峡谷地区GNSS网与边角网联合平差尺度一致性归算

Scale Consistency Reduction of Joint Adjustment of GNSS Network and Edge and Corner Nets in Gorge Area

峡谷地区布置较为集中的工程区域,短程精密测距精度总体优于GNSS测量精度,但其观测方向常存在较为严重的遮挡,需采用GNSS测量与全站仪边角测量,联合建立统一尺度的高精度工程测量控制网。采用一种基于区域GNSS与精密测距边长的尺度比估计方法,以精密测距边长为基准确定出合理的尺度比,从而实现GNSS成果与精密测距成果在尺度上的一致性,为联合平差提供了一种尺度高度一致的观测数据,使平差成果更加稳健。

The accuracy of short-range precision ranging is better than that of GNSS in the project area with more concentrated gorge area, but the observation direction may have serious occlusion. In this kind of project, it is suggested to combine the measurement of GNSS and the total station edge and angle to establish a high-precision engineering measurement and control network. It is necessary to unify the scale of joint adjustment and the key is to select the scale ratio reasonably. A scale ratio estimation method based on regional GNSS and precision edge length is used to determine the reasonable distance scale ration with nrecision distance side as the benchmark, that can achieve the scale consistency in GNSS results and distance measurement results, provide a scale of highly consistent observation results for project＇s joint adjustment and make adjustment results more robust.