28 / 2024-08-06 16:58:13

Accuracy validation of different system combinations for estimating regional UPDs AITC 2024+空天之星

UPD, PPP-AR, BDS, TTFF, GNSS.

The implementation of ambiguity resolution (AR) for precise point positioning (PPP) is of paramount importance to enhance the accuracy of positioning and to reduce the convergence time. Uncalibrated Phase Delays (UPD) represent a significant factor in the process of resolving ambiguities. The objective of this study is to investigate the differences in the performance of PPP with AR of UPD estimated by different combinations of satellite systems for 116 annual accumulation days in 2023. The results demonstrate that the regional UPD products of BDS and GLO, GAL three-system combinations in the Yunnan region exhibit enhanced stability and accuracy. The convergence time and accuracy of BDS-based single-system position estimation (UPD) in PPP-AR are not as favorable as those of other system combinations in certain periods. However, in the majority of periods, the UPDs estimated by different satellite-system combinations and single-BDS UPD did not exhibit a significant difference in positioning accuracy and convergence time in PPP-AR. One possible explanation for this discrepancy is that the UPDs estimated by different combinations of satellite systems exhibit smaller deviations from the UPDs in the majority of periods, which have a minimal impact on PPP-AR. Conversely, the deviations from the UPDs become more pronounced in individual periods, which negatively affects the positioning performance of PPP-AR.