PERTANIKA JOURNAL OF SCIENCE AND TECHNOLOGY

 

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Algorithm for the Joint Flight of Two Uncrewed Aerial Vehicles Constituting a Bistatic Radar System for the Soil Remote Sensing

Gennady Linets, Anatoliy Bazhenov, Sergey Malygin, Natalia Grivennaya, Тatiana Сhernysheva and Sergey Melnikov

Pertanika Journal of Science & Technology, Volume 31, Issue 4, July 2023

DOI: https://doi.org/10.47836/pjst.31.4.25

Keywords: Brewster’s angle, flight algorithm, radar system, remote sensing, soil moisture, total refraction, UAV

Published on: 3 July 2023

The study of soil agrophysical and agrochemical properties is based on ground-based point measurements and measurements conducted using radiometric remote sensing systems (satellite or airborne). A disadvantage of the existing remote sensing systems using normal surface irradiation is the insignificant depth of penetration of the probing radiation into the soil layer. It is proposed to use a radar system for remote sensing agricultural lands to eliminate this drawback. The system uses a method for assessing the soil’s physical and chemical properties based on the interference measurements of direct and reflected electromagnetic waves at incidence angles that provide a total refraction effect, i.e., close to Brewster’s angle. The possibility of using this method for remote assessment of soil’s physical and chemical properties, including the subsurface layer moisture, was established. A feature of the bistatic system is that it is necessary to coordinate the mutual arrangement of the transmitting and receiving positions, which imposes special requirements on the UAVs’ flight algorithm. The UAVs’ relative position makes it possible to form the conditions for the manifestation of the total refraction effect, to determine the current value of Brewster’s angle, and to fix these conditions for the subsequent flight, making it possible to measure the soil’s physical and chemical parameters. The research results can be used to implement precision farming technology in hard-to-reach places, large agricultural areas, and digital agriculture.

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ISSN 0128-7680

e-ISSN 2231-8526

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JST-3835-2022

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