Abstract：In order to investigate the influence of GRACE-FO K-band ranging system and laser ranging interferometer on the time-variable gravity field model, during January 2019 to August 2021 the unconstrained 90 d/o monthly gravity field solutions APM_KBR and APM_LRI are derived by dynamic methods. In terms of degree variance from the gravity field model and the spatial distribution of equivalent water height, the accuracy of the two types of ranging data is at the same level under the condition of complete and good quality. However, satellite maneuvers or other satellite events in that month will lead to missing LRI data, resulting in a slightly lower signal-to-noise ratio of time series of the equivalent water height obtained by APM_LRI model in that month. From the perspective of post-fit residual, the RMS of APM_LRI is about 50% lower than that of APM_KBR, and the post-fit residual of LRI is significantly lower than that of KBR measurement at high frequency (≥60 CPR). In general, under the existing conditions, due to the influence of background models as well as other factors, the degree variance and the equivalent water height of gravity field from the two kinds of ranging data are basically the same, but the LRI ranging data has lower noise in the post-fit residual. In other words, LRI ranging data can be directly applied to detect and analyze tiny geophysical signals in the future.
ZHU Zitong,YAN Yihao,LIANG Lei et al. Comparative Analysis of Gravity Field Models of Microwave and Laser Ranging Data Based on GRACE-FO[J]. jgg, 2022, 42(12): 1262-1268.
