Abstract: In the intersection measurement between theodolites with different precision, in order to improve the reliability and precision of the measure data, a position model and its error model are presented. A process method combined context independent variable behavior and weighted average is analyzed. The algorithm is simulated, the intersection angle area is calculated to judge whether context independent variable behavior algorithm or weighted average algorithm is chosen and applied in task. The result shows that the multi-theodolites with different precision system can increase measure baselines and improve the reliability with the decrease of measurement error effectively.

Key words: intersection measurement, triangulation measurement, 3D position estimation, photoelectric theodolite, data fusion