高海拔地区基于椭球膨胀法和GNSS技术建立地方坐标系的方法

The method of establishing local coordinate system based on ellipsoidal expansion and GNSS technique in high altitude area

对于基于椭球膨胀法和GNSS技术的独立坐标系投影计算进行研究,并对椭球长半轴变量△a的计算和取值及其对计算结果的影响进行分析。基于对△a的取值和影响分析,提出简化计算方法,介绍如何利用TGO软件进行计算,并与商用软件CosaGPS计算结果进行检核。通过已主持完成的测绘工程项目实例,完成了对分析结论的验证。研究成果对高海拔地区建立相对独立的地方坐标系具有参考价值。

The local independent coordinate system based on ellipsoid expansion method and GNSS technology is studied,and the change of ellipsoid long semi-axis variable△a and its influence on the calculation results are analyzed.Based on the value and influence analysis of△a,a simplified calculation method is proposed,and how to use TGO software to take the calculation is introduced,and the obtained results are checked with that of commercial software CosaGPS.Through real surveying and mapping engineering project,completed the verification of the conclusions.The research results are valuable for establishing relative local independent coordinate system in high altitude area.