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or GPS is better known as "a satellite based radionavigational system developed and operated by the U.S. Department of Defense (DOD). 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 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 . in my opinion is one the greatest inventions are government every designed, and as you will see the ability that GPS has for everyone.
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) The SPS is provided on the L1 frequency, which then will code a navigational message. The SPS accuracy is 100-meter horizontal, 156-meter vertical, and 340 nanoseconds time, and in total the SPS is ninety-five percent accurate. (Utexas) The Department of Defense also degrades this service so those consumers can use this service.
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.
Another system of is the three segments. The first is the Space segment. "The space segment consists of 24 operational satellites in six circular orbits 20,200 km above the earth at an inclination angle of 55 degrees with a twelve hour period. The satellites are spaced in orbit so that at any time a minimum of 6 satellites will be in view to users anywhere in the world. The satellites continuously broadcast position and time data to users throughout the world." (Navcen) These satellites send radio signals from space to earth so that we can read the correct data.
The next is the control segment, which is main part of this operation for this to work. The control segment consists of five Monitor Stations, and they are in Hawaii, Kwajalein, Ascension Island, Diego Garcia, and Colorado Springs. There are also three ground antennas located in Ascension Island, Kwajalein, and Diego Garcia. The Master Control Station is located at Schriever Air Force Base in Colorado. (Utexas) " The Monitor Stations passively track all satellites in view, accumulating ranging data. This I information is processed at the Master ...
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