Swarm卫星星载GPS数据质量分析

摘要

从卫星可见性、DOP值、多路径误差、信噪比等方面对Swarm卫星星载GPS实测数据的质量进行分析,并将分析结果与GRACE卫星星载GPS数据质量进行对比.结果表明,Swarm卫星的多路径效应与伪距测量噪声比GRACE卫星大;DOP值两者基本相当;Swarm卫星接收机的通道数虽少,但是其跟踪能力强于GRACE卫星.最后,利用星载GPS数据进行Swarm卫星和GRACE卫星约化动力学定轨,表明Swarm卫星的伪距和载波相位残差均大于GRACE卫星.%The data quality of space-borne GPS for Swarm satellites is analyzed from the aspects of satellite visibility,DOP value,multipath error,SNR,and so on.The analysis results are compared with data quality of the GRACE satellite GPS.The results show that the multipath effect and the measurement noise of the pseudo-range for Swarm satellites are larger than those of the GRACE satellite,but DOP values are roughly equivalent for both satellites.Although the channel number of the Swarm satellite receiver is small,its tracking ability is stronger than that of the GRACE satellite.Finally,the reduced dynamics orbits for Swarm satellites and GRACE satellites are determined using GPS data,and the results show that the pseudo-range and carrier phase residuals of Swarm satellites are larger than that of GRACE satellites.