激光跟踪仪精密测边网的建立与解算

Establishment and Solution of Precision Trilateration Network Based on Laser Tracker

由于激光跟踪仪基于激光干涉测距,其测距精度远高于测角精度,因此在局部布设高精度控制网时,可尽量避免角度观测值参与,仅利用距离观测值进行平差解算。建立精密测边网时,选用秩亏网自由网平差进行解算,同时正确计算未知参数近似值。试验数据表明,通过合理设置测站和待测目标点,可整体提高控制网精度,通过与激光干涉测距值对比,解算结果相对距离值精度优于5μm,验证了方法的正确性和有效性。

Because the laser tracker is based on laser interferometry,its accuracy is much higher than that of angle measurement.Therefore,when a high-precision control network is set up locally,the angular observation value can be avoided as much as possible,and only the distance observation value can be used to calculate the adjustment. When establishing the precision trilateration network,the adjustment of rank defect free network is used to solve the problem,and the approximate value of unknown parameters should be calculated correctly.The experimental data shows that the accuracy of the control network can be improved by reasonably setting the measurement stations and the target points.By comparing with the laser interferometer distance measurement result,the relative distance accuracy of the calculated result is better than that of 5 μm,and it indicates that the method is valuable andcorrect.