海上移动平台GNSS可降水量反演影响因素研究

doi:10.3969/j.issn.1001-909X.2024.02.007

海洋学研究 ›› 2024, Vol. 42 ›› Issue (2): 71-80.DOI: 10.3969/j.issn.1001-909X.2024.02.007

海上移动平台GNSS可降水量反演影响因素研究

曹凯¹^,², 罗孝文¹^,²^,^*, 文崧²^,³, 尤伟²

1.山东科技大学测绘与空间信息学院, 山东青岛 266590
2.自然资源部海底科学重点实验室,自然资源部第二海洋研究所,浙江杭州 310012
3.成都理工大学沉积地质研究院,四川成都 610059

收稿日期:2023-11-07 修回日期:2024-01-23 出版日期:2024-06-15 发布日期:2024-08-09
通讯作者: 罗孝文
作者简介:*罗孝文(1972—),男,研究员,主要从事地球信息与探测技术方面的研究,E-mail: cdslxw@163.com。
曹凯(1999—),男,山东省临沂市人,主要从事GNSS数据处理方面的研究,E-mail: ck13791511873@163.com。
基金资助:
国家重点研发计划项目(2022YFC3003800);中央级公益性科研院所基本科研业务费专项资金资助项目(YJJC2401);浙江省财政一般公共预算资助项目(330000210130313013006)

Research on precipitable water vapor inversion influencing factors of GNSS for offshore mobile platforms

CAO Kai¹^,², LUO Xiaowen¹^,²^,^*, WEN Song²^,³, YOU Wei²

1. College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China
2. Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, MNR, Hangzhou 310012, China
3. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China

Received:2023-11-07 Revised:2024-01-23 Online:2024-06-15 Published:2024-08-09
Contact: LUO Xiaowen

摘要/Abstract

摘要：

基于海上移动平台GNSS动态精密单点定位技术(precise point positioning, PPP),对海洋上空可降水量(precipitable water vapor, PWV)探测的影响因素进行了研究,主要分析了采样间隔,卫星截止高度角,PPP解算方式(固定解或浮点解)以及有无北斗卫星系统组合对海洋PWV反演的影响。结果显示,采样间隔为30 s时,PWV反演的精度最高;可用卫星数较少的情况下,截止高度角设为5°~10°时,PWV反演精度更优,随着卫星截止高度角的增大,反演精度逐渐降低;定位解是否固定对PWV反演精度影响较小;在GPS/GLONASS系统组合的基础上,加入北斗卫星观测值,将提高观测的冗余度,有利于PWV反演精度的提高。

关键词: 海上移动平台, 精密单点定位技术(PPP), 北斗卫星(BDS), PWV, 影响因素

Abstract:

Based on Global Navigation Satellite System (GNSS) dynamic precision point positioning technology (PPP), the influence factors of precipitable water vapor (PWV) detection over the ocean were studied. The sampling interval, satellite masking angle, PPP solution method (fixed solution or floating point solution), and the influence of Beidou satellite system combination on ocean PWV retrieval were mainly analyzed. In the marine observation environment, the results show that the accuracy of PWV inversion is the highest when the sampling interval is 30 s. When the number of available satellites is small, the accuracy of PWV inversion is better when the satellite masking angle is set to 5°-10°, and the accuracy decreases gradually with the increase of the satellite masking angle. Whether the PPP solution is fixed or not, it has little effect on the accuracy of PWV inversion. On the basis of GPS/GLONASS system combination, adding Beidou observation value will improve the redundancy of observation and improve the accuracy of PWV inversion.

Key words: offshore mobile platform, precise point positioning (PPP), Beidou Navigation Satellite System (BDS), precipitable water vapor(PWV), influencing factors

中图分类号:

P228.49
P426

曹凯, 罗孝文, 文崧, 尤伟. 海上移动平台GNSS可降水量反演影响因素研究[J]. 海洋学研究, 2024, 42(2): 71-80.

CAO Kai, LUO Xiaowen, WEN Song, YOU Wei. Research on precipitable water vapor inversion influencing factors of GNSS for offshore mobile platforms[J]. Journal of Marine Sciences, 2024, 42(2): 71-80.

图/表 10

表1 PPP处理策略汇总表

Tab.1 Summary table of PPP processing strategy

参数	策略
处理模式	动态处理
卫星观测系统	GPS、GLONASS、BDS
观测值类型	伪距和载波相位
频率	GPS/GLONASS(L1,L2),BDS(B1,B2)
卫星天线相位中心改正	igs14.atx
接收机天线相位中心改正	igs14.atx
海潮改正模型	FES2004.BLQ
映射函数	GMF
相位缠绕改正	模型改正
相对论效应	模型改正
卫星轨道和钟差	wum最终产品
接收机钟差	白噪声
电离层模型	Ionosphere-Free-LC
对流层模型	参数估计
滤波	扩展卡尔曼滤波
模糊度固定方法	浮点解/固定解

图1 利用不同压力层计算的PWV值的对比图(a)以及PWV差值统计图(b)

Fig.1 The comparison of PWV values calculated by different pressure layers (a) and the corresponding difference statistics (b)

图2 不同采样间隔下的PWV反演值与探空站PWV计算值的对比

Fig.2 Comparison of PWV inversion values under different sampling intervals with those calculated from sounding radiosonde station

表2 不同采样间隔下的PWV反演值与探空站PWV计算值间的平均偏差及均方根误差统计

Tab.2 Statistics of the mean deviation and root mean square error between the PWV inversion values derived from different sampling intervals and those calculated from sounding radiosonde station

采样间隔/s	平均偏差/mm	均方根误差/mm
30	-2.36	6.34
60	-2.24	6.54
90	-1.72	7.10

图3 不同卫星截止高度角下的PWV反演值与探空站PWV计算值的对比

Fig.3 Comparison of PWV inversion values under different satellite masking angles with those calculated from sounding radiosonde station

表3 不同卫星截止高度角下的PWV反演值与探空站PWV计算值间的平均偏差及均方根误差统计

Tab.3 Statistics of the mean deviation and root mean square error between the PWV inversion values obtained under different satellite masking angles and those calculated from sounding radiosonde station

卫星截止高度角/(°)	平均偏差/mm	均方根误差/mm
5	-2.08	6.38
10	-2.36	6.34
15	-2.90	7.26
20	-3.42	7.53

图4 不同卫星截止高度角处理策略下的卫星可用数

Fig.4 The valid number of satellites under different satellite masking angle processing strategies

图5 不同PPP解算方式反演的PWV值与探空站PWV计算值的对比

Fig.5 Comparison of PWV inversion values derived from different PPP processing methods with those calculated from sounding radiosonde station

表4 不同PPP解算方式以及不同卫星组合反演的PWV与探空站PWV计算值间的平均偏差及均方根误差统计

Tab.4 Statistics of the mean deviation and root mean square error between the PWV inverted from different PPP processing methods and satellite combinations, and those calculated from sounding radiosonde station

方法	平均偏差/mm	均方根误差/mm
浮点解(GPS/GLONASS)	-2.36	6.34
固定解(GPS/GLONASS)	-0.71	6.27
固定解(GPS/GLONASS/BDS)	0.23	5.20

图6 不同卫星组合反演的PWV值与探空站PWV计算值的对比 (图中G/R表示GPS/GLNOASS卫星系统的组合,G/R/B表示GPS/GLONASS/BDS卫星系统的组合。)

Fig.6 Comparison of PWV inversion values derived from different satellite constellation combinations with those calculated from sounding radiosonde station (G/R represents the combination of GPS/GLONASS satellite systems, while G/R/B represents the combination of GPS/GLONASS/BDS satellite systems.)

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海上移动平台GNSS可降水量反演影响因素研究

Research on precipitable water vapor inversion influencing factors of GNSS for offshore mobile platforms

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