Precise Point Positioning Ambiguity Resolution with Inter-Frequency Clock Bias Correction

Abstract:

This paper addresses the issue that inter-frequency clock bias （IFCB） affects the performance of triple-frequency undifferenced and uncombined precise point positioning ambiguity resolution （PPP-AR）. It proposes an epoch-differenced （ED） method to estimate IFCB for Global Positioning System （GPS）， Galileo Navigation Satellite System （Galileo）， and BeiDou Navigation Satellite System （BDS） satellites. It analyzes the time-varying characteristics of phase-specific IFCB （PIFCB） for these three satellite systems and evaluated the impacts of IFCB correction on extra-wide lane （EWL） uncalibrated phase delay （UPD） estimation for GPS Block IIF satellites and the performance of triple-frequency undifferenced and uncombined PPP-AR. The results demonstrate that the peak values of time-varying PIFCB series for GPS， Galileo， and BDS satellites are approximately 10 cm， 3 cm， and 5 cm， respectively. IFCB correction significantly improves the stability of EWL UPD estimation for GPS Block IIF satellites and enhances the performance of triple-frequency undifferenced and uncombined PPP-AR.

Key words:inter-frequency clock bias (IFCB);uncalibrated phase delay (UPD);precise point positioning;ambiguity resolution