文章基本信息

标题：Effect of stochastic ionospheric delay modeling for GPS ambiguity resolution
其他标题：Effect of stochastic ionospheric delay modeling for GPS ambiguity resolution
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作者：Chang-Ki Hong ; Dorota A. Grejner-Brzezinska ; Jay Hyoun Kwon 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2009
卷号：61
期号：8
页码：e41-e44
DOI：10.1186/BF03352943
出版社：Springer Verlag
摘要：The network-derived ionospheric delay can improve the fast and accurate determination of the long baseline in both the rapid-static and kinematic Global Positioning System (GPS) positioning mode. In this study, an interpolation of the undifferenced (UD) ionospheric delays is performed on a satellite-by-satellite and epoch-by-epoch basis, respectively, using the least-squares collocation (LSC) to provide not only ionospheric delays but also their variances. The developed method retains the simplicity of the two-dimensional (2-D) model, but it does not introduce errors due to the thin-shell assumption made in the single-layered model. Our method also provides flexibility in forming the predicted double-differenced (DD) ionospheric delays. Faster and more reliable positioning solutions can be obtained when the developed method is used to predict DD ionospheric delays. The numerical test applying the method to the Ohio Continuously Operating Reference Station network shows a 23% improvement in mean time-to-fix with the network-derived ionospheric delays.
关键词：GPS positioning ;ionosphere modeling ;least-squares collocation ;CORS