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Global Positioning System Global Positioning System or GPS is better known as a satellite based radionavigational system developed and operated by the US 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 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 US PPS is the data transmitted on GPS L2 frequency Precise Positioning Service was designed primarily for US military use It is denied to unauthorized users by the use of cryptography Precise Positioning Service is available to US and allied military and US Federal Government usersTycho The PPS accuracy is 22-meters
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