高海拔地区GPS控制边长投影变形处理方法

Method for GPS Control Network Length Distortion of Projection in High Altitude Area

GPS控制测量边长投影变形是工程控制网中经常遇到的难题之一,高海拔地区的投影变形较大,会影响工程后续施工放样精度。本文分析了GPS控制测量投影变形产生的原因,探讨消除和减小边长投影变形的数据处理方法。在光伏电厂控制测量工程中实验结果表明:边长尺度约束法和椭球膨胀法可以合理的处理GPS控制网的边长投影变形。

GPS control network length distortion of projection is one of the frequently encountered problems in engineering control network,in high altitude area distortion of projection affect the accuracy of construction lofting. In this paper, the causes of the projection deformation of GPS control measurement are analyzed, data processing method to eliminate and decrease the length distortion of projection are discussed. In the solar PV plant the experimental results : The length scale constraint method and ellipsoid expansion method can reasonable control length distortion of projection, to achieve the goal of improving the accuracy of plane control network.