Research on application of GPS elevation fitting in existing orbital elevation survey
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摘要: 实时动态（RTK）技术的应用对于提高既有轨道勘测效率具有重要意义. 目前,针对传统水准测量效率低且由于高程误差,GPS-RTK尚不能替代传统水准测量手段的问题,提出了一种自动化二次曲面拟合模型,研究不同间隔控制点条件下的高程拟合精度. 为此,在试验现场分别获取同点位系列的内外轨RTK及水准测量高程数据,分析了基于RTK的轨面GPS高程测量数据应用可行性及处理方法. 结果表明,在引入一定控制点条件下,在500 m间隔内采用自动化二次曲面模型拟合后得到的GPS高程数据可较好地满足既有线勘测要求.Abstract: The application real time kinematic technology is significant for improving the efficiency of the existing track survey. At present, in view of the low efficiency of traditional leveling and the fact that GPS-RTK can not replace traditional leveling methods due to elevation error,a method of plane fitting and quadric surface fitting is proposed to study the accuracy of elevation fitting under different interval control points. Therefore, the real-time kinematic (RTK) and leveling elevation data of inner and outer rails in the same position series are obtained at the test site, and the feasibility and processing method of GPS elevation measurement data based on RTK are analyzed. The results show that,under the condition of introducing a certain control point, the GPS elevation data obtained by using quadric surface fitting can meet the requirements of the existing cable survey within the 500 m interval.
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