GPS And How It Works

12/02/2011 14:06

GPS symbolizes Global Positioning System, a sat nav system with twenty-four satellites in orbit. These satellites were set up by the United States Department of Defense for military uses, and were called NAVSTAR. The earliest satellite was launched in 1978 plus the twenty-fourth and last satellite was finally into position in 1994. In 1980 NAVSTAR was made available to the general public for commercial use.

GPS works 24 / 7 in any weather. The satellites orbit the world twice a day in a specific orbit that is about 12,000 miles above us. In orbit, the satellites travel you desire 7,000 miles per hour. As they are orbiting, they transmit information to receivers on the globe. The receivers use this information to calculate the user's location. This calculation is created by determining the real difference between the time a transmission was made and when the receiver received it. Your particulars are often used to calculate the distance and the position is displayed on the receiver.

For a receiver to calculate a latitude and longitude position is usually to receive information from three satellites. To calculate latitude, longitude and altitude a receiver should be able to receive information from four or even more satellites. After position is known the GPS might tell the user more knowledge about speed, trip distance, the distance to a desired destination, sunrise and sunset times, bearing as well as other information.

While in orbit, the satellites are powered by power from the sun. They also have backup batteries which might be used in the event of no solar such as an eclipse. The energy is used to power small rockets for the satellites that have them in the proper orbit. At any one time only about 50 watts of power or less can be used to transmit information. The satellites are meant to last about several years, and the U.S. Department of Defense is actually making and launching replacement satellites. Each satellite is all about 2,000 pounds and seventeen feet across if your solar panels are out.

GPS receivers are typically accurate within 15 meters. Rather than investing in a receiver there won't be any fees or other equipment forced to access the GPS signal. If very accurate readings will be required, Differential Global Position Systems (DGPS) will provide accuracy within 3-5 meters. The United States Coast Guard operates the favourite DGPS.

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Two power signals are transmitted and are also referred to as L1 and L2. The L1 frequency can be used for civilian purposes. These signals are relatively low power signals and travel by distinct sight, so they can move through clouds, glass, and plastic, although not solid objects like buildings or mountains. In every transmission the satellite sends three kinds of information, its pseudorandom code, ephemeris data and almanac data. The pseudorandom code can be an I.S. code that identifies which satellite the info is being sent from. Ephemeris data tells the receiver in which the satellite should be without notice of the day, and almanac data sends more knowledge about the status of the satellite, the current date plus the time. The almanac stats are the part that is essential for determining the user's position.