大气GPS掩星观测反演方法

Atmospheric inversion methods of GPS radio occultation

大气GPS掩星观测可获得全球的大气气象参量剖面信息.本文阐述了地球大气GPS掩星观测反演原理,详细介绍了其几何光学近似反演方法和全谱反演方法,提出了将几何光学反演方法和全谱反演方法结合以形成可以处理多路径掩星数据的反演新方案.该方案和几何光学反演方法应用于GPSMET和CHAMP大气掩星数据反演,成功地获得了大气参量剖面.结果表明,新反演方案是可行的、有效的GPS大气掩星反演方案.

GPS radio occultation is a new technique that explores the global atmosphere. Both the inversion methods of geometric optics and full spectrum inversion are described in details. The geometric optics method is a classic inversion method used before. The full spectrum inversion can deal with the multi-path propagation problem frequently occurred in the lower atmosphere for which the classic method usually becomes inefficient. A new inversion scheme which combines the geometric optics method and the full spectrum inversion method is proposed for atmospheric radio occultation inversion. It is applied to data processing with one GPS/MET radio occultation event data and one CHAMP event data, and successfully yielding atmospheric parameter profiles, which suggest the combined method is an efficient inversion scheme.