) An equatorial orbit need only be located above the equator, may have any period and need not be circular.
What is geostationony orbit?
A geostationary obit means the object doesn't move when observed over time. For example - the moon orbits the Earth - which is why it moves across the sky over time. Conversely - the network of GPS satellites are geostationary - because they need to remain in a fixed place in order for the receivers to measure their location accurately.
Why are old satellites brought back from space?
Unless they are especially valuable or designed to be returned, they aren't "brought back". They simply fall back as their orbit slows relative to the earth due to drag from gravity, magnetic fields, dust and gas. To keep a satellite in orbit permanently it would have to be moved up periodically (some can do this on their own). Sometimes satellites run out of the fuel they need to have their orbits adjusted to keep them in the right place. Geostationary satellites need to be moved every two weeks.
What has the author Enrico P Mercanti written?
Enrico P. Mercanti has written: 'Need for expanded environmental measurement capabilities in geosynchronous earth orbit' -- subject(s): Geostationary satellites, Artificial satellites in remote sensing
How does the satellite transmit tv programs inspite of the fact that it moves all the time?
Answer: A geostationary satellite is any satellite which is placed in a geostationary orbit. Satellites in geostationary orbit maintain a constant position relative to the surface of the earth. Geostationary satellites do this by orbiting the earth at approximately 22,300 miles above the equator. At this altitude, the speed of a satellite's rotation around the world is identical to the rotational speed of the world itself. While the satellite is actually moving; but moving at the same speed as the rotational speed of the world itself, it is always appears in the same azimuthal (angle); latitudinal and longitudinal position of the sky over the equator. Being geostationary allows an earth receiving & transmitting station to maintain bidirectional communications with satellites without the need of having to always reposition the earth based "dish" like antenna. A practical example is one's home whose television is connected to a unidirectional (receives only) dish antenna. If the satellite that the dish antenna is aimed at was not geostationary, people would lose the satellite's signal as soon as it deviated one degree from its position. In general, all data, audio & video satellites are launched into a geostationary orbit.
How many satellites do you need for a GPS to find your position on earth?
There are 24 satellites in the United States GPS system that are active. There are 6 more that are "asleep" and saving power until they are activated to replace one of the 24 satellites that has to be taken off line for maintenance, damage, and so forth.The Russians also have roughly that number of satellites in their GLONASS system.Europe is deploying satellites in its Galileo positioning system.Japan has or will launch its first satellite in its QTZZ positiong system.There are also about 4 satellites in WAAS, the Wide Area Augmentation System that makes GPS more accurate. Europe's version of this is EGNOS, or European Geostationary Overlay Service. It has 4 or 5 satellites.
Why a precise geo stationary orbit can not be obtained?
Because the geostationary orbit round the Earth is perturbed by gravity from the Sun and Moon. The biggest effect is to change the orbital plane of the geostationary satellite so that, after a while on station, in 24 hours it appears to move up and down slightly. For that reason communications satellites need motors and fuel to correct the orbit from time to time.
Why is geostationary important?
A geostationary satellite is an earth-orbiting satellite, placed at an altitude of approximately 35,800 kilometers (22,300 miles) directly over the equator, that revolves in the same direction the earth rotates (west to east). At this altitude, one orbit takes 24 hours, the same length of time as the earth requires to rotate once on its axis. The term geostationary comes from the fact that such a satellite appears nearly stationary in the sky as seen by a ground-based observer. In other words a satellite that orbits a specific part of the earth while the earth is rotating so it looks like the satellite doesn't move. For example if you put a satellite over over the geographic US it will stay over the US and turn with the earth around the axis without ever loosing site of the US.
What kind of orbit are observation satellites usually placed in?
You mean Earth observation satellites, and the answer is near-Polar low-Earth orbits. This means that as the satellite orbits from above one pole to the other, the Earth turns beneath it, and the satellite passes over the Equator, and every other point on its orbit, at a different place on each successive orbit. In this way, after enough orbits, it can view the whole Earth. Earth observation satellites are placed in low-Earth orbit because (a) they travel faster over the ground at lower altitude and (b) being closer to the ground, their telescopes do not need to be so powerful to achieve a given spatial resolution. Military observation, or spy, satellites, are often placed in a high parking orbit until they are needed, whereupon they are placed into a highly elliptical orbit to allow them to come very close to Earth (and hence see it with great detail) over the region of interest.
Does the sun always - or nearly always - shine on the geostationary orbit. I'm not planning to send my own satellite just yet but I was wondering if the satellites need batteries at all?
Satellites in conventional geosynchronous orbit do occasionally pass into the Earth's shadow, but never spend much time there; 90 minutes or so at max, and only for a few orbits each year at or near the equinoxes. "Conventional" geo-synch is along the Earth's equator, and the only time the Earth's umbra is straight out from the equator is when the Sun is itself above (or very close to!) the equator.
What is a geostation satellite?
Geostationary satellites orbit high above the surface of the earth at about 35,000km, directly above the equator. The take the same time to complete one orbit as the earths surface as it rotates meaning it is always above the same point on earth. They are used for TV and telephone signals as well as weather imagery, among other things. A satellites period, the time it takes it to go around the earth, is determined, in part, by its altitude. The further away it is then the longer it will take. You can calculate an altitude where it will take just one day to make an orbit. If this is done then though the satellite orbits the earth it appears to be stationary above one point of the earth. This orbit must be above, or very near to, the equator. For the earth this altitude is approximately 36,000 km (22,000 miles)
Why are ground stations in continuous contact with satellites in geostationary orbit?
Just imagine managing a system of communication satellites which were non-geostationary. Data needs to be sent to one city, one home, but the satellite for the job is different every time. The task would be manageable, but unnecessarily difficult. Further more, metropolises must have priority over small towns- or oceans. New York needs more satellites than Apple Creek Ohio or the Atlantic Ocean. Finally, many satellites serve a very specific audience. Your favorite radio station would almost never come into reception if the satellite broadcasting it is circling the world.
