@ARTICLE{Rakov_Denis_S._High-Directional_2020,
 author={Rakov, Denis S. and Rakov, Aleksandr S. and Chursin, Yury A. and Pavlichev, Vsevolod V. and Igumnov, Artyom O.},
 volume={vol. 45},
 number={No 4},
 journal={Archives of Acoustics},
 pages={747-752},
 howpublished={online},
 year={2020},
 publisher={Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics},
 abstract={The article discusses the issues of accounting the direction pattern of parametric antenna array the propagation of sound over the Earth’s surface. As a radiator, a parametric antenna array is used. A description is given of measuring equipment and experimental research methods. The Delaney-Bezley model was used as a model of the Earth’s surface impedance. The research results showed the importance of accounting the direction pattern of parametric antenna array in predicting the sound pressure level of a propagating acoustic signal over the Earth’s surface. On the example of a difference signal with a frequency of 2 kHz, the calculation of the sound pressure level on a 100-meter path with the influence of the Earth’s surface is shown. The results obtained showed a good agreement between the theoretical calculation and experimental data.},
 type={Article},
 title={High-Directional Sound Propagation Over the Earth’s Surface},
 URL={http://journals.pan.pl/Content/118265/PDF/aoa.2020.135280.pdf},
 doi={10.24425/aoa.2020.135280},
 keywords={parametric loudspeaker, ultrasound, primary frequency, difference frequency, radiation pattern, outdoor propagation of sound, sound attenuation},
}