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

Kai Shai airport. The signal power for one receiving module is shown in Fig. 1; the darkvertical strikes at high altitudes are signatures of the airplanes, and those at low altitudesshow intensive ground clutter. Although the analyzed data set is untypical for CLR, it is veryuseful for testing SA data analysis techniques in the adverse measurement conditions.Figure 3. The vertical profiles of the easterly U and northerly V mean winds abovethe CLR on 19 June 2002 at 12:09 UT. Red crosses, DBS; blue bullets, STARS.The mean horizontal wind speed components U (toward east) and V (toward north) wereretrieved from the CLR signals in the SA mode with STARS and FCA methods at the sameaveraging time T av = 61.4 s, which is close to the DBS T av = 76.8 s. Three variants of FCA byFooks (1965), Meek et al. (1980), and Briggs (1984) were applied to the data. The best FCAresults using the Briggs (1984) technique are shown in Fig. 2, left column. The ordinate inthis figure is truncated; total scatter of the FCA results exceeds ±100 m/s. The poor FCAperformance for the analyzed data set is expected because CF-based techniques are stronglyaffected by noise with a large scale T n. The STARS-produced mean winds are in reasonableagreement with those produced by DBS when the latter does not fail. The agreement isillustrated further in Fig. 3; at this time interval DBS retrieved winds at most heights. Onecan see in Figs. 2 and 3 that the DBS performance is quite poor in spite of sufficiently highsignal-to-noise ratio; the latter varied from approximately 0 dB to 15 dB. The poor DBSperformance is expected in the presence of hard targets and strong ground clutter.Figure 4. The contour plots of the STARS-produced mean horizontal wind speed componentsabove CLR on 19 June 2003. Left, U ; right, V .At the same time, STARS produced plausible winds and turbulent intensity (not shown inthis paper) for all studied heights and times. The contour plots of the mean winds are shownin Fig. 4; one can see propagation of gravity waves in vertical and horizontal directions. The232