Global Positioning System
Global Positioning System or GPS is better known as "a satellite based radionavigational system developed and operated by the U.S. Department of Defense (DOD). Global positioning system permits land, sea, and airborne users to determine their three-dimensional position, velocity, and time twenty-four hours a day, in all weather, anywhere in the world with a precise and accuracy far better than other radionavigation systems available today or in the foreseeable future." (Navcen) The Global Positioning System was designed for two services. One being, the Standard Positioning System and the other being the Precise Positioning System. Furthermore, space, control, and the user are all segments that consist of the Global Positioning System. Global Positioning System in my opinion is one the greatest inventions are government every designed, and as you will see the ability that GPS has for everyone. Global Positioning System provides two levels of service, the Standard Positioning Service, and the Precise Positioning Service. " The Standard Positioning Service or SPS is a positioning and time service which is available to all GPS users on a continuous, worldwide basis with no direct charge." (Tycho
Secondly, the Precise Positioning Service or PPS " is a highly accurate military positioning, velocity and timing service which is available on a continuous, worldwide basis to users authorized by the U.S. PPS is the data transmitted on GPS L2 frequency. Precise Positioning Service was designed primarily for U.S. military use. It is denied to unauthorized users by the use of cryptography. Precise Positioning Service is available to U.S. and allied military and U.S. Federal Government users."(Tycho) The PPS accuracy is 22-meters horizontal, 27.7-meter vertical, and 100 nanoseconds time. (Utexas) As you can see the PPS has better accuracy then the SPS since it was ultimately designed for government use only. Last of the three segments is the user. " The User Segment consists of the receivers, processors, and antennas that allow land, sea, or airborne operations to receive the GPS satellite broadcasts and compute their precise positions, velocity, and time." (Navcen) Users figure their position on the earth by measuring their distance from the group of satellites in space. The satellites are actually precise reference points. The measurements collected from the four satellites are processed to solve for the three dimensions of position, velocity, and time. (Tycho) As you can see, the three dimensions are the primary function of GPS. GPS receivers are made for aircraft, ships, ground vehicles, and for individual to carry by hand. Furthermore, GPS has also been used in the research of measuring atmospheric parameters, land surveying, Ge
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Approximate Word count = 1049
Approximate Pages = 4 (250 words per page double spaced)
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