gps全球定位系统使用几颗卫星实现三维定位
gps卫星定位测量定位时,用户可以利用接收机的储存星历得到每个卫星的粗略位置。根据这些数据与自身位置,由计算机选择卫星与用户连线之间张角比较大的四颗卫星作为观测对象。
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