GPS卫星钟 GPS satellite clock

gps卫星信号 gps satellite signal

gps卫星星座 gps satellite constellation

gps卫星定位 gps satellite positioning ; gps satellite fixing ; gps global positioning

gps卫星钟 gps satellite clocks

GPS卫星时 gps satellite time

伪GPS卫星 pseudo GPS satellite

GPS卫星钟差 GPS Satellite Clock Bias