顾及河流流向的GNSS-R流速反演  

GNSS-R velocity inversion considering river directions

作　　者：关昕 柯福阳 王萍[3] 黄炜[3] 郝建强 周勃[5] 刘淼[3] 包瑾 林宜旻 王笑蕾 GUAN Xin;KE Fuyang;WANG Ping;HUANG Wei;HAO Jianqiang;ZHOU Bo;LIU Miao;BAO Jin;LINYimin;WANG Xiaolei(School of Remote Sensing and Geomatics Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;Wuxi Research Institute,Nanjing University of Information Science and Technology,Wuxi,Jiangsu 214000,China;Jiangsu Province Hydrology and Water Resources Investigation Bureau,Nanjing 210000,China;Nanjing China-Spacenet Satellite Telecom Co.,Ltd.,Nanjing 210061,China;Shanghai Spaceflight Institute of TT&C and Telecommunication,Shanghai 201109,China;School of Earth Sciences and Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]南京信息工程大学遥感与测绘工程学院,南京210044 [2]南京信息工程大学无锡研究院,江苏无锡214000 [3]江苏省水文水资源勘测局,南京210000 [4]南京中网卫星通信股份有限公司,南京210061 [5]上海航天测控通信研究所,上海201109 [6]河海大学地球科学与工程学院,南京211100

出　　处：《导航定位学报》2024年第5期132-138,共7页Journal of Navigation and Positioning

基　　金：2022年度江苏省水利科技项目(2022004)。

摘　　要：针对传统的河流流速测量方法存在价格昂贵、维护困难或不准确等问题,提出一种顾及河流流向的GNSS-R流速反演方法:指出河流流向和反射几何构型会对GNSS-R流速反演造成影响,并利用GNSS信号相对反射面运动产生的多普勒效应进行流速测量;然后引入声学多普勒流速剖面仪(ADCP)实测数据对反演结果进行验证,分析不同几何构型下,散射效应对于多普勒频移的影响,并完善GNSS-R河流流速反演方法。实验结果表明,后向构型时,反演的河流流速值一般大于前向构型;基于后向构型的多普勒频率差对河流流速进行反演的结果与实测流速值变化趋势相近,但由于多普勒频率难以准确捕获的原因,反演中误差较大。Aiming at the problems of high costs,maintenance difficulties and inaccuracies in traditional measurement methods of river flow velocity,the paper proposed a method of global navigation satellite system-reflectometry(GNSS-R)velocity inversion considering river directions:it was pointed out that the river flow direction and scattering geometry would affect the GNSS-R velocity inversion,and the Doppler effect generated by the movement of GNSS signals in relation to reflecting surfaces was used for flow velocity measurement;then,the measured data of acoustic Doppler current profiler(ADCP)was introduced to verify the inversion results,and the influence of scattering effect on Doppler frequency shift under different geometric configurations was analyzed;finally,the GNSS-R flow velocity inversion technology was improved.Experimental results showed that in the backward configuration,the flow v elocity would be generally higher than that in the forward configuration;moreover,the inversion results based on the Doppler frequency difference of backward configuration would be similar to the measured flow velocity,but the error could be large because the Doppler frequency is difficult to capture accurately.

关 键 词：全球卫星导航系统反射测量(GNSS-R) 流速测量 散射几何构型 河流流向 多普勒频率 

分 类 号：P228[天文地球—大地测量学与测量工程]