What is GPS

What is GPS and How. MyYoutube :  My Bloger
Global Positioning System [1] or GPS (English: Global Positioning System: GPS) is a positioning system on the Earth’s surface.
By calculating the frequency of the clock signal sent from a satellite orbiting around the Earth’s position. This system can be positioned at the point where you can not get a signal around the world.
The GPS receiver can calculate the new speed and direction used in conjunction with the map. For use in navigation.
Concept in the development of the GPS system. Starting from 1957, when American scientists led by Dr. Richard B. Kershner.
Followed the Sputnik satellite by the Soviet Union. And the Doppler effect of the radio waves transmitted by satellites. If they were aware of the exact location on the earth’s surface.
You can specify the location of the satellite measurements of Doppler’s. If you know the exact location of the satellite. You can specify the location on the earth in return.
U.S. Navy experimented with satellite navigation systems TRANSIT is the first name on the 1960, it consists of five satellites, satellites used in the GPS system.
(GPS Block-I) held on the first trial in 1978 for military use.
After the events of 1983, when Korean Air Lines Flight 007 flight strayed into South Korean airspace of the Soviet Union shot down and killed all 269 passengers.
President Ronald. Reagan announced that When the GPS system was completed. To allow the general public to use.
GPS satellites. The satellite orbit with (Medium Earth Orbit: MEO).
At an altitude of about 20,200 kilometers (12,600 miles or 10,900 nautical miles) of the Earth is confirmed by the position coordinates of the satellite at least 4 satellites.
Satellite will orbit the earth for 12 hours per cycle at speed 4 km / s. Each orbital plane can have a 6 to 4 satellites at an angle 55 degrees.
The whole system has to be 24, one or more satellites to be able to confirm the position of any point on the Earth’s surface is covered by current satellite GPS Block-II.4-6 reserve satellites around it.
From Wikipedia. States.

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