active控件应用 GPS信号是靠接收天上的GPS卫星信号来的，由于GPS卫星不是地球的同步卫星，

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GPS信号是靠接收天上的GPS卫星信号来的，由于GPS卫星不是地球的同步卫星，因此其相对车辆的位置是一直变动的。所以，在某一时段（对不同地区，这个时段不一样），由于卫星的相对角度较小，容易受到车辆周围的建筑等遮挡物的屏蔽作用影响，从而导致接

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Packet : 车载GPS定位监控.doc filelist

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