A modified carrier-to-code leveling method for retrieving ionospheric observables and detecting short-term temporal variability of receiver differential code biases

• Published in: Journal of geodesy Vol. 93; no. 1; pp. 19 - 28
• Main Authors: Zhang, Baocheng, Teunissen, Peter J. G., Yuan, Yunbin, Zhang, Xiao, Li, Min
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.01.2019; Springer Nature B.V
• Subjects: By-products; Earth and Environmental Science; Earth Sciences; Geodetics; Geophysics/Geodesy; Global positioning systems; GPS; Ionosphere; Methods; Original Article; Parameter estimation; Positioning systems; Temporal variability; Temporal variations; Vertical total electron content (vTEC); Global positioning system (GPS); Modified carrier-to-code leveling (MCCL); Receiver differential code bias (rDCB); Ionosphere
• ISSN: 0949-7714; 1432-1394
• DOI: 10.1007/s00190-018-1135-1

Sensing the ionosphere with the global positioning system involves two sequential tasks, namely the ionospheric observable retrieval and the ionospheric parameter estimation. A prominent source of error has long been identified as short-term variability in receiver differential code bias (rDCB). We modify the carrier-to-code leveling (CCL), a method commonly used to accomplish the first task, through assuming rDCB to be unlinked in time. Aside from the ionospheric observables, which are affected by, among others, the rDCB at one reference epoch, the Modified CCL (MCCL) can also provide the rDCB offsets with respect to the reference epoch as by-products. Two consequences arise. First, MCCL is capable of excluding the effects of time-varying rDCB from the ionospheric observables, which, in turn, improves the quality of ionospheric parameters of interest. Second, MCCL has significant potential as a means to detect between-epoch fluctuations experienced by rDCB of a single receiver.