线性工程控制网分级平差优化方法关键技术研究

Research on Key Techniques of Hierarchical Adjustment Optimization for the Linear Engineering Control Networks

采用控制网分级优化平差的方法,对狭长线性控制网进行了衔接工程控制点取值、不同解算精度基线的联合平差方法、导线边长改正对平差结果的影响等方面的研究,发现同名控制点在不同的衔接工程控制网解算结果存在一定的差异,不同解算精度的基线直接合并平差容易导致平差精度较低,导线边长改正对平差结果的影响与工程距离中央子午线的远近等因素有关,通过厦门仙岳高架控制网工程实例分析,提出了一级GNSS控制网与城市CORS站联测,以保证与衔接工程在空间基准的一致性,以及不同解算精度的基线进行分别定权后再优化平差等方案。

Using the method of grading optimization and leveling of control network to research some problems,such as the value of the connecting engineering control points of long linear control network,the joint leveling method for different solution accuracy baseline,and the influence of wire edge length correction on the leveling results.Found some differences in the calculation results of the same control points in different connection engineering control networks,direct consolidation of baselines with different solution accuracy easily leads to low leveling accuracy,the influence of wire edge length correction on the leveling result is related to the distance between the project and the central meridian.Through the case analysis of Xianyue elevated control network project in Xiamen city,proposes the joint test of the first-level GNSS control network and the urban CORS station to ensure the consistency with the connection engineering in the spatial benchmark,and the baseline of different solution accuracy is weighted separately and then optimized.