Figure 3
From: Sea level measurements using multi-frequency GPS and GLONASS observations
SNR measurements affected by multipath (left) and results from LSP analysis of the same data (right). The SNR measurements are recorded by the receiver connected to the zenith-looking antenna of the GNSS tide gauge. The signals are from the same satellite but for two different times, day-of-year (doy) 287 and 291, 2012. At doy 287, the sea level was lower (or the reflector height was larger) than for doy 291. This can be interpreted from the higher frequency of the multipath oscillations for doy 287, as compared to doy 291. The SNR data were then detrended and analyzed with an LSP showing clear peaks for reflector heights of 4.64 and 4.07 m for doy 287 and 291, respectively.