triple difference phase observation
... 三边网trilateration network 三差相位观测triple difference phase observation 三杆分度仪three-arm protractor ...
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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.
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