To an observer free of plate motion, ITRF velocity field is approximate.
对于不随板块运动的观察者，ITRF的速度场是近似的。
GPS satellite precise ephemerides provided by IGS describe there dimension position of GPS satellites in ITRF.
IGS提供的精密星历描述了GPS卫星在地固系中的三维位置。
The coordinate reference datum on which precision GPS survey is based, is ITRF International Terrestrial reference Frame that IERS offers.
高精度GPS测量所依据的坐标参考基准，是由IERS所提供的ITRF国际地球参考框架。
The coordinate reference datum on which precision GPS survey is based, is ITRF International Terrestrial reference Frame that IERS offers.
高精度GPS测量所依据的坐标参考基准，是由IERS所提供的ITRF国际地球参考框架。
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