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Alternative TitleUsing One-Dimensional Variational Assimilation Algorithm to Obtain Atmospheric Refractive Index from Ground-Based GPS Phase Delay
谢衍新1,2; 吴小成1
Source Publication武汉大学学报. 信息科学版
Keyword地基GPS 相位延迟 一维变分同化 折射率 折射修正
AbstractGPS信号相位延迟中包含很多大气信息,通过一定的方法可以从中获取有价值的大气参数.基于地基GPS相位延迟数据,提出了一种结合经验模式的一维变分同化获取大气折射率的方法.利用GPS相位延迟模拟数据进行同化试验,讨论了背景误差的设置对同化结果的影响,采用实测个例对该方法进行了验证.结果表明,该一维变分同化方法可行,并可获取高精度的0~ 60 km大气折射率.低层大气背景误差设置的准确程度会对整个高度范围内的同化效果产生影响.首次将同化获取的大气折射率应用于无线电波折射修正,取得了很好的修正效果,修正精度可达1 mm量级.
Other AbstractGPS phase delay contains a lot of information that can be used to obtain atmospheric parameters with certain methods. Based on ground-based GPS phase delay,a one-dimensional variational (1DVAR) assimilation algorithm combined with an empirical model is proposed to obtain the atmospheric refractive index. The assimilation experiment is carried out by using simulated GPS phase delay data,and also verified with actual measured data. The influence of the background error settings on the result of assimilation is discussed. The experimental result shows that the 1DVAR assimilation algorithm can get high-precision atmospheric refractive index in 0-60 km height. The background error settings of the lower layers can affect the assimilation result in the whole height range. The atmospheric refractive index obtained from the assimilation experiment is used to correct the radio wave refraction,and the result is very good,which can reach 1 mm scale correction accuracy.
Indexed ByCSCD
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Document Type期刊论文
Affiliation1.中国科学院国家空间科学中心, 北京, 100190;
2.中国科学院大学地球科学学院, 北京, 100049
Recommended Citation
GB/T 7714
谢衍新,吴小成. 利用一维变分同化方法从地基GPS相位延迟中获取大气折射率[J]. 武汉大学学报. 信息科学版,2018,43(7):1042-1047.
APA 谢衍新,&吴小成.(2018).利用一维变分同化方法从地基GPS相位延迟中获取大气折射率.武汉大学学报. 信息科学版,43(7),1042-1047.
MLA 谢衍新,et al."利用一维变分同化方法从地基GPS相位延迟中获取大气折射率".武汉大学学报. 信息科学版 43.7(2018):1042-1047.
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20184371042-1047.pdf(6293KB)期刊论文出版稿开放获取CC BY-NC-SAApplication Full Text
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