Abstract:In the large-scale three-dimensional coordinate measurement field, the double-theodolite coordinate measurement system is widely used due to its high accuracy, convenient station movement and non-contact measurement mode. To meet the requirement of industrial on-field large-scale measurement, two different theodolite system calibration methods are analyzed and realized based on the space forward intersection measuring principle by virtue of object oriented Visual C++ technique as well as the functions of computer-theodolite communication, coordinate measurement and basic geometric element fitting. The man-machine interface is also designed and the system data management is realized by means of ADO technology. The experimental results show that the coordinate measurement system is efficient, practical and high in accuracy which can be widely used in the industrial large scale coordinate measurement field.