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为研究工作空间测量定位系统的误差传递特性,建立了单发射站方位角/俯仰角测量模型及双发射站单元坐标测量模型。提出了以扫描角测量误差为基础的精度评价方法,通过分析扫描角与方位角/俯仰角之间的测量误差传递关系优化了激光发射站的几何结构。推导了双发射站单元坐标测量误差传递函数,并通过对坐标测量误差空间分布规律的分析求出了双发射站单元的最佳测量位置。使用两台发射站测量了某大型夹具顶端平台的位移,并通过与激光跟踪仪进行数据对比验证了所得结构。实验结果表明,当扫描角测量误差控制在5″以内时,双发射站系统可在5m×5m×3m的空间内实现优于0.25mm的精度。
In order to study the error propagation characteristics of the measurement positioning system in the working space, a single launch station azimuth / elevation measurement model and dual launch cell coordinate measurement model were established. The accuracy evaluation method based on the measurement error of the scan angle is proposed. The geometry of the laser transmitting station is optimized by analyzing the relation between the scan angle and the measurement error of the azimuth / elevation angle. The error transfer function of unit coordinate measurement of dual transmitting station is deduced, and the optimal measuring position of dual transmitting station unit is obtained by analyzing the spatial distribution of coordinate measuring error. The displacement of the top platform of a large fixture was measured by two transmitting stations and the obtained structure was verified by data comparison with the laser tracker. The experimental results show that when the measurement error of scanning angle is controlled within 5 ", the dual transmitting station system can achieve better than 0.25mm accuracy in the space of 5m × 5m × 3m.