Abstract
The combination of acoustic and radio waves called RASS (Radio Acoustic Sounding System) allows ground based measurements of the vertical profiles for temperature, wind and turbulent parameters. The technique uses the scattering of the radio waves at the density fluctuations caused by the acoustic wave field. Compared to SODAR or RADAR techniques which have proven their reliable routine operation in various applications RASS shows no sensitivity to fixed echo, to environmental noise or to precipitation. The height range of the RASS sounding is limited only by the atmospheric absorption of the sound waves and the shift of he acoustic wave with the mean field. Depending on the specific choice of acoustic and radio operation frequencies and the geometric configuration of the antennas RASS can be optimized for profiling in height ranges of some hundreds meter to some kilometer. In view of on-line environmental monitoring at industrial sites RASS allows direct measurements of the profiles of the meteorological parameters for transport and dispersion, atmospheric stability and the formation and decay of inversions.
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