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。
The single- and dual- frequency ionosphere corrections in satellite altimetry are an- alyzed 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.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2012年第6期658-661,共4页
Geomatics and Information Science of Wuhan University
基金
国家863计划资助项目(2009AA121402)
国家自然科学基金资助项目(41004007
41074014)
地球物理大地测量国家测绘地理信息局重点实验室开放基金资助项目(10-02-08)
