Weather Radar Polarimetry by Guifu Zhang

Author:Guifu Zhang
Language: eng
Format: epub, pdf
Publisher: CRC Press

(5.77)

where M is the number of samples in the dwell time; V1 is the time series of voltage samples from the first scan; and V2 is the down-sampled time series of voltage samples from the second scan from the same volume but collected at a higher pulse repetition frequency (PRF).

FIGURE 5.10 Probability density functions of cross-correlation coefficients between two scan signals for clutter, zero weather, and weather, respectively. (From Li, Y., et al., 2013b. IEEE Transactions on Geoscience and Remote Sensing, 51, 2373–2387.)

Because the correlation time for ground clutter is typically much longer than that for weather signals, ρ12 is expected to be much larger for ground clutter than for either weather signal (w or w0). Figure 5.10 shows the PDFs of for clutter, zero weather, and weather signals. As expected, clutter has, in general, a much larger ρ12 than that of weather, and the overlap area between weather and clutter in the PDF plot is less than 31%. Hence, the scan-to-scan correlation provides useful information for detecting clutter from weather echoes.

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