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GPS是指全球定位系统,它由24颗地球人造卫星构成。这些卫星在距地球上方17700公里的太空中沿着6个不同轨道穿梭运行着。这种人造卫星上配备原子钟、计算机、接收机和发射机,它的工作原理是以每秒种1000次的发射速度在其所在位置不间断地发射信号,地面接收器通过测算每个信号的时间来确定所测位置与卫星之间的距离,从而确定所测物的经纬度和高度,精确度相当高。
GPS refers to the Global Positioning System, which consists of 24 earth satellites. These satellites shuttle in six different orbits in space 17,700 kilometers above the Earth. The satellite is equipped with an atomic clock, a computer, a receiver and a transmitter. It works by transmitting signals continuously at its location at a transmission rate of 1000 transmissions per second. The ground receiver measures the time of each signal To determine the measured position and the distance between the satellites, in order to determine the measured latitude and longitude and height, the accuracy is quite high.