地形起伏对GPS工程控制网高程异常的影响

概要： CEN Min-yi1 FENG Yi-cong1 LU Bai-xiang1 LU Jian-kang2（1. College of Civil Engineering, Southwest Jiaotong University, Chengdu Sichuan, 610031; 2. The Second Railways Survey & Design Institute, Chengdu Sichuan, 610031）Abstract: The height anomaly can be separated into two components, , the short wavelength component and , the medium and long wavelength one. varies with topography greatly, especially in the mountain and high mountain area, while is relatively smoother. The accuracy of th

地形起伏对GPS工程控制网高程异常的影响,http://www.gczl8.com

摘  要：高程异常 由短波分量 和中长波分量 组成。 受地形起伏影响显著，特别是在山区和高山区，变化较大，而 的变化则相对比较平缓。利用DEM计算GPS控制点的 ，再结合移除-恢复技术，可以显著提高局部地区的GPS大地高转换为正常高的精度。本文就其核心问题 的计算进行了深入的研究，导出了连续型积分计算公式；分别试验了平原、丘陵、和高山地区在不同积分范围和不同参考面高程对 计算结果的影响，并分析了这些因素对GPS大地高转化为正常高的影响特点，由此得出一些有益的结论。

关键词：高程异常；正常高；全球定位系统；数字高程模型

中图分类号: P228　文献标识码: A

The Affection of the Rugged Topography on the Height Anomaly of GPS Engineering Control Network

ZHANG Tong-gang¹      CEN Min-yi¹   FENG Yi-cong¹      LU Bai-xiang¹       LU Jian-kang²

（1.  College of Civil Engineering, Southwest Jiaotong University, Chengdu Sichuan, 610031;

2. The Second Railways Survey & Design Institute, Chengdu Sichuan, 610031）

Abstract: The height anomaly can be separated into two components, , the short wavelength component and , the medium and long wavelength one. varies with topography greatly, especially in the mountain and high mountain area, while is relatively smoother. The accuracy of the height transformation of GPS height can be improved greatly in local mountain area by employing the remove-and-recover technique after of each GPS point calculated using DEM. We carefully study the kernel question, which is the calculation of the height anomaly caused by the rugged topography, and educe a continuous integral formula. Then, a series of experiments are designed for studying and analyzing the affection of scope of DEM involved in the integral process and the selection of the reference height. All of the experiments are performed in the plain, hill, and mountain areas respectively. After analysis of the results, some helpful conclusions are drawn by these tests.

Key words: height anomaly；normal height；GPS；DEM

 

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