基于斜轴圆柱投影的GNSS和地面测距联合平差研究

Research on Combined Adjustment of GNSS and Ground Ranging Based on Oblique Cylindrical Projection

利用斜轴圆柱投影方法可控制长线路施工控制网的投影变形,避免了多个高斯投影带导致的坐标转换烦琐、线路坐标衔接误差较大的难题,但其控制网短边的边长相对中误差不符合规范要求(大于1/150 000),为此,本文提出了对特定的控制网短边进行高精度地面测距,解决了基于斜轴圆柱投影的GNSS和地面测距联合平差问题,减小了短边边长相对中误差,并消除了大跨度控制网高斯投影的系统误差。

The oblique cylindrical projection method can be used to control the projection deformation of the long line construction control network,which avoids the problem of cumbersome coordinate conversion and large line coordinate connection error caused by multiple Gaussian projection belts,but the relative mean square error of the short edge of the control network does not meet the specification requirements(greater than 1∶150 000),so it proposes high-accuracy ground ranging for the short edge of the specific control network,solves the combined adjustment problem of GNSS and ground ranging based on oblique cylindrical projection,and reduce the relative mean square error of the short edge length.It eliminates the systematic error of Gaussian projection of large-span control networks.