Time-delay Analysis for Dynamic Surveying of the laser total station measurement system for FAST

Five-hundred-meter Aperture Spherical radio Telescope (FAST), will be the largest radio telescope in the world. The dynamic surveying of the laser total station is one of the key technologies of FAST. So time-delay analysis for dynamic surveying is very essential for the building of FAST. One Leica laser total stations are employed to measure position of SMR. Laser tracker API is high-precision measuring device, and is used to monitor the spatial position of SMR in the real time. Two kinds of measuring data were sent to the same measurement computer, so these data have the same time-tag. Large numbers of experiment data were obtained, and there are many questions to be answered by this experiment. The delay time was found, the dynamic measurement precision of laser total station was test. The results of time-delay examination indicate that time-delay influence great the measurement and control precision. In spite of total station's dissatisfactory aspects, e. g. time-delay, sample rate, the total station measurement system can meet the requirement of the model. For higher precision, we need to take steps for eliminating time-delay. With the deepened of study, the laser total station will play an increasingly important part in the FAST.