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| 1 | GNSS对流层水汽监测研究进展与展望显示文摘对流层是近地空间环境中与人类活动联系最为密切的大气层,而水汽是低层大气圈中最重要的组成部分之一。尽管水汽在对流层中所占比例较小,但在一系列天气和多种气候变化中都扮演着重要角色。随着全球导航卫星系统(GNSS)的快速发展,GNSS对流层水汽监测成为重要的研究和应用方向。本文系统介绍了GNSS多维水汽监测及其在相关方面应用的研究现状和进展。GNSS水汽监测研究方面,当前主要集中在二维大气可降水量监测和三维湿折射率/水汽密度廓线反演两部分;GNSS水汽应用研究方面,当前主要包括定位、短临降雨及旱涝监测、数值同化预报等。 | 姚宜斌 赵庆志 | 2022 | 测绘学报2022，51，6： | 10 |
| 2 | Soil moisture estimation based on BeiDou Bl interference signal analysis显示文摘BeiDou Navigation Satellite System reflectometry(BDS-R) is an emerging area of BD(BeiDou) applications that uses multipath reflected signals in microwave remote sensing.Soil moisture estimation is one of the potential important applications of BDS-R.This study aims to investigate the feasibility of soil moisture estimation based on BD B1 band interference signals,which are composed of direct and reflected BD signals and can be readily captured using low-cost commercial BDS receivers.In this paper,a theoretical background for soil estimation from interference signals was introduced,and an analysis of field experimental data was conducted.First,a cosine model for the interference signal power was built,and a non-uniform power spectrum analysis was performed on the received interference signals to determine its main frequency.Then,a least squares curve fitting was applied on the interference signal power to extract its phase.The relationship between the soil moisture and the phase was then determined.Two months of experimental data were collected at BaoXie,Wuhan and analyzed for further inversion.Experimental results show that the phase of the interference signals increases with the increase of soil moisture.The correlation coefficient between the phase and the in-situ soil moisture value is approximately 0.8.Finally,the relationship between the phase and soil moisture is employed to estimate soil moisture.Results show that using BDS-R to measure soil moisture is feasible,which demonstrates a great potential of new application of the BD system. | YAN SongHua ZHAO Fen CHEN NengCheng GONG JianYa | 2016 | Science China(Information Sciences)2016，59，12： | 3 |
| 3 | 箭载GPS定位临近地面卫星对流层延迟改正模型显示文摘针对经典对流层延迟改正模型无法处理负仰角卫星误差修正的问题,在传统球对称标准大气模型的基础上,采用射线描迹法建立了GPS信号穿透对流层的数学模型,推导了根据对流层折射最低点海拔高度计算对流层延迟改正的计算公式;为求解对流层折射最低点海拔高度,采用最小二乘法求得GPS信号穿透对流层时地心张角与最低点海拔高度之间的线性方程,提出了根据卫星和火箭之间的夹角与地心张角之间的关系进行迭代计算,进而求得最低点海拔高度的方法;最后引入了模型误差因子,评估对流层延迟改正模型的效果。采用火箭飞行试验数据对模型进行验证,结果表明,该模型提供的方法能够消除负仰角卫星大部分对流层延迟,消除的最大延迟可达135 m,消除对流层延迟后的临近地面卫星参与定位计算使最终定位精度提高25 m,计算迭代次数平均10次,尤其适合箭载GPS实时定位。 | 饶爱水 李清梅 胡健 吴关鹏 | 2015 | 中国惯性技术学报2015，23，5： | 2 |
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