Workspace Measuring and Positioning System is a new type of network measurement system based on the principle of multi-directional positioning of rotating planar laser beams. In order to trace the system accuracy, an angle measuring model was established and the uncertainty of single-station angle measurement was analyzed and tested. First, the formulas for azimuth and elevation of single-station were educed. Then, on the basis of error propagation characteristics, error sources were analyzed and the uncertainty of single-station angle measurement was estimated. Finally, the performance of azimuth angle measurement of single-station was verified by utilizing a manual indexing table to establish the reference angle, the type of which is DFT-720A. A regular polygon mirror and a collimator were used to adjust coaxiality and the influence of adjustment error on the experiment results was analyzed as well. It came out that the system azimuth angular uncertainty was about 2. 4" ( with the confidence probability of 99.73% ) , which is the precondition to realize high precision coordinate measurement.%空间测量定位系统是一种基于旋转激光平面进行角度交汇定位的新型网络式测量系统.为了对该系统进行严格的量值溯源,建立了测角模型,对系统单站测角不确定度进行了分析与验证.首先根据系统测量原理,推导出单站水平角和垂直角计算公式.然后在系统误差传递特性基础上,分析了测角模型中误差项的来源及影响,并对单站测角不确定度进行了估计.最后采用DFT-720A型号手动分度台作为角度基准,利用多面棱体和平行光管调整同轴度,对系统单站的水平测角不确定度进行了检定,分析了实验调整误差对检定结果的影响,实验结果表明该系统水平测角不确定度为2.4″(置信概率为99.73％),是实现高精密坐标测量的基础.
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