Radar and Remote Sensing
A Sodar Simulator Based Upon Large Eddy Simulation
Ms. Charlotte Wainwright
Atmospheric Radar Research Center
School of Meteorology
19 April 2012, 1:15 PM
National Weather Center, Room 1350
120 David L. Boren Blvd.
University of Oklahoma
Sodars are widely used when monitoring and studying the atmospheric boundary layer (ABL). Monostatic sodar systems measure backscattered acoustic signal intensity, which is related to the structure function parameter for temperature, CT2. As such, sodar measurements can be related to the intensity and distribution of turbulence within the ABL. When operated using multiple non-coplanar beams, sodars are used to derive height profiles of the three-dimensional wind field. Given the utility of incorporating sodar data into studies of the ABL, we have recently developed a realistic sodar simulator that can be used to evaluate the performance of sodars and under controlled conditions.
The sodar simulator is designed to sample the output from a large eddy simulation (LES) code configured to model ABL conditions. The simulated sodar operating parameters such as frequency, height resolution, and pulse repetition time can be set to emulate existing systems or test new configurations. Moreover, the location of the sodar within the LES domain, number of beams, and beam positions can be set by the user. The sodar simulator generates time-series data, which facilitates testing of various signal processing techniques.
In this seminar the fundamentals of acoustic scattering theory will be presented and comparisons between electromagnetic and acoustic scattering will be discussed. Preliminary results from the sodar simulator will be presented.