The Radio Acoustic Sounding System (RASS) extension to the Scintec's Sodar instruments determines viftual temperature profiles in the atmospheric boundary layer with high spatial and temporal resolution; this extension may be added to any Scintect Flat Array Sodars. Its measurement principles rests on the detection of electromagnetic waves scattered at the known density pattern of an acoustic wave, wheras the RASS trasmitter generates a continuous electromagnetic wave which is detected by the receiver component in the RASS Transceiver. The setup and operation mode classify the Scientec Sodar- Rass as a so-called bi-static, acoustical pulse modulated system. This means that the acoustic signal is a frequency-modulated pulse and that the electromagnetic signal is trasmitted continuously during RASS operation.
