| 船载GNSS探测海洋水汽信息的影响因子分析 |
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| 引用本文： | 陈冠旭,刘焱雄,柳响林,戴礼文,范士杰.船载GNSS探测海洋水汽信息的影响因子分析[J].武汉大学学报(信息科学版),2017,42(2):270-276. |
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| 作者姓名： | 陈冠旭 刘焱雄 柳响林 戴礼文 范士杰 |
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| 作者单位： | 1.武汉大学测绘学院, 湖北 武汉, 430079 |
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| 基金项目： | 国家自然科学基金Nos. 41374044, 41274011 |
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| 摘 要： | 利用船载全球卫星导航系统（global navigation satellite system，GNSS）方式探测海洋水汽含量，可丰富海洋水汽观测量和观测密度。利用印度洋航次试验实测数据，基于精密单点定位技术对海洋上空可降水份探测的精度问题进行了研究，主要分析了GNSS高程与可降水份之间存在的耦合关系，标定了动态GNSS的高程精度，分析了不同算法对可降水份估值的影响。结果显示:①固定解与浮点解、多系统与单系统对可降水份估算的影响不大，而不同软件、不同卫星星历和钟差产品对可降水份估算的影响较大，量级为2~4 mm；②高程与可降水份之间存在耦合关系，经初步估算，高程的均方根误差每增加24mm，则可降水份估值的均方根误差相应增加约1mm；③惯性测量单元垂荡值与精密单点定位高程结果之间的相关系数高达99%，二者的互差优于30mm，满足动态GNSS海洋水汽估计对高程精度的要求。
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| 关 键 词： | 海洋水汽 GNSS 精密单点定位 高程 可降水份 |
| 收稿时间： | 2016-02-03 |
Analysis on Influencing Factors of Ocean Water Vapor Estimated from Shipborne GNSS Measurements |
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| Institution: | 1.School of Geodesy and Geomatrics, WuhanUniversity, Wuhan 430079, China2.The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China3.School of Geosciences, China University of Petroleum(East China), Qingdao 266580, China4.Fugro Intersite B. V., Leidschendam 2263 HW, The Netherlands5.John Deere, Intelligent Solution Group, Torrance, California 90503, USA |
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| Abstract: | Using shipborne GNSS (global navigation satellite system) method to detect ocean water vapor content can rich the quantity and density of ocean water vapor observations. In this study, the specialized research using measured data from the Indian Ocean voyage experiment was conducted about the ocean precipitable water vapor (PWV) based on precise point positioning(PPP) technology, which mainly analyzed the coupling relationship between GNSS height and PWV, calibrated the height result accuracy of kinematic GNSS and analyzed the influence of different algorithms on PWV valuations. Main conclusions are as follows:①choices over the fixed ambiguity method or floated, multi-systems processing mode or single-system have small influences on the PWV estimation, but choices over different kinds of software and products of satellite ephemeris and clock have big influences, magnitude at 2~4 mm;②there is a coupling relationship between height and PWV, and a preliminary estimating shows that the PWV valuations root mean square (RMS) error increases 1 mm with the height RMS error rising about 24mm;③the height results of inertial measurement unit (IMU) and PPP have a high correlation that the correlation coefficient is as high as 99% and the magnitude of differences is better than 30mm, and then the accuracy requirements of height for ocean water vapor estimating based on kinematic GNSS is satisfied. |
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