The Space point measurement repeatability is a prerequisite for achieving high-precision measurements to tracker, so it is important to Spatial positioning accuracy. Different measurement object means different error propagation model. In this paper, we research on the tracker measure a fixed point in a manner such single point, which according to model arrangement, under controlled conditions. Experimental measurements from three different perspectives just as different distances, different horizontal and different Vertical angle. From the integrated angle error, the repeat single point measurement accuracy is given. Then establish of a single point evaluate model that combine with algorithm.
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