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利用垂线偏差计算大地水准面中央区效应的改进方法

李厚朴1,边少锋2   

  1. 1. 海军工程大学 导航系702室
    2. 海军工程大学导航工程系
  • 收稿日期:2010-03-03 修回日期:2011-04-21 出版日期:2011-12-25 发布日期:2011-12-25
  • 通讯作者: 李厚朴

The Improved Method of Calculating the Geoid Innermost Area Effects Using Deflections of the Vertical

,Shaofeng Bian   

  • Received:2010-03-03 Revised:2011-04-21 Online:2011-12-25 Published:2011-12-25

摘要: 为提高利用Molodensky公式反演测高大地水准面中央区效应的精度,视中央区为矩形域,将垂线偏差分量表示成双二次多项式插值形式,引入非奇异变换,推导出了大地水准面的计算公式。垂线偏差理论模型下的分析表明本文导出公式误差为零,而传统公式的误差与纬度以及垂线偏差子午分量与卯酉分量之间的比值有关;以中纬度区域分辨率为2'*2'的垂线偏差数据为背景场进行了实际计算,结果表明在反演计算点本身所在的1个网格对大地水准面的贡献时,传统公式与本文导出公式计算结果差值的最大值达数厘米。本文导出公式可为测高大地水准面的高精度反演提供理论依据。

Abstract: In order to improve the precision of the innermost area effects in altimetry geoid computed by the Molodensky formula, deflections of the vertical were expressed as double quadratic polynomials regarding the innermost area as a rectangular one, and the formulae to calculate gravity anomaly of this area were derived after the non-singular transformation was introduced. The analysis based on the theoretical model of deflections of the vertical shows that these formulae’s errors are zero, and traditional formulae’s erros depend on the latitude and the ratio of the north-south deflection component to the west-east deflection component. A practical calculation was done based on deflections of the vetical data with a resolution of 2'*2' in the middle latitude area. The results indicate that the RMS differences between the contributions of the grid including the calculation point calculated by traditional formulae and this paper’s formulae are several centimeters. The formulae derived in this paper could provide theoretical basis for the recovery of altimetry geoid with high precision.