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北斗和GPS反演大气可降水量的对比分析
段晓梅1, 曹云昌2
(1.内蒙古自治区气象信息中心;2.中国气象局气象探测中心)
Comparison of Atmospheric Precipitable Water Vapor Retrieved by Beidou and GPS
duanxiaomei1, caoyunchang2
(1.chengdu university of information technology;2.CMA Meteorological Observation Centre)
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投稿时间:2017-06-16    修订日期:2018-04-11
中文摘要: 摘 要:北斗地基增强系统是我国北斗卫星导航系统重要的地面基础设施,获取高精度、高时间分辨率的水汽产品,是数值预报、空间天气监测和预警业务的需求。本文利用2017年北斗地基增强系统中北斗单模、GPS单模和GPS+BD双模的数据资料,对同址的北斗气象站、GPS气象站和探空站反演大气可降水量进行对比分析,结果表明:(1)现行北斗地基增强系统所提供的数据,可以有效地用来反演大气柱总水汽含量,所得结果合理,平均偏差都小于1mm,在变化上与GPS系统和探空系统基本一致,对数值预报有一定的指示作用;(2)与GPS系统相比,GPS单模/PWV和GPS+BD双模/PWV的均方差小于2mm,相关系数均在97%以上,表明二者在反演PWV的精度上与GPS系统相当,而北斗单模/PWV的均方根误差为3mm-6mm,相对偏差达到了15%-20%,且相关系数不足95%,其精度与GPS系统还有一定的差距;(3)与探空相比,北斗单模在个别时次变化趋势上存在不一致的情况,其均方差为2.14-6.12mm,相对偏差为15.32%-20.84%,其误差可能是由于探测系统误差等因素造成的,而GPS+BD双模和GPS单模会更加稳定。
中文关键词: 北斗  地基增强系统  GPS  大气可降水量
Abstract:Abstract:The important infrastructure of the Beidou satellite navigation system is the Beidou Ground-based Augment System. The demand for numerical forecasting, space weather monitoring and early warning services is to obtain high precision and resolution water vapor products. In this paper, the data from three kinds of water vapor patterns of Beidou, GPS and GPS + BD in Beidou Ground-based Augment System, combined with the radiosonde observation, made detailed comparative analysis among Beidou, GPS and sounding system. The results show that: (1) The data provided by the Beidou ground-based augment system can be effectively used to retrieve the total vapor content of the atmospheric column, the average deviation is less than 1mm, which is basically consistent with the GPS and the sounding system, and has some indication of the numerical forecast. (2) Compared with the GPS system, the mean square error of GPS/PWV and GPS+BD/PWV is less than 2mm, and the correlation coefficient is more than 97%, which indicates that the accuracy is similar to GPS system. However, the mean square error of Beidou/PWV is 3mm-6mm, the relative deviation is 15% -20% and the correlation coefficient is less than 95%, which shows that there is a certain difference of accuracy between Beidou and GPS system. (3) Compared with sounding system, the Beidou/PWV has some inconsistent with the situation in the individual of time changes and its errors may be due to factors such as the detection system errors, while the GPS+BD/PWV and GPS/PWV will be more stable.
文章编号:201706160303     中图分类号:    文献标志码:
基金项目:国家重大科技专项
引用文本:
段晓梅,曹云昌,0.[en_title][J].Meteor Mon,():-.
duanxiaomei,caoyunchang,0.Comparison of Atmospheric Precipitable Water Vapor Retrieved by Beidou and GPS[J].Meteor Mon,():-.