一种适用大旋转角的GPS网三维平差方法

A method of GPS net adjustment for big rotating angel

在工程测量中往往采用工程坐标系,该坐标系坐标轴可能与GPS采用的WGS84坐标系的相应坐标轴间存在较大的旋转角,此时若仍直接按照一般方法进行三维约束平差计算会给结果带来不利影响,本文给出了一种适用大旋转角的GPS网三维平差方法,该方法能够很好地处理大旋转角时直接采用一般三维平差模型计算带来的不利影响,同时又能够获得平差后工程网中各点的点位精度。工程应用表明该方法非常有效,具有很好的应用价值。

Independent coordinates system is often used in engineering survey works, which may result in a big rotating angle between corresponding axes of independent coordinates system and the axes of WGS84 coordinates system. If we process data as a general way of three-dimensional adjustment as before, an adverse influence may occur. A method was proposed in this paper, which can resolve the problem successfully. At the same time it can obtain the position precision information of GPS points after net adjustment. En- gineering application in practice indicates that it is effective and valuable.