利用VGOS与传统S/X加强型VLBI解算UT1-UTC的精度分析OA

To systematically evaluate the accuracy performance of the next-generation VLBI global ob-serving system(VGOS)in determining UT1-UTC,we process synchronous observation data from the 2024 VGOS-INT-A and traditional S/X-band IVS-INT-1 sessions using identical strategies,with the international IERS C04 series serving as the reference for accuracy assessment.The results indicate that,under identical station counts and geometric configurations,the number of observations per session for VGOS-INT-A(approximately 65)is significantly greater than that for IVS-INT-1(approximately 30).The weighted root mean square(WRMS)of the post-fit delay residuals for both systems is comparable.Regarding UT1-UTC solution accuracy,VGOS-INT-A demonstrates a clear advantage over IVS-INT-1,the RMS of its deviation with the C04 series is±0.046 ms,superior to the±0.060 ms of the latter.Its mean formal error is 14.26 μs,while that of IVS-INT-1 is 30.38 μs.Furthermore,preliminary analysis of data from China's VGOS stations shows good formal error(22.11 μs)and high stability in the solutions,although external agreement accuracy still lags behind international levels.This research provides quantitative evidence for the precision efficacy of VGOS technology in practical applications and highlights its potential for high-frequency Earth orientation parameter monitoring.