卫星高度计电离层校正模型比较分析

雷达高度计电磁波穿过大气中的电离层时,会受到电离子的影响而发生延时现象,从而使高度计的测高数据产生误差,必须对其进行校正。基于Jason-1卫星高度计数据,比较分析了目前多种卫星高度计所采用的主流电离层校正模型:Bent模型、IRI95模型和IRI2007模型。从模型的分层、各层的算法及参数设置方面对3种模型进行了比较,并利用Jason-1卫星高度计的电离层双频校正算法数据对3种模型的校正结果进行了评价。研究发现,IRI模型优于Bent模型,IRI2007模型优于IRI95模型,尤其是在中国近海的中纬度地区IRI2007模型的校正效果最好。上述工作可为HY-2卫星高度计电离层校正的模型选择提供参考。

Analysis of the Ionosphere Correct Model for the Satellite Altimeter

When the electromagnetic wave of the satellite radar altimeter get through the ionosphere in the atmosphere,the spread time will be postponed by the influence of the ion,thus the altitude data of the satellite radar altimeter measured could cause an error,as to it has to carry on correcting.This paper compared the main ionosphere correction models for the satellite radar altimeter,including Bent model,IRI95 model and IRI2007 model.The pros and cons of Bent model,IRI95 model and IRI2007 model are analyzed from three different angles which are layering,the mathematic model of each layer and the parameter established respectively.This study shows that IRI model performs better than Bent model,IRI2007 is better than IRI95,particularly in the medium degree of latitude region,the correct result of IRI2007 model is the best,based on the data of Jason-1 altimeter.The study provides the reference for the model selection of Chinese HY-2 altimeter.