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地形起伏對GPS工程控制網高程異常的影響

08-22 13:58:20  瀏覽次數:590次  欄目:工程測量
標簽:工程測量規范,工程測量技術, 地形起伏對GPS工程控制網高程異常的影響,http://www.tljciu.live

  要:高程異常 由短波分量 和中長波分量 組成。 受地形起伏影響顯著,特別是在山區和高山區,變化較大,而 的變化則相對比較平緩。利用DEM計算GPS控制點的 ,再結合移除-恢復技術,可以顯著提高局部地區的GPS大地高轉換為正常高的精度。本文就其核心問題 的計算進行了深入的研究,導出了連續型積分計算公式;分別試驗了平原、丘陵、和高山地區在不同積分范圍和不同參考面高程對 計算結果的影響,并分析了這些因素對GPS大地高轉化為正常高的影響特點,由此得出一些有益的結論。

關鍵詞:高程異常;正常高;全球定位系統;數字高程模型

中圖分類號: P228 文獻標識碼: 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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