Abstract：Indoor GPS (iGPS) is a newly developed laser based measuring system for large scale measurement. Since the synthesis uncertainties of the indoor GPS system provided by a triangulation network propagate from the uncertainties in the individual angular measurements, the first step in assessing the accuracy of the system is to determine the uncertainties of the horizontal angle and vertical angle. According to the indoor GPS measurement principle and the requirements of the indoor GPS angle calibration technology,combined with precision turntable, laser coaxial adjustment device and the vertical axis, the calibration device is developed. Measuring angle precision are calculated and analyzed. Experiments are then carried out to determine the actual uncertainty of the horizontal and vertical angle. Results show that horizontal angle measurement uncertainty is 1.5″, vertical angle measurement uncertainty is 0.9″, which satisfy the technical index.
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2013, Vol. 34 
