In the 1970s, Lu, Hai, and Air Force jointly developed a new generation of
global positioning systems. The main purpose of GPS was to provide real -time,
all -weather and global navigation services for Lu, Hai, and Air Force. After
more than 20 years of research experiments, such as more than 20 years of
research experiments, such as more than 20 years of military purposes, it cost $
30 billion. By 1994, 24 GPS satellite constellations with a global coverage rate
of 98%had been completed. GPS has gone through the first and second generation,
and now it has been upgraded to the third generation to maintain its hegemonic
position in the navigation positioning system. From the current point of view,
GPS is the most accurate and most widely covered navigation in the world.
GPS.
The initial GPS plan was formulated under the leadership of the United
States United Planning Agency, which placed 24 satellites on three orbits of
each other. There are 8 satellites on each orbit, and 6-9 satellites can be
observed on the earth. In this way, the coarse code accuracy can reach 100m and
the precision accuracy is 10m. Due to the compression of the budget, the GPS
plan had to reduce the number of satellite launch and changed to distributed 18
satellites on the 6 orbit of 600. However, this plan could not guarantee the
reliability of satellites. The last modification was carried out in 1988: 21
working satellites and 3 spare satellites worked on 6 orbits of 600. This is
also the current way of working in GPS satellite
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