Optimization of antennas elevation angles for atmospheric boundary layer acoustic sounding system
DOI:
https://doi.org/10.15587/1729-4061.2014.27900Keywords:
acoustic sounding, atmospheric boundary layer, antenna elevation angles, standard errorAbstract
Using acoustic locators is effective to solve the problems of studying wind conditions in the atmospheric boundary layer. These locators are based on the monostatic and bistatic principle. In the first case, the wind velocity vector is determined by the results of sounding in three directions, in the second - three-channel system with three different receiving antennas, radiation patterns of which intersect vertically-oriented radiation pattern of the transmitter antenna at a given point in space is used. In each direction of signal reception by the measured value of the Doppler frequency shift, the value of the wind velocity projection at the geometric axis of the receiving antenna is determined and then using the appropriate matrix transformations, wind velocity projections in the Cartesian coordinate system are calculated. The most important characteristic of any measurement system is the total standard measurement error, the value of which depends on the system configuration and total error components, defined by technical characteristics of the system. The analysis of the dependence of the measurement error of the most important for the practice horizontal component of the wind velocity depending on the antenna elevation angle was carried out, the nonlinear dependence of this quantity was shown. Its values are minimized in the certain range of angles that are optimal for the system construction.
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