1957年,美国霍普金斯大学应用物理实验室的两位研究人员,在跟踪观测苏联发射的世界上第一颗人造地球卫星时,提出了一个设想:既然在地球上可以根据已知观测站的位置测出卫星在太空的位置,那么,反过来,利用已知卫星的位置也应该测出地面观测者的位置。几年之后,导航卫星诞生了。导航卫星利用从宇宙空间传来的无线电信号,自动完成一系列复杂的测量和计算工作,确定出军舰在海洋中的位置,并不断地引导军舰准确到达指定地 In 1957, two researchers at the Applied Physics Laboratory at Hopkins University in the United States came up with the idea of ​​tracking the first man-made earth satellite in the world launched by the Soviet Union: Since the Earth can be known from observational stations The location of the satellites in space, then, in turn, the location of the observers using the known satellites should also be measured. A few years later, the navigation satellite was born. Navigation satellites use radio signals from space to automate a series of complex measurements and calculations that determine the position of a warship in the oceans and constantly direct the warships to the designated place