Abstract
A SODAR uses atmospheric turbulence backscatter from several narrow inclined beams to estimate turbulence and wind profiles. Simple averaging-over-range and averaging-over-frequency schemes have been used in some SODAR systems, but generally code techniques are problematic because of the high fractional Doppler shift of 0–0.04. Results are given of detailed simulations, using weather-like targets, of a sequenced comb of frequencies, a chirp, and phase-encoding methods. Three Doppler-adaptive matched filters are described and evaluated against the simulated noisy atmosphere. It is found that the comb of frequencies produce the least variance in estimated Doppler wind speed, and under expected typical turbulence levels, the filter should provide Doppler winds to about 1%. These methods are evaluated in a compact SODAR configuration, with the emphasis on extracting high spatial resolution data over the lowest 20–40 m altitude. This height range has applications in pollutant and agricultural investigations.
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