Abstract: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.