掩星大气探测系统误差源分析

根据掩星大气探测反演原理，研究了影响系统产品精度的误差源，并对多普勒观测误差、天线相位中心变化误差、多路径误差、卫星质心变化误差、导航卫星钟飘、卫星姿态变化误差和精密定轨速度误差进行分析，根据工程实现可行性提出了系统误差分配建议，为掩星大气探测系统设计提供参考. 

Error Source Analysis of Atmospheric Occultation Sounding System

The error sources that influence the precision of atmospheric retrieval parameters obtained by the atmospheric occultation sounding system are studied. Each error which contributed to the total variance of the product was analyzed in detail, such as the Doppler observation error, the antenna phase center changing error, multipath error, the satellite centroid change error, the GNSS satellite clock drift error, satellite attitude variety error and the velocity error of precise orbit determination. The main errors that must be accounted carefully are the Doppler observation error, the multipath error, the antenna phase center changing error and the satellite attitude variety error. Especially if the distance between the satellite centroid and the occultation receiving antenna phase center is larger than 0.5m, or the satellite attitude variety is larger than 0.01(°) ·s-1, the error will become unacceptable. According to the implementation feasibility, the total error allocation scheme can offer a reference for the system design of atmospheric occultation sounding system.