卫星测高资料的电离层延迟改正交叉检验与误差分析
Cross-Calibration and Errors Analysis of Ionosphere Correction in Satellite Altimetry
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摘要: 对单频和双频卫星测高电离层改正进行了分析和比较。以Topex卫星双频电离层改正噪声影响为例,采用沿轨高斯低通滤波后,其交叉点不符值RMS可减小5.7～7.3mm。将平滑后的双频Topex电离层改正与DORIS模型、新发展的IRI2007同化模型和根据全球连续GPS跟踪站实测数据建立的GIM模型进行了交叉比较,结果表明,根据实测数据建立的DORIS和GIM模型精度高于IRI2007模型;与上述3个模型的差值统计结果还显示了平滑后的Topex双频电离层改正存在的10～15mm的系统偏差。Abstract: The single-and dual-frequency ionosphere corrections in satellite altimetry are analyzed in detail.Taking Topex dual-frequency ionosphere corrections as an example,RMS of cross-over difference can be reduced upto 5.7-7.3 mm by along-track filtering of low-pass Gauss.Then,the filtered Topex ionosphere corrections are cross-calibrated with DOIRS,IRI2007 and GIM models that are established by measurements of global continuous GPS tracking stations.The results show that the accuracy of DORIS and GIM is higher than that of IRI2007.The statistics of difference between the filtered Topex dual-frequency ionosphere correction and that from these models show a systematic bias of 10-15 mm.
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