顾及边界信号及垂直约束的GNSS水汽层析方法

doi:10.11947/j.AGCS.2021.20200433

测绘学报 ›› 2021, Vol. 50 ›› Issue (7): 853-862.doi: 10.11947/j.AGCS.2021.20200433

• 大地测量学与导航 • 下一篇

顾及边界信号及垂直约束的GNSS水汽层析方法

何秀凤, 詹伟, 施宏凯

河海大学地球科学与工程学院, 江苏南京 211100

收稿日期:2020-09-10 修回日期:2021-02-05 发布日期:2021-08-13
通讯作者: 詹伟 E-mail:mrzhan1996@163.com
作者简介:何秀凤(1962-),女,教授,研究方向为GNSS定位技术与应用,InSAR技术和变形监测。E-mail:xfhe@hhu.edu.cn
基金资助:
国家自然科学基金（41830110）；国家重点研究发展计划（2018YFC1503603）；国家自然科学基金青年基金（42004008）；江苏省自然科学基金青年基金（BK20190498）；南京市2020年留学人员科技创新项目择优资助（B2004804）；国家留学基金（201306270014；202006710169）

A GNSS water vapor tomography method considering boundary signals and vertical constraint

HE Xiufeng, ZHAN Wei, SHI Hongkai

School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China

Received:2020-09-10 Revised:2021-02-05 Published:2021-08-13
Supported by:
The National Natural Science Foundation of China (No. 41830110);The National Key Research and Development Program of China (No. 2018YFC1503603);The Youth Foundation of National Natural Science Foundation of China (No. 42004008);The Youth Foundation of Natural Science Foundation of Jiangsu Province (No. BK20190498);The Preferential Subsidy for Science and Technology Innovation Projects of Overseas Students in Nanjing in 2020 (No. B2004804);The State Scholarship Fund from Chinese Scholarship Council (Nos. 201306270014;202006710169)

摘要/Abstract

摘要： 利用GNSS三维水汽层析技术获取大气水汽分布信息，具有全天候、高时空分辨率、高精度和经济实用的优势。但目前只考虑层顶信号的层析模型，存在观测数据利用率低、网格空格率大的问题，此外采用的垂直约束方程与实际水汽分布符合程度也较低。本文基于探空信息拟合的函数建立垂直约束，设计并实现了一种顾及边界信号的层析方法，利用香港CORS网数据和无线电探空产品进行精度验证，详细分析了边界信号对层析结果的改善程度，同时分析了垂直约束方程对层析结果的影响。研究结果表明：边界信号的加入使得观测量提高了51.9%，网格空格率大幅降低，解算结果的平均均方根误差降低了12.1%；相对于基于垂直方向上水汽分布呈指数递减特性建立的传统约束方程，本文采用的垂直约束解算结果的平均均方根误差降低了5.7%。

关键词: GNSS, 三维水汽, 层析, 边界入射信号, 垂直约束, 无线电探空数据

Abstract: GNSS three-dimensional water vapor tomography technology is used to obtain all-weather atmospheric water vapor distribution information with high spatial and temporal resolution. At present, the observation data of the tomographic model considering only the top signal have low utilization rate and large grid space rate, and the vertical constraint equation adopted is less consistent with the actual water vapor distribution. This paper based on the function fitted with sounding information to establish a vertical constraints, designs and implements a tomographic method considering boundary signals, uses the observation data of Hong Kong CORS network and radio sounding products. The improvement of the results of water vapor tomography by introducing boundary signals and for vertical constraint equation are analyzed in detail. The results show that the addition of boundary signals increases the observation equation by 51.9%, decreases the grid space rate significantly, and reduces the root-mean-square error of the solution results by 12.1%. Compared with the traditional constraint equation based on the exponential decline characteristic in the vertical direction, the root-mean-square error of the vertical constraint solution adopted in this paper is reduced by 5.7%.

Key words: GNSS, 3D water vapor, tomography, boundary incident signals, vertical constraint, radiosonde data

中图分类号:

P228

何秀凤, 詹伟, 施宏凯. 顾及边界信号及垂直约束的GNSS水汽层析方法[J]. 测绘学报, 2021, 50(7): 853-862.

HE Xiufeng, ZHAN Wei, SHI Hongkai. A GNSS water vapor tomography method considering boundary signals and vertical constraint[J]. Acta Geodaetica et Cartographica Sinica, 2021, 50(7): 853-862.

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顾及边界信号及垂直约束的GNSS水汽层析方法

A GNSS water vapor tomography method considering boundary signals and vertical constraint

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