Research on impacts of GPS carrier phase ambiguity resolution on receiver clock offsets

The impacts of global positioning system (GPS) carrier phase integer ambiguity resolution (IAR) on receiver clock offsets were analyzed．For that purpose，three sets of receiver clocks were computed from the GRACE-FO data based on un-difference float ambiguity resolution (FAR-UD)，single-difference IAR (IAR-SD)，and double-difference IAR (IAR-DD)．They were then assessed through comparison with the official clocks and in the overlaps． The results revealed that the standard deviations (STDs) of the relative clock differences between the computed and the official clocks were reduced notably by 48% and 60% for IAR-SD (17.2 ps) and IAR-DD (13.2 ps)，respectively，when compared to FAR-UD (32.8 ps)． The STD differences in the overlaps were reduced remarkably by 80% and 94% for IAR-SD (2.3 ps) and IAR-DD (0.7 ps)，respectively，when compared to FAR-UD (11.4 ps)，and the reductions were 36% and 81% when compared to those of official clocks．These results demonstrate that GPS carrier phase IAR can notably improve the relative clocks. © 2023 Huazhong University of Science and Technology. All rights reserved.