RADIO ACOUSTIC SOUNDING SYSTEMS: PART 3. PARAMETERS OF RECEIVED SIGNAL AT THE LOW SOUNDING PATH

摘要

The -present paper covers solving of a diffraction problem. The point is the electromagnetic wave diffraction by inhomogeneities of air permittivity while propagating acoustic wave packet in the lower section of sounding path by bistatic Radio Acoustic Sounding Systems with aperture antennas. This work provides the approximation technique of the wave field distribution to bring a very cumbersome expression of the received signal to the more convenient form for numerical calculations. It takes into account the properties of directed wave beams. The physical factors of the electromagnetic-acoustic field interaction are considered. It was created a numerical model, and an algorithm for calculating the intensity and the Doppler frequency shift of the received signal in a bistatic zone of the RASS has been described. Physical simulation results including available experimental data, model accuracy and the ways of its improvements have been analyzed.