Abstract
Choi et al. (2019) suggested that ionospheric total electron content (TEC) and receiver differential code bias (rDCB) stability have a strong correlation during a period of two years from 2014 to 2016. This article is a response to Zhong et al. (2020), who pointed out that the long-term variations of the GPS DCBs are mainly attributed to the satellite replacement rather than the ionospheric variability. In this issue, we investigated the center for orbit determination in Europe (CODE) Global Ionosphere Maps (GIM) products from 2000 to 2020. In this study, changes in TEC and receiver DCB (rDCB) root mean squares (RMS) at Bogota (BOGT) station still have a clear correlation. In addition, there was a moderate correlation between satellite DCB RMS and rDCB RMS. As a result, we suggest that rDCB can be affected simultaneously by GPS sDCB as well as ionospheric activity.
Highlights
Choi et al (2019) suggested that ionospheric total electron content (TEC) and receiver differential code bias stability have a strong correlation during a period of two years from 2014 to 2016
Choi et al [8] showed that ionospheric TEC and receiver Differential Code Biases (DCB) root mean squares (RMS) have a strong correlation during a period of two years from 2014 to 2016
They focused on the relation between receiver DCB (rDCB) stability and ionospheric activity rather than rDCB
Summary
Hz) rDCB plotted in and rDCB RMS during this period, we calculated band-pass filtered (0~0.05 Hz) rDCB RMS plotted. In CODE’s GIM products, the rDCB RMS values of the BOGT station in Figure 1a as a red solid line. In CODE’s GIM products, the rDCB RMS values of the BOGT station exist only from. Figure 1.filtered (a) Time (0~0.05Hz) series of vertical total electron contentcode (VTEC), band-pass The blue and green solid lines indicate(RMS). The blue and green solid lines indicate the of Global Ionosphere Maps (GIM)-TEC and band-pass filtered GIM-TEC, respectively. The red solid variations of Global Ionosphere Maps (GIM)-TEC and band-pass filtered GIM-TEC, respectively. The line indicates band-pass filtered rDCB RMS, taken from the bottom panel c). (b) Time series of GPS red solid line indicates band-pass filtered rDCB RMS, taken from the bottom panel c). Show the of rDCB of GPS rDCB2003 values blue dashed rectangles show thechanges changes of with ionospheric (c)activity
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