Measurement of the Characteristics of TIDs Using Small and Regional Networks of GPS Receivers during the Campaign of 17–30 July of 2008

Figure 4

Derivation of different parameters used by the SADM-GPS method for GPS satellites 13 and 25. Panels (a) and (e) show 𝐺_𝑡; (b) and (f) 𝐺_𝑥 solid curve and 𝐺_𝑥, dots; panels (c) and (g) show the direction of propagation 𝛼(𝑡); (d) and (h) present the horizontal velocity, 𝑉_ℎ(𝑡).