Paper Info
Title
Investigation and Validation of the Time-Varying Characteristic for the GPS Differential Code Bias.
Abstract
The time-varying characteristic of the bias in the GPS code observation is investigated using triple-frequency observations. The method for estimating the combined code bias is presented and the twelve-month (1 January-31 December 2016) triple-frequency GPS data set from 114 International GNSS Service (IGS) stations is processed to analyze the characteristic of the combined code bias. The results show that the main periods of the combined code bias are 12, 8, 6, 4, 4.8 and 2.67 h. The time-varying characteristic of the combined code bias, which is the combination of differential code bias (DCB) (P1-P5) and DCB (P1-P2), shows that the real satellite DCBs are also time-varying. The difference between the two sets of the computed constant parts of the combined code bias, with the IGS DCB products of DCB (P1-P2) and DCB (P1-P2) and the mean of the estimated 24-h combined code bias series, further show that the combined code bias cannot be replaced by the DCB (P1-P2) and DCB (P1-P5) products. The time-varying part of inter-frequency clock bias (IFCB) can be estimated by the phase and code observations and the phase based IFCB is the combinations of the triple-frequency satellite uncalibrated phase delays (UPDs) and the code-based IFCB is the function of the DCBs. The performances of the computed the IFCB with different methods in single point positioning indicate that the accuracy for the constant part of the combined code bias is reduced, when the IGS DCB products are used to compute. These performances also show that the time-varying part of IFCB estimated with phase observation is better than that of code observation. The predicted results show that 98% of the predicted constant part of the combined code bias can be corrected and the attenuation of the predicted accuracy is much less evident. However, the accuracy of the predicted time-varying part decreases significantly with the predicted time.
Year
DOI
Venue
2019
10.3390/rs11040428
REMOTE SENSING
Keywords
Field
DocType
hardware delay bias,uncalibrated phase delay,GPS satellite clock,precise point positioning,inter-frequency clock bias
Remote sensing,Global Positioning System,Geology
Journal
Volume
Issue
Citations 
11
4
0
PageRank 
References 
Authors
0.34
0
3
Name
Order
Citations
PageRank
Haojun Li132.11
Jingxin Xiao200.68
Weidong Zhu333.47