| Popis: |
The performance of several time-frequency distributions were compared using a test signal, which represented a pulse-echo signal from seven point targets. By moving from the spectrogram to other time-frequency distributions, we have shifted from a tradeoff in axial and lateral resolution to a tradeoff in axial resolution, lateral resolution, and cross-term level. The smoothed pseudo-Wigner distribution gave the best overall results most likely because it has the most available parameters. Cross-terms were present at low levels. Axial and lateral resolutions approached those of the Wigner distribution. |
