Global Positioning System (English: Global Positioning System, usually
referred to as GPS), also known as the global satellite positioning system. The
system was initially developed by the US government in the 1970s and fully
completed in 1994. Users only need to have a GPS receiver to use the service
without additional charges. GPS signals are divided into two categories:
Standard Positioning Service (SPS, Standard Positioning Service) for civilian
use and Precise Positioning Service (PPS, Precise Positioning Service) for
military regulations. Because SPS can be used arbitrarily without any
authorization, the United States originally added selective error (ie SA policy,
Selective Availability) to civilian signals to reduce its accuracy because it
was worried that hostile countries or organizations would use SPS to attack the
United States. , so that the final positioning accuracy is about 100 meters; the
accuracy of military regulations is less than ten meters. After 2000, the
Clinton administration decided to cancel the jamming of civilian signals.
Therefore, now civilian GPS can also achieve a positioning accuracy of about ten
meters.
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