非均匀分层对GNSS水汽三维层析的影响

针对目前地基全球卫星导航系统(GNSS)层析大气水汽精度不高的问题,本文提出对网格划分垂直方向非均匀分层的方法,提高了区域层析结果精度．基于多系统GNSS观测数据,对河南地区东经111.5°～115.5°,北纬33.6°～35.6°区域上空水汽分布进行层析探测,研究垂直分层方法对层析结果的影响,垂直方向采用均匀和非均匀两种分层方式,得到的水汽密度结果与探空反演水汽密度值都非常接近,对比来看,非均匀分层层析在相关系数、均方根误差和平均偏差等数据分析方面表现出了较好的数据精度,采用非均匀分层方法可以得到更优的大气水汽反演结果. 

Effect of non-uniform layering on 3D water vapor chromatography of GNSS

In view of the current low-precision accuracy of ground-based GNSS tomographic water vapor, this paper proposes a method for non-uniform stratification of the vertical direction of the mesh, which improves the accuracy of the regional tomographic results. Based on multi system GNSS observation data, the water vapor distribution over the area of 111.5～115.5° east longitude and 33.6～35.6° north latitude in Henan Province is detected by tomography, and the influence of vertical stratification method on the chromatographic results is studied. The vertical stratification method adopts uniform and non-uniform stratification methods, and the results of water vapor density are very close to those of sounding inversion. By contrast, the non-uniform tomographic data analysis shows good data accuracy in correlation coefficient, root mean square error and mean deviation. The non-uniform stratification method can obtain better atmospheric water vapor inversion results.