What are satellites used for?
Satellite television suppliers use a number of technologies, most all of which in some way relate to the electronics industry. The video signal is sent up and down in a digital format, and it is digitally encrypted on the uplink and decrypted by the downlink receiver on your end. All of this could b…e grouped under "computer science" as it's all digital. The electronics portions use electronics technology to make the thing work. Let's look a bit closer. The signals on the uplink and downlink all operate on microwave frequencies. This is a "new and improved" version of radio signals (microwaves are like radio waves, only higher in frequency) that uses a dish of some sort as an antenna on the earthside ends. All kinds of electronics technology apply here. We also should mention the physics involved in putting the satellite up in space and parking it in orbit. Rockets and satellites operate because mechanical, aeronautical, electrical, electronic and chemical engineers make it happen. There are other engineering aspects included in this as well. (MORE)
Imagine what we could NOT do without satellites!. No cell phone networking across towers, across the world. . No watching your favorite shows on TV. . No Internet. . No GPS system. . No airline flights -- they'd all crash into each other. . No ocean going ships battling the waves, whether you …want to go on a cruise or you want to eat fish in a restuarant. . No trusty weather forecasts. Forget about knowing if there will be a hurricane, tornado, or even rain. We'd be living back in the 1910s when no one could turn on a TV and see satellite weather images. . We'd never have those fantastic Google Maps or earth images taken from space. . (MORE)
Explorer 1 was launched by the US on 31 January 1958, cylindrical in shape as opposed to the 'Sputnik' which had been round. It remained in orbit until March 1970. Its major achievement was the discovery of the Van Allen radiation belts around the Earth. The first was Vangaurd. The first successful …U.S. satellite was Explorer I . It was launched into Earth orbit by the Army on January 31, 1958, at Cape Canaveral, Florida, four months after Russia orbited Sputnik. It weighed 18 pounds and had a cylindrical shape. It was 80 inches long and six inches in diameter. (MORE)
Satellites are useful in many ways such as giving us information daily, such as the weather forecast. Satellites are useful because of their location. Their location gives them a view of a large portion of the earth at once (versus for example a mountain top). This is useful for looking at weather …(e.g. clouds, temperature) and useful for communications (to allow two people to communicate from one part to another part of the world). Other location advantages include: - photographing the ground for thousands of purposes (military, mapping) - astronomy (the earth's atmosphere causes problems so being above it is helpful) Satellites also give us information for GPS', photo's and help in many discoveries. If we didn't have satellites we wouldn't know hardly anything about our solar-system, where we live, the planets and other solar-systems. Technology wouldn't be so nearly as huge! (MORE)
the weather. how the earth looks like from up in space. about metoer collisions and when ther about 2 collide wiv earth
If you're thinkiing of WW2, there were no such things as satellites at that time. In fact the first artificial satellite of the earth was launched by the Russians around 1957/58!
Yes, they provide the power needed to operate the satellite systems for the life of the satellite, so are essential.
it help support millitary activities 2-it help transfer telehone call over the ocean 4-they re used for exploring different planet 5-
We really depend on satellites and they help us out in every daylife. Satellites help us to know what the world looks like. Theyalso help us to travel, prepare for good and bad weather. they benefit the society
There are several uses of satellites which depends on theparticular type. In most cases, they are used for spaceexploration, communication of signals, navigation and astronomicalventures among others.
Internal Electrical Power: . The main power in satellite is from solar cells. Other sources are batteries and fuel cells. Nuclear power has its role in heating/powering satellites as well. Every once in awhile folks get antsy when a reactor powered satellite de-orbits and crashes.. Other Power: …. Satellites also have external power (thrust) for changing orbit and orientation and as a final de-orbitting mechanism. This may be in the form or chemical fuel. Ion discharges (electrical) may also be used for low power thrust. (MORE)
-- radio communications repeater... Westar, OSCAR, nine hundred vital TV channels, etc. -- navigation ... GPS, etc. -- global data collection and imaging ... weather, ocean temperature, forestation, ice cover, etc.
They use satellite images to see what a area looks like from above earth they also collect information that we cannot see from the planets surface.
As a planet, We use satellites for heaps of different reasons. The most common are for taking pictures of the earth to predict the weather and for the use of Gps devices. Satellites are very important because they can help predict some forms of natural disasters.
A satellite is built up of microscopic telescopes with cameras and mirrors. They have strong sight and can spot objects or different planets or stars from millions of miles away. They then collect the data and that data is sent through signals into a giant dish with antennas that send the data throu…gh wires and into the computers for astronomers or scientist to examine. (MORE)
Satellites are used for many purposes. Pictures of cloud patterns and other atmospheric events are used in weather prediction. They can receive and re-transmit all types of communications signals. This includes television, telephone calls and satellite radio signals. The can provide data that al…lows the Global Positioning Devices to pinpoint your current location.. (MORE)
There are over 1000 operational satellites orbiting the Earth, and probably 10,000 pieces of "space junk" also orbiting the Earth.
The Moon is, sometimes, used as a natural reflector for radio signals. The problem is that the surface of the Moon is so rough and uneven that most of the signal scatters back into space instead of bouncing back to Earth. Another reason is that the Moon can only reflect signals. Modern communicat…ions satellites actively rebroadcast the signal back to Earth. And finally, the Moon is only available for half of the day, and it keeps moving. Modern satellites in geosynchronous orbit appear to hang motionless in the sky, so your Earth-based antenna doesn't have to move to track it. To use the Moon as a reflector, you would need motors and tracking mechanisms to slew the dish to point at the Moon. The cost of the tracking mechanisms would certainly be over $100 each. $100 per dish times how many satellite dishes are there? and pretty soon putting a satellite in geosynch looks like the lower-cost option. (MORE)
If you are referring to the original satellite dish known as the C band satellite, the satellite company that used these was DISH Network.
Satellite Internet signals are transmitted by low altitude,geosynchronous orbiting satellites. In simple terms, this is thetype of satellite that travels the same speed as the Earth,directly over the equator and at a low altitude compared to othersatellites you may see. It spins at the same speed as… the Earth sothat it is always at the same spot in relation to your satellitedish. If satellites traveled at a different speed, then it would beimpossible to maintain a steady signal with a stationary dish. ------------------------------------------------------------------------------------------------------------------------------------------ There is no such thing as "low altitude, geosynchronousorbiting satellites"; low altitude orbits are all below about 500miles, geosynchronous orbits are all at 22,236 miles. At a distanceof 22,236 miles the turnaround time of ~0.25 seconds makes voiceand standard network protocols (e.g. TCP/IP) impractical, sogeostationary satellites are usually used only for noninteractivethings like Weather Imaging and Television Broadcasts. (MORE)
to take images of the earth and send it to google earth to show us t.v shows
it is used in tv,live telecast, to show pictures of earth and other planets etc......
Satellite imagery can be used to see storms from space. People on earth can keep track of the storm/weather and tell which way its coming, which can be used as a prediction. This prediction is televised on the news.
Concave mirrors focus light on a specific point. That can increase the concentration of sun light on solar panels. Concave antennae are used to aim radio waves, as well as collect them and focus them on a receiver.
artificial satellite object constructed by humans and placed in orbit around the earth or other celestial body (see also space probe). The satellite is lifted from the earth's surface by arocket and, once placed in orbit, maintains its motion without further rocket propulsion. The first artificial s…atellite, Sputnik I, was launched on Oct. 4, 1957, by the USSR; a test payload of a radio beacon and a thermometer demonstrated the feasibility of orbiting a satellite. The first U.S. satellite, Explorer I, launched on Jan. 31, 1958, returned data that was instrumental in the discovery of the Van Allen radiation belts. During the first decade of space exploration, all of the satellites were launched from either the United States or USSR. Today, there are more than three dozen launch sites in use or under construction in more than a dozen countries. Satellite Orbits If placed in an orbit high enough to escape the frictional effects of the earth's atmosphere, the motion of the satellite is controlled by the same laws of celestial mechanics that govern the motions of natural satellites, and it will remain in orbit indefinitely. At heights less than 200 mi (320 km) the drag produced by the atmosphere will slow the satellite down, causing it to descend into the denser portion of the atmosphere where it will burn up like a meteor. To attain orbital altitude and velocity, multistage rockets are used, with each stage falling away as its fuel is exhausted; the effect of reducing the total mass of the rocket while maintaining its thrust is to increase its speed, thus allowing it to achieve the required velocity of 5 mi per sec (8 km per sec). At this speed the rocket's forward momentum exactly balances its downward gravitational acceleration, resulting in orbit. Once above the lower atmosphere, the rocket bends to a nearly horizontal flight path, until it reaches the orbital height desired for the satellite. Unless corrections are made, orbits are usually elliptical; perigee is the point on the orbit closest to the earth, and apogee is the point farthest from the earth. Besides this eccentricity an orbit of a satellite about the earth is characterized by its plane with respect to the earth. An equatorial orbit lies in the plane of the earth's orbit. A polar orbit lies in the plane passing through both the north and south poles. A satellite's period (the time to complete one revolution around the earth) is determined by its height above the earth; the higher the satellite, the longer the period. At a height of 200 mi (320 km), the period of a circular orbit is 90 min; at 500 mi (800 km), it increases to 100 min. At a height of 22,300 mi (36,000 km), a satellite has a period of exactly 24 hr, the time it takes the earth to rotate once on its axis; such an orbit is called geosynchronous. If the orbit is also equatorial, the satellite will remain stationary over one point on the earth's surface. Tracking and Telemetry Since more than 1,000 satellites are presently in orbit, identifying and maintaining contact requires precise tracking methods. Optical and radar tracking are most valuable during the launch; radio tracking is used once the satellite has achieved a stable orbit. Optical tracking uses special cameras to follow satellites illuminated either by the sun or laser beams. Radar tracking directs a pulse of microwaves at the satellite, and the reflected echo identifies both its direction and distance. Nearly all satellites carry radio transmitters that broadcast their positions to tracking antennas on the earth. In addition, the transmitters are used for telemetry, the relaying of information from the scientific instruments aboard the satellite. Types of Satellites Satellites can be divided into five principal types: research, communications, weather, navigational, and applications. Research satellites measure fundamental properties of outer space, e.g., magnetic fields, the flux of cosmic rays and micrometeorites, and properties of celestial objects that are difficult or impossible to observe from the earth. Early research satellites included a series of orbiting observatories designed to study radiation from the sun, light and radio emissions from distant stars, and the earth's atmosphere. Notable research satellites have included the Hubble Space Telescope, the Compton Gamma-Ray Observatory, the Chandra X-ray Observatory, the Infrared Space Observatory, and the Solar and Heliospheric Observatory (see observatory, orbiting). Also contributing to scientific research were the experiments conducted by the astronauts and cosmonauts aboard the space stations launched by the United States ( Skylab ) and the Soviet Union ( Salyut and Mir ); in these stations researchers worked for months at a time on scientific or technical projects. The International Space Station, whose first permanent crew boarded in 2000, continues this work. Communications satellites provide a worldwide linkup of radio, telephone, and television. The first communications satellite was Echo 1 ; launched in 1960, it was a large metallized balloon that reflected radio signals striking it. This passive mode of operation quickly gave way to the active or repeater mode, in which complex electronic equipment aboard the satellite receives a signal from the earth, amplifies it, and transmits it to another point on the earth. Relay 1 and Telstar 1, both launched in 1962, were the first active communications satellites; Telstar 1 relayed the first live television broadcast across the Atlantic Ocean. However, satellites in the Relay and Telstar program were not in geosynchronous orbits, which is the secret to continuous communications networks. Syncom 3, launched in 1964, was the first stationary earth satellite. It was used to telecast the 1964 Olympic Games in Tokyo to the United States, the first television program to cross the Pacific Ocean. In principle, three geosynchronous satellites located symmetrically in the plane of the earth's equator can provide complete coverage of the earth's surface. In practice, many more are used in order to increase the system's message-handling capacity. The first commercial geosynchronous satellite, Intelsat 1 (better known as Early Bird ), was launched by COMSAT in 1965. A network of 29 Intelsat satellites in geosynchronous orbit now provides instantaneous communications throughout the world. In addition, numerous communications satellites have been orbited by commercial organizations and individual nations for a variety of telecommunications tasks. Weather satellites, or meteorological satellites, provide continuous, up-to-date information about large-scale atmospheric conditions such as cloud cover and temperature profiles. Tiros 1, the first such satellite, was launched in 1960; it transmitted infrared television pictures of the earth's cloud cover and was able to detect the development of hurricanes and to chart their paths. The Tiros series was followed by the Nimbus series, which carried six cameras for more detailed scanning, and the Itos series, which was able to transmit night photographs. Other weather satellites include the Geostationary Operational Environmental Satellites (GOES), which send weather data and pictures that cover a section of the United States; China, Japan, India, and the European Space Agency have orbited similar craft. Current weather satellites can transmit visible or infrared photos, focus on a narrow or wide area, and maneuver in space to obtain maximum coverage. Navigation satellites were developed primarily to satisfy the need for a navigation system that nuclear submarines could use to update their inertial navigation system. This led the U.S. navy to establish the Transit program in 1958; the system was declared operational in 1962 after the launch of Transit 5A. Transit satellites provided a constant signal by which aircraft and ships could determine their positions with great accuracy. In 1967 civilians were able to enjoy the benefits of Transit technology. However, the Transit system had an inherent limitation. The combination of the small number of Transit satellites and their polar orbits meant there were some areas of the globe that were not continuously covered-as a result, the users had to wait until a satellite was properly positioned before they could obtain navigational information. The limitations of the Transit system spurred the next advance in satellite navigation: the availability of 24-hour worldwide positioning information. The Navigation Satellite for Time and Ranging/Global Positioning Satellite System (Navstar/GPS) consists of 24 satellites approximately 11,000 miles above the surface of the earth in six different orbital planes. The GPS has several advantages over the Transit system: It provides greater accuracy in a shorter time; users can obtain information 24 hours a day; and users are always in view of at least five satellites, which yields highly accurate location information (a direct readout of position accurate to within a few yards) including altitude. In addition, because of technological improvements, the GPS system has user equipment that is smaller and less complex. The former Soviet Union established a Navstar equivalent system known as the Global Orbiting Navigation Satellite System (GLONASS). The Russian-operated GLONASS will use the same number of satellites and orbits similar to those of Navstar when complete. Many of the handheld GPS receivers can also use the GLONASS data if equipped with the proper processing software. Beidou is China's satellite-based navigation and global positioning system. It began operations is 2011 with 10 satellites, succeeding an experimental system that became operational in 2001, and is planned to utilize 35 satellites when completed in 2020. Applications satellites are designed to test ways of improving satellite technology itself. Areas of concern include structure, instrumentation, controls, power supplies, and telemetry for future communications, meteorological, and navigation satellites. Satellites also have been used for a number of military purposes, including infrared sensors that track missile launches; electronic sensors that eavesdrop on classified conversations; and optical and other sensors that aid military surveillance. Such reconnaissance satellites have subsequently proved to have civilian benefits, such as commercially available satellite photographs showing surface features and structures in great detail, and fire sensing in remote forested areas. The United States has launched several Landsat remote-imaging satellites to survey the earth's resources by means of special television cameras and radiometric scanners. The data from remote-imaging satellites has also been used in archaeological research. Russia and other nations have also launched such satellites; the French SPOT satellite provides higher-resolution photographs of the earth. Bibliography See M. V. Fox, Satellites (1996); S. A. Kallen, The Giant Leaps: The Race to Space (1996); M. Long, 1997 Phillips World Satellite Almanac (1997); A. Luther, Satellite Technology: An Introduction (2d ed. 1997). Cite this article Pick a style below, and copy the text for your bibliography. (MORE)
GIS is Geographic Information Systems. Simply put,it is software used for mapping. It can ingest myriad types of data, satellite data being just one kind. GIS software like ArcMap does not NEED satellite data. So I suppose your answer is from zero to an infinite number.
The first communications satellites were simply metalized mylar balloons that could reflect radio signals that struck them. Being a couple of hundred miles from the surface, the satellite could be seen from widely-separated locations, and could be used as a mirror to relay radio between them. …The first live TV relayed in real time between Europe and the US via the Telstar satellite was a major big deal. Nowadays, communications satellites are fully-equipped repeater stations, with antennas, receivers, and transmitters that receive the uplink signal, clean it up, and retransmit it on the downlink, with everything powered by solar panels. (MORE)
Since photons are very light, a laser or some sort of directed light would provide very little actual thrust. There are hypotheses that a "solar sail" could be used to give small amounts of thrust for extended amounts of time to a space ship.
A satellite can be natural or artificial. An artificial satelliteis placed in orbit around the earth, moon, or another planet inorder to collect information or for communication. A naturalsatellite is a celestial body orbiting the earth or another planet.
It is a $4 billion system that was developed to connect calls around the world via 66 small satellites in low earth orbit
Microwave and satellite systems can be used to transmit audio, video, and other forms of data
Because satellites lack the geographic constraints of terrestrial systems, they are better suited for long-distance, point-to-multipoint transmissions such as television broadcasts
We don't need to protect our satellites because their is not yet warfare in space where our satellites are.
A satellite phone can be used practically anywhere. It does not require a cellphone tower, but instead a satellite, which are available all over the world. A satellite phone works in Antarctica, so you would probably be able to use it wherever you need to go.
Though now retired, the space shuttle was able to 'capture' satellites for repair and replace then in their correct orbit.
Mostly to study other planets and to find out about our solar system. They are used to take pictures of planets as well.
You can use a satellite phone where ever you have a clear view of the sky. New technologies are making it easier to use satellite phone even when your view of the sky is obstructed.
The many uses of Satellite Technology include: TV, Internet, Cell Phone, and Radio Services, to collect and send data to NASA and Weather Stations across the World, and uses for Military Communications Applications, such as Global Command and Control Systems.
well, natural satellites re moons like our moon so i'm don't exactly know what you would use it for .
Explorer 1 was the first US object to be launched into Earth Orbit January 31st, 1958.
a satilite is useful for reciving data and get information that they can use in the future or present.
They can see through clouds and work during the day and at night. They can also see changes in the soil, the vegetation, or snow, etc.
The service life of satellites in space depends on various factors. The most important one is Earth drag which pulls every object down to the ground. Its intensity depends on the altitude and the mass of the flying object (e.g. the ISS of about 450 tons (on the ground!) at 400 km is dragged down t…o Earth by 70 to 100 m every 24 hours). If you intend to keep a satellite on orbit (in use) you have to counter that drag, for which the satellites also have propellants on board. Since they are part of the precious payload at launch the amount of propellants is calculated for the estimated service life. With no re-boosts in altitude the satellite is bound to decay and not usable any more. For small satellites (like communication satellites) the amount of propellant is a few kilograms only (for minor re-boosts about 100 gram are needed only). The ISS is refuelled in regular intervals via Progress transporters (delivering more than 100 kilograms) and/or the rockets (and fuel) of docked spacecraft are used for re-boosts in order to save on-board fuel. (MORE)
The microwave has high enough frequency to carry the information and long enough wavelengths to penetrate the atmosphere. They are also easy to produce and easy to detect.
A satellite is used for establishing a connection with a third party, using a means of submitting binary code over a wavelength that can be sent through space, using an orbiting satellite dish to relay the information, and then have the information beamed back down to the receiver. This can be used… for various purposes ranging from internet, radio, and television use. (MORE)
Satellite technology uses a transponder to receive sings and then transfer them to satellites in other locations. They are used for purposes of space satellites and GPS.
A satellite system can be used for a variety of purposes. On the consumer market, it is mostly used for reception of television signals. It is also often used for broadband internet when there is no cable or ADSL available. When travelling in remote areas with no cellphone reception, it can also be …used for telephone calls. (MORE)
The Sky satellite is used to beam television signal around the world and into your satellite dish. Sky themselves use the Astra 2A satellite, which is fairly newly launched.
Satellites fly high in the sky, so they can see large areas of Earth at one time. Satellites also have a clear view of space. That's because they fly above Earth's clouds and air. Before satellites, TV signals didn't go very far. TV signals only travel in straight lines. So they would go off into s…pace instead of following Earth's curve. Sometimes they would be blocked by mountains or tall buildings. Phone calls to faraway places were also a problem. It costs a lot and it is hard to set up telephone wires over long distances or underwater. With satellites, TV signals and phone calls can be sent up to a satellite. The satellite can then send them back down to different spots on Earth. (MORE)
Well, without satellites and computers, different computer systems wouldn't be able to communicate in the first place. All the Internet is is a collection of numerous computers that transfer data from a source machine to a destination machine, which then retrieves the desired data and sends it back …to the machine that asked for it. (MORE)