多台激光跟踪仪测量数据平差的方差分量估计

基于多台激光跟踪仪观测数据进行高精度三维边角网平差,不可避免地需要对各类观测值进行定权.由于激光跟踪仪距离观测值和角度观测值精度差别较大,所以根据先验信息进行经验定权有-定局限性.本文根据各类观测值的特点提出了基于Helmet方差分量估计的方法进行验后重新定权和平差,并分析了平差原理和数据处理流程.通过四台激光跟踪仪对多个定向点进行实验测试,平差结果表明,相较于传统的经验定权方法平差,基于方差分量估计的方法平差解算定向点精度提高24.3%,控制网整体精度明显优于传统方法,验证了该方法的合理性.

It is inevitable to make weight determination for all kinds of observations when using multiple laser trackers observations for high -preeision three-dimension network adjustment. Beeause there are great differenees between distance measurement accuracy and angle measurement accuracy of laser tracker, there are some limitations when using prior information for experiment weighting. According to the characteristics of all kinds of laser traeker＇s observation, the method based on Helmert variance component estimation is put forward to make posterior weighting and adjustment, and analyze the adjustment principles and data processing procedure. Besides the multiple orientation points are tested using four laser trackers. The results show that the accuracy of adjustment computation orientation points is improved by 24.3% based on variance component estimation compared with traditional experiment weight, and the whole precision of control network is obviously better than that of control network established by the traditional method, which certifies the feasibility and reliability of the proposed method.