GNSS静态相对定位控制网同步环闭合差及重复基线较差限差研究

Study on Closing Error of Synchronization Loop and Difference Tolerance of Repeated Baselines in GNSS Static Relative Positioning Control Network

目前实际工程中,同步环坐标分量闭合差很难满足全球定位系统测量规范中的限差要求,而高速铁路工程测量规范中的同步环坐标分量闭合差限差又偏大,同时这两部规范所规定的同步环全长闭合差和重复基线长度较差限差也偏大。针对这一现象,本文基于基线解算完成后基线解算软件提供的方差协方差阵,推导了同步环坐标分量及全长闭合差限差和重复基线长度较差限差,并通过高速铁路某工程项目的CPII控制网的实测数据验证了上述限差的合理性。

In view of the fact that the closing error of the coordinate component of the synchronization loop is difficult to meet the error limitation in the global positioning system measurement specification in the actual project,and the closing error limitation of the coordinate component of the synchronization loop in the high-speed railway engineering measurement specification is too large.At the same time,the limitation of the total length closure error of the synchronization loop and the length difference of the repeated baseline specified in the two specifications are also too large.In view of this phenomenon,based on the variance covariance matrix provided by the baseline solution software after the baseline solution is completed,this paper deduces the synchronization loop coordinate component,the full-length closure difference limitation and the repeated baseline length difference limitation,and verifies the rationality of the limitation through the measured data of CPII control network of a high-speed railway project.