ARTIFICIAL SATELLITE PPT
- 2. ABOUT SATELLITE (SLIDE 4 –SLIDE 7) –ABOUT ARTIFICIAL SATELLITE. LAUNCHING OF SATELLITE HOW SATELLITE WORKS WATER FOUND ON MOON BY ARTIFICIAL SATELLITE INDEX
- 3. Satellite A Satellite is a solid object which revolves around some heavenly body due to the effect of gravitational forces which are mutual in nature. We can categorize satellites in two types, namely Passive Satellites and Active satellites. A passive satellite can be further subdivided into two types, namely Natural satellites and artificial satellites. A moon is a natural satellite of earth. But spherical balloon with metal coated plastic serve as artificial satellites. Active satellites are complicated structures having a processing equipment called Transponder which is very vital for functioning of the satellite. These transponders serve dual purpose i.e. provides amplification of the incoming signal and performs the frequency translation of the incoming signal to avoid interference between the two signals.
- 4. 1957 First Artificial Satellite (Sputnik) The first artificial satellite was Sputnik 1, launched by the Soviet Union on October 4, 1957. At about the size of a basketball, Sputnik 1 was equipped with a radio transmitter that gave off a beeping signal—helping the Soviets to track it on its 98- minute orbit and to signal to the world that the U.S.S.R. was the leader in space
- 5. 1960 Photograph courtesy NOAA/NESDIS Headquarters First Orbiting Observations (TIROS-1 Weather Satellite) The first aerial images of the Earth from space were taken by TIROS 1 (Television InfraRed Observation Satellite). TIROS 1 was launched in 1960 to find out if it was possible to watch cloud cover and weather patterns from space. Although it was an experimental satellite, TIROS images were immediately put to use by meteorologists
- 6. 1972 First Surveying Satellite (Landsat) The first Landsat satellite was called the Earth Resources Technology Satellite, or ERTS. Since its launch on July 23, 1972, six Landsats have followed, with the latest, Landsat 7, lifting off on April 15, 1999. Over the years successive Landsats have not only carried better land-viewing sensors, but they have created a valuable archive of images that are being used to see how the land is changing over the years. Landsat 7 carries the Enhanced Thematic Mapper Plus, which scans the Earth in eight bands of visible and invisible light
- 7. 1974 First Geostationary Satellite (GOES) Best known as weather satellites, the first GOES (Geostationary Operational Environmental Satellite) was launched on October 16, 1975. Their high orbits and visible-light and infrared sensors allow for constant surveillance of weather patterns over the entire planet and have enabled GOES to revolutionize the science of weather prediction. GOES-10, launched in 1998, images the 48 contiguous U.S. states every five minutes.
- 8. Launching of Artificial Satellite To enable a satellite to orbit around any planet, we have to consider height from which the satellite must be thrown. Consider yourself, if you throw a stone, it comes to earth after some time, why? It is because of the gravitational attraction of earth and the stone. By the Newton 's law of gravitation, stone and earth would be attracted towards each other by force
- 9. How Satellites Work 1. A Earth Station sends message in GHz range. (Uplink) 2. Satellite Receive and retransmit signals back. (Downlink) 3. Other Earth Stations receive message in useful strength area. (Footprint)
- 10. Water discovered on moon by an indian satellite