Figure 3

Time-frequency radar signatures measured in vegetation clutter and represented by: (a) spectrogram; (b) bicepstrum-based features (1); (c) bicepstrum-based features (2). The spectrogram is computed in the form of the amplitude of the short time Fourier transform (STFT), and the bicepstrum-based features are computed using IB (1) and DFB (2).