对单个历元的双差载波相位观测方程进行零空间变换，避免了实时变化的三维位置参数求解；
It transforms the double-differential carrier observation equation using null space transformation so that it need not to resolve real-time three-dimensional position parameters.
在家委会和校领导沟通后，一年级没有拿到校历的班级很快拿到校历，虽然学期已经过半，而且很多活动只限双花园校区，但是有总比没有好！
Finally the first grade parents got the school calendars as well, although it's already mid-term, to have one is still better than none!
在家委会和校领导沟通后，一年级没有拿到校历的班级很快拿到校历，虽然学期已经过半，而且很多活动只限双花园校区，但是有总比没有好！
Finally the first grade parents got the school calendars as well, although it's already mid-term, to have one is still better than none!
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