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GPS系统是由美国国防部设计和资助的精巧卫星导航系统,包含了24能持续发送地理位置海拔高度和时间信号的卫星,这些卫星平均分布运行在六个轨道上。一般来说,在地面上的GPS接收器能接收5～12个卫星信号,而为了获得地面上的定位坐标,至少需要4个卫星信号,三个用来确定GPS接收器的
The GPS system, a sophisticated satellite navigation system designed and funded by the U.S. Department of Defense, contains 24 satellites that continuously transmit geolocation altitude and time signals that run evenly across six orbits. In general, a GPS receiver on the ground can receive 5 to 12 satellite signals, and at least 4 satellite signals are needed to obtain the positioning coordinates on the ground. Three of them are used to determine the GPS receiver’s