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你知道GPS吗?GPS(Global Positioning System)即全球卫星定位系统,是美国国防部自 20世纪60年代起,用20年耗资100亿美元研制开发的一种高精度卫星导航系统,由空间卫星网 (图1、图2)、地面控制站(图3)和用户设备三大部分组成。GPS利用位于距地面2万多千米、由24 颗人造卫星(图4)组成的卫星网,向地球不断发送定位信号。地球上的任何一个GPS接收机(图5), 只要收到3颗以上卫星发出的信号,瞬间就可以计算出被测物的运动状态,如经度、纬度、高度、
Do you know GPS? The Global Positioning System (GPS) is the global satellite positioning system. It is a high-precision satellite navigation system developed and developed by the US Department of Defense since the 1960s in 20 years at a cost of 10 billion U.S. dollars. (Figure 1, Figure 2), ground control station (Figure 3) and user equipment consist of three parts. GPS uses a satellite network consisting of more than 20,000 kilometers from the ground and consists of 24 satellites (Figure 4) to continuously send positioning signals to the earth. Any GPS receiver on the earth (Figure 5), as long as it receives signals from more than 3 satellites, can instantaneously calculate the motion state of the measured object, such as longitude, latitude, altitude,