Research On Measurement System Of Laser Total Stations For Large Radio Telescope

In pre-study of FAST(Five-hundred Meter Aperture Spherical Telescope), there are some disadvantages with Leica laser total stations,such as error,time lag and the instability of sampling interval in dynamic tracking measurement which bring many difficulties to tracking control of feedback.Therefore, the improvement of measurement accuracy is an important technical problem which is need to be solved.The main research works can be described as follows.1. This paper design a filter based on frequency analysis aimed at the measurement error in FAST.The experiment results prove that this filter has good filtering ability;2. This paper establishes the moving equations aimed at the moving characteristics of feedback supporting system in FAST.Based on the filter which this paper proposed,the filtering datas are forecasted.The experiment results prove the effect of the forecast datas;3. Through large radio telescope (LT) 5m model, the problem of 3-7mm data jump for leica laser total stations was occurred during the initial stages of dynamic tracking measurement. The cause of the problem was found through the experiments. The solution was provided and the experiments eliminated the data jump effectively. It provides reference for the future experiments.