顾及星间单差残差的GPS斜路径水汽含量估计

Estimate of GPS Slant-path Water Vapor Based on Single-differenced Residuals Between Satellites

摘要: 基于精密单点定位(precise point positioning,PPP)技术,对海上动态GPS斜路径水汽含量(SWV)估计进行研究。在现有计算方法的基础上,提出了顾及星间单差残差的SWV提取方法。利用渤海湾船载动态GPS测量数据和同步气象观测数据,对新方法的有效性进行了验证。结果表明,相对于MM5模式积分水汽结果,采用新方法计算的SWV值的RMS为1.2mm,比传统“非差残差法”减小了1mm。

Abstract: The estimate of marine kinematic GPS slant-path water vapor(SWV) is researched using Precise Point Positioning(PPP) technique in this paper.Based on the current study,this paper proposes a new method which takes into account the single difference residuals between satellites.The validity of this new method is verified by the comparison between the result of MM5 and that from the ship-borne kinematic GPS data.The result shows that the new method gives 1.2 mm RMS in SWV relative to MM5 result.That improves 1mm RMS in SWV compared to the current method.