Cross Spectral Analysis of CODAR-SeaSonde Echoes from Sea Surface and Ionosphere at Taiwan

Figure 10

(a) Examples of range variations of the Doppler spectra of the first-order and second-order sea echoes. Note that the first-order spectral peaks locate at ±0.218 Hz. The top and middle panels are the Doppler spectra observed by the identical two loop antennas, and the bottom panel shows the Doppler spectra from monopole antenna. (b) Autospectra (top), cross spectra between different receiving channels (2nd panels), coherence spectra (3rd panels), and phase spectra (bottom panels) of the sea echoes for the data at range of 51.9 km presented in (a).

(a)

(b)