Figure 7
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Variations of the S4 index of satellite signals between the Zhuhai receiver and six BeiDou GEO satellites from 12 to 20 UT on April 3 (from 19:34 LT on April 3 to 03:34 LT on April 4, 2022). (a) The red star indicates the location of the ground-based GNSS receiver in Zhuhai. The blue dots represent the ionospheric pierce points at 250 km altitude for the six GEO satellites. (b)–(g) Variations of the S4 index for satellite signals.
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