文档介绍：外文资料及译文
全球定位系统
The principle of GPS
GPS
GPS(Navigation Satellite Timing and Ranging /Global Position System ),GPS clock and distance navigation system/global positioning systems, referred to as global positioning system (GPS), along with the rapid development of modern science and technology, and set up a new generation of satellite navigation and positioning system precision. Global positioning system (GPS) is in 1973 by . defense forces began anize, mon pletion in 1993. This system consists of space constellation, ground control and user receiver posed of three -1 GPS Satellite distribution
(一)Global positioning system
Space constellation
GPS space by 24 working part constellation spare satellite and three satellite. Work in 6 orbit satellite distribution within the surface. Each track surface distribution has 3 ~ 4 satellite, satellite orbits earth's equator Angle relative to the average height of 55, orbit for 20200 kilometers. Satellite operating cycle for 11 hours 45 minutes. Therefore, in the same station daily satellite layout is roughly same, just four minutes every day in advance. Each satellite about 5 hours every day in the horizon, located above the horizon of the satellite number with more time and place, at least 4 November, most. This layout can guarantee on earth at any time, any place can also observed above four satellites. Satellite signal transmission and reception and the influence, so the GPS is a global, all-weather real-time navigation and positioning for system. After pletion of the global positioning system, its work in the space distribution of satellite 1-1 as shown. GPS satellite zips are installed on the light, microprocessors, message signal emission equipment, storage, and provide power supply by solar cells have little fuel, satellite is used to regulate the satellite orbit and posture, and in the monitor of instruction, start spare satellite.
    The ground monitoring system
GPS ground monitoring