Proceedings with Extended Abstracts (single PDF file) - Radio ...

poor. It was shown that poor performance of SA and DBS methods at low SNR is due tointermittent non-white noise in the MUR signals of yet unknown origin. This problem can betreated, for example by excluding noisy records from data analysis during incoherentaveraging of records.Figure 1. Time series of the easterly U and northerly V mean wind speed componentson 24 April 2002 at z o = 5.1 km (left column) and 10.05 km (right column).Red crosses, DBS; blue bullets, STARS; green circles, HAD.Figure 2. Time series of turbulence characteristics on 24 April 2002 at z o = 5.4 km (leftcolumn) and 10.35 km (right column). See Figure 1 for the legends.Characteristics of turbulence were retrieved from the MUR signals in SA mode with STARSand HAD techniques at the averaging time T av = 78.6 s, while the spectral width wasestimated in DBS mode at T av = 58.4 s. The beam broadening corrections led to numerousnegative values of σw, and the uncorrected spectral width is presented below. Hereafter u, v,and w denote the turbulent velocity components of a scattering medium in the easterly,northerly, and vertical directions, and the standard deviation of the components are denotedas σu, σv, and σw, respectively. The STARS and HAD-produced values of σware in goodagreement although the STARS results are systematically smaller than the HAD results byapproximately 20%; typical time series are shown in Fig. 2. The spectral width is much larger153