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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2~4mm;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。
The detection of ocean water vapor content using the global navigation satellite system (GNSS) method can enrich marine water vapor observations and observation densities. Based on the data from the Indian Ocean Voyage Test, the precision of the detection of precipitable water over the sea is studied based on the precise single-point positioning technique. The coupling between the GNSS elevation and the precipitable water is analyzed, and the elevation accuracy of the dynamic GNSS , Analyzed the impact of different algorithms on precipitable water valuation. The results show that: 1 fixed solution and floating point solution, multi-system and single system have little effect on the precipitable water estimation, and different software, different satellite ephemeris and clock products have a greater impact on precipitable water estimation, 2 ~ 4mm. There is a coupling relationship between elevation 2 and precipitable water. After a preliminary estimation, the root mean square error of the precipitable water valuation increases by about 1mm for each 24mm increase in RMSE. 3 Inertial measurements The correlation coefficient between unit heave value and precise single-point positioning elevation is as high as 99%, the mutual difference between them is better than 30mm, which meets the requirement of dynamic GNSS ocean water vapor estimation for elevation accuracy.