不同定位模式下CGCS2000坐标确定及精度分析

阐述了ITRF参考框架向CGCS 2000坐标变换的基本原理,分析了速度场对转换精度的影响。通过比较不同定位模式下CGCS 2000坐标计算结果,证明了采用相对定位和绝对定位进行CGCS 2000坐标定位的可行性。试验结果表明:精密单点定位通过坐标转换可以达到与相对定位同等精度的CGCS 2000坐标;在转换过程中,测站速度的精度直接影响了CGCS 2000坐标的精度,在我国范围内可使用陆态网络提供的速度场模型进行转换。

Accuracy Analysis of Converting to CGCS2000 Coordinates in Different Positioning Mode

This paper expounds the basic principle of the ITRF reference frame to the CGCS2000 coordinate transformation,and analyzes the intluence of the velocity field on the conversion accuracy.By comparing the CGCS2000 coordinates in different positioning modes,it is proved that the relative positioning and absolute positioning of CGCS2000 coordinates are feasible.Experimental results show that the precise point positioning by coordinate conversion can be achieved with relative positioning of equal precision CGCS2000 coordinate;in the conversion process,station speed accuracy directly affects the accuracy of CGCS2000 coordinate,within the range of our country can use state land network to provide the speed field model transformation.