小面积测区内直接采用gps坐标差的可行性研究.pdfVIP

第 36 卷 　第 2 期 西 　南 　交 　通 　大 　学 　学 　报 Vol. 36 　No. 2 2001 年 4 月 　　　　　　　 　　　　　　　 Apr. 2001 JOURNAL OF SOUTHWEST J IAOTONG UNIVERSITY ( ) 　　文章编号 2001 小面积测区内直接采用 GPS 坐标差的可行性研究 龚　涛 (西南交通大学土木工程学院 , 四川 成都 610031) 摘 　要 : 从理论上推证了 :对小面积测区 ,在确保一定精度要求的情况下 ,不作坐标转换 ,直接将地面上任意两 点在 WGS - 84 坐标系中的坐标差 ,视为北京 - 54 坐标系中对应两点的坐标差时 , GPS 网基线布设的有关问题; 并对我国范围内不同测区 GPS 网坐标变换的问题进行了计算分析 ,其结果可以作为建立 GPS 局部工程控制网的 参考。 关键词 : 坐标变换 ;大地测量 ;全球卫星定位系统 中图分类号: P288. 4 　　文献标识码 : A Feasibility of Directly Utilizing GPS Baseline Vectors in Local Engineering Networks GONG Tao ( ) School of Civil Eng. , Southwest Jiaotong University , Chengdu 610031 , China Abstract : Due to the difference between WGS - 84 and local or national reference systems , such as BJ - 54 (Beijing System of 1954) , coordinate transformation is necessary before GPS results are utilized for local engineering control. However , the transformation depends on the accurate national geodetic control points that are usually not enough or not available at all in an engineering field. The feasibility to directly utilize the GPS baseline vectors as the distances on the BJ - 54 coordinate without coordinate transformation is proved by computation analysis conducted through out China. The principles to determine the proper baseline vectors are studied and presented in detail. Key words : coordinat