Radio Accoustic Sounding System

By adding an acoustic attachment to the MST Radar remote profiling of atmospheric temperature in the troposphere and lower stratosphere is possible on a continuous basis. The fundamental principle of Radio Acoustic Sounding System (RASS) is based on the fact that acoustic speed is proportional to the square of atmospheric temperature.

When an acoustic pulse is transmitted, it generates refractive index fluctuations that propagate at acoustic speed and effectively scatter radio waves when the Bragg condition is satisfied between the acoustic and radar wavelengths.

Profiles of temperature reaching an altitude of 15 km with a time resolution of 5 minutes is successfully tested. For acoustic system signal is generated using Network audio receiver ONKYO NC-500 operating at frequency 90–130 Hz with acoustic power of 140 dBA and it uses Hyperbolic horn antenna.