GPS控制网坐标系的设置及对导线精度的影响

Setup of GPS Control Net Coordinates and Its Effect on Traverse Accuracy

GPS测量得到的是WGS-84地心空间直角坐标,在工程施工中通常使用地方独立坐标系,WGS-84坐标与大地坐标和独立坐标可采用叶雪安两椭球坐标转换原理及平面或空间转换模型进行转换,但在某控制网工程测量中应用南方GPS软件进行数据处理,发现导线精度较差,对此,对GPS网两种坐标系下的二维基线平差结果进行了对比,对导线的平差结果进行了分析,得出使用GPS建立独立控制网应当使数据处理时的坐标系与后续使用常规手段加密控制网坐标系相一致。

What GPS measurement gets are WGS-84 geocentric spatial rectangular coordinates while what is used in engineering construction is generally local independent coordinates. The two coordinates can be mutually transformed by Ye Xue'an principle of two elliptic balls and by plane or spatial transformation models. However, it was found in the data processing using GPS software in a control net engineering measurement that the transverse had a poor accuracy. Therefore, the results of the error compensation of 2D base line of two kinds of coordinates in GPS net were compared and analyzed. It was concluded that in setting up independent control net by using GPS, the coordinates in the data processing should be made in conformity with that densified by conventional means.