Global Positioning System or GPS for short, is the world's first satellite radio navigation system. This was developed by the U. S. Department of Defense under the name of leaving or satellite navigation and timing began. Research on planning and satellite navigation to start operating in 1960 and the first GPS satellite was launched in 1978. But it was not until April 27, 1995 which became fully operational. At first they were primarily used for navigation and positioning troops and artillery fire. Er in the year 1980 the U.S. government on the orders of the executive power for civilian use.
The GPS System is made up of three main elements, Satellites, Earth Monitoring Stations and GPS Receivers. Presently there are 24 satellites circling the earth in 6 orbits. Each satellite circles the earth twice a day traveling at approximately 7000 miles per hour. At their highest point they orbit about 12,600 miles above the earth s surface. At this height the signals from each satellite can be picked up over a large area of the earth s surface. This is important since it offers at least four signals that can be picked up by your GPS receiver. The more signals used to pin point your location the more accurate your reported location will be. Working with the satellites are five monitoring stations located on earth. Four of these stations are unmanned and the fifth is a manned master station which is located in Colorado Springs, Colorado. The four unmanned stations constantly receive position data from the satellites and send it on to the master station. The information received by the master station is used to correct the position of the sat tiles and then sends that corrected information back to the satellites. All of this occurs so that the third element your GPS unit receives accurate data from the satellites it is receiving signals from at any particular moment. Your GPS unit then takes this information and reports to you by signal and screen information your exact location.
Signals sent from the GPS satellite system power radio signals Nature. Their signals as leading mobile phone signals. This means they passed through clouds, glass and plastic but not through the established media, such as buildings, in basements, caves, etc. also affect the weather of GPS signals, but not enough to affect the received signal quality GPS units. From GPS satellites circle the earth, their signals can be picked up and used around the world. There are no fees or costs required to start using the GPS satellite system.
Your GPS unit to work counting the time it takes to receive signals from each of at least three satellites compare with all the information they report via satellite and then to identify his strategy of triangulation and location of your position.
It is possible to receive signals from three satellites to your position in latitude and longitude to report or track the movement. However, when your GPS unit can receive signals from at least four satellites to calculate the 3D position. That is, can report your position and the latitude, longitude and altitude of a. While this information will your unit is not only able to report the position and movement, but can report your speed, trip distance, distance to destination, and many more.
Accuracy of the GPS unit depends on its ability to receive and hold fast to the above, or lock in on, the GPS satellite signal. The ability to maintain a lock on the signal power when the GPS unit into the grass or the urban environment and how tall buildings and dealing with the weather as snow and thunderstorms depend on features designed in your unit. S are generally more expensive units will have an average accuracy of 30-40 meters. GPS units are much more than just the cost of the satellite signal pickup, restore them again to improve the accuracy of only a few feet down.
