顾及GLONASS频间码偏差的非差精密时间传递性能评估OA

To investigate the impact of receiver IFCB on GLONASS undifferenced precise time trans-fer,different IFCB modeling schemes were proposed and their PPP time transfer performance was evaluated,namely the IFCB0 scheme ignoring IFCB,the IFCB1 scheme modeling IFCB as a linear function of frequency numbers,and the IFCB2 scheme modeling IFCB as a quadratic polynomial.The results indicate that IFCB modeling is of great significance for improving the accuracy of PPP time transfer.Compared to the IFCB0 scheme,the IFCB modeling approach demonstrates the most notable improvement in long-term frequency stability for time transfer.The IFCB modeling significantly en-hances time transfer stability for hybrid and heterogeneous receiver/antenna types,while its improve-ment for homogeneous equipment is limited.Additionally,compatibility tests with different satellite precision products show that the IFCB2 scheme aligns best with the precision products from the Euro-pean Orbit Determination Centre,whereas the IFCB1 scheme is more compatible with the precision products provided by Wuhan University.