Optical-electronic Theodolite Calibration with Star in Range

Abstract

Optical-electronic theodolite is a primary measuring equipment of external trajectory.It's precision must be regularly calibrated in the course of use in order to meet the requirements of measuring tasks.The methods of optical-eletronic theodolite calibration in the range were studied.The course of measuring star was introduced,and the criterion of selecting star and the arithmetic of computing star theory were explained.The mathematic model was established after obtaining the measurement value of the star and the errors of the theodolite were calculated by using the least square method.At last,several factors of the calibration method with star were set forth.The computing results were checked by using factual devices.The result in range accorded with that of inner detection.It was showed that the calibration method with star in range was right.