Figure 6From: GPS-R L1 interference signal processing for soil moisture estimation: an experimental studyPeriodograms and phase matching from higher antenna. The Lomb-Scargle periodograms and the phase matching results of satellites G1, G8, G11 and G17 from higher antenna before and after rainfall. (a) 21 to 26. (b) 20 to 22. (c) 6 to 2. (d) 15 to 30.Back to article page