ISSN:
2181-3906
2024
International scientific journal
«MODERN
SCIENCE
АND RESEARCH»
VOLUME 3 / ISSUE 2 / UIF:8.2 / MODERNSCIENCE.UZ
45
CHARACTERISTICS OF RADIO WAVE PROPAGATION IN URBAN
CONDITIONS.
Muhammad Islomov
Assistant
Jizzakh Polytechnic Institute, Republic of Uzbekistan, Jizzakh.
https://doi.org/10.5281/zenodo.10628146
Abstract. In urban conditions, the propagation of radio waves has a more complex nature
than on the flat surface of the Earth. The construction of the city creates a non-homogeneous
environment filled with irregularly located semiconductor barriers. Therefore, not one, but several
waves reflected from the surrounding buildings and obstacles and diffracted on the roof of the
buildings arrive at the reception point.
Keywords: Signal, wave, electromagnetic field, plane waves, homogeneous medium, Plane
electromagnetic wave, amplitude, Vacuum.
ХАРАКТЕРИСТИКИ РАСПРОСТРАНЕНИЯ РАДИОВОЛН В ГОРОДСКИХ
УСЛОВИЯХ.
Аннотация. В городских условиях распространение радиоволн имеет более
сложную природу, чем на плоской поверхности Земли. Строительство города создает
неоднородную среду, наполненную неравномерно расположенными полупроводниковыми
барьерами. Поэтому в точку приема приходит не одна, а несколько волн, отраженных от
окружающих зданий и препятствий и дифрагировавших на крыше зданий.
Ключевые слова: Сигнал, волна, электромагнитное поле, плоские волны, однородная
среда, Плоская электромагнитная волна, амплитуда, Вакуум.
Characteristics of radio wave propagation in urban conditions.
In urban conditions, the propagation of radio waves has a more complex nature than on the
flat surface of the Earth. The construction of the city creates a non-homogeneous environment
filled with irregularly located semiconductor barriers. Therefore, not one, but several waves
reflected from the surrounding buildings and obstacles and diffracted on the roof of the buildings
arrive at the reception point.
ISSN:
2181-3906
2024
International scientific journal
«MODERN
SCIENCE
АND RESEARCH»
VOLUME 3 / ISSUE 2 / UIF:8.2 / MODERNSCIENCE.UZ
46
Figure 5.3. Multibeam propagation of radio waves in urban conditions
Since it is extremely difficult to determine the phases and amplitudes of these waves, the
experimental data are of special interest. Because the architecture of the city has a significant effect
on the nature of the propagation of radio waves.
In mobile communication systems, the propagation properties of the transmitted signals are
strongly dependent on the optical scattering and radio wave scattering phenomena caused by the
inhomogeneous environment. This causes a change in the field strength at the receiving point. The
change of the radio signal level has the appearance of a fast level change and a slow level change
based on its statistical characteristics. Gradual level changes are usually due to small changes in
the topography of the propagation medium. A rapid level change occurs in the reflection of a signal
from stationary and moving objects and is called multi-beam fading.
Signal propagation between base stations and mobile communication devices mainly
depends on this multipath fading. In addition to the shift and superimposition of pulses during re-
reflection, polychromaticity, level changes, it leads to "delay expansion" ("impulse expansion").
When radio waves are reflected and fall on top of each other, they create the phenomenon
of multibeam scattering and depolarization, that is, the plane of polarization of the signal changes
and an orthogonally polarized signal is formed.
In urban conditions, the quality of radio reception is significantly affected by industrial
interference. When considering these factors, it is generally assumed that the receiving antenna of
the mobile receiving facility is below roof height.
REFERENCES
1.
Islomov, M., & Irisboyev, F. (2023). IOT (INTERNET OF THINGS) TECHNOLOGIES
OF INTERNET DEVICES. Modern Science and Research, 2(9), 220-223.
2.
Islomov, M. . (2023). CALCULATION OF SIGNAL DISPERSION IN OPTICAL
FIBER. Modern Science and Research, 2(10), 127–129.
3.
Boymirzayevich,
I.
F.,
&
Husniddin
o'g'li,
I.
M.
(2023).
INTERNET
QURILMALARINING IOT (INTERNET OF THINGS) TEXNOLOGIYALARI.
4.
Isaev R.I., Atametov R.K., Radjapova R.N. Telekommunikatsiya uzatish tizimlari. -«Fan
va texnologiya», 2011. — 520 bet.
5.
Sifrovыe i analogovыe sistemы peredachi: Uchebnik dlya vuzov/ V.I. Ivanov, V.N.
Gordienko, G.N. Popov, R.I. Isaev i dr.; Pod red. V.I. Ivanova.- 2-e izd. –M.: Goryachaya
liniya – Telekom, 2003.
6.
ITU-T Manual, 2009, Malkom Jonson. – Optical fiberes, cables and systems. 293 p.
7.
Sklyarov O. K. Volokonno - opticheskie seti i sistemы svyazi: Uchebnoe posobie. 2e izd.,
ster. — SPb.: Izdatelstvo «Lan», 2010. — 272 s.
8.
Islomov, M. (2023). CALCULATION OF SIGNAL DISPERSION IN OPTICAL
FIBER.
Modern Science and Research
,
2
(10), 127-129.
9.
Islomov, M., & Irisboyev, F. (2023). IOT (INTERNET OF THINGS) TECHNOLOGIES
OF INTERNET DEVICES. Modern Science and Research, 2(9), 220–223. Retrieved from
https://inlibrary.uz/index.php/science-research/article/view/24108
10.
Islomov, M. . (2023). CALCULATION OF SIGNAL DISPERSION IN OPTICAL
ISSN:
2181-3906
2024
International scientific journal
«MODERN
SCIENCE
АND RESEARCH»
VOLUME 3 / ISSUE 2 / UIF:8.2 / MODERNSCIENCE.UZ
47
FIBER. Modern
Science
and
Research, 2(10),
127–129.
Retrieved
from
https://inlibrary.uz/index.php/science-research/article/view/25048
11.
Mirzaev, U., Abdullaev, E., Kholdarov, B., Mamatkulov, B., & Mustafoev, A. (2023).
Development of a mathematical model for the analysis of different load modes of operation
of induction motors. In E3S Web of Conferences (Vol. 461, p. 01075). EDP Sciences
12.
J.T., M., & F.B., I. (2023). VOLATILE AND NON-VOLATILE MEMORY DEVICES.
Modern Science and Research, 2(10), 116–119.
13.
Ж.
Метинкулов
ИСПОЛЬЗОВАНИЕ
МИКРОКОНТРОЛЛЕРОВ
ДЛЯ
УПРАВЛЕНИЯ НАПРЯЖЕНИЕМ Vol. SCIENTIFIC APPROACH TO THE
MODERN EDUCATION SYSTEM 2 No. 20 (2023):
14.
Ирисбоев, Ф. Б., Эшонкулов, А. А. У., & Исломов, М. Х. У. (2022). ПОКАЗАТЕЛИ
МНОГОКАСКАДНЫХ УСИЛИТЕЛЕЙ.
Universum: технические науки
, (11-3 (104)),
5-8.
15.
Islomov, M., & Irisboyev, F. (2023). IOT (INTERNET OF THINGS) TECHNOLOGIES
OF INTERNET DEVICES.
Modern Science and Research
,
2
(9), 220-223.
16.
Irisboyev, F. (2022). ELEKTR SIGNALLAR KUCHAYTIRGICHLARI VA ULARNING
ASOSIY PARAMETRLARI VA TAVSIFLARI.
Евразийский журнал академических
исследований
,
2
(11), 190-193.
17.
Irisboyev,
F.
(2022).
YARIMO
‘TKAZGICHLI
MODDALARDAN
TAYYORLANADIGAN
KUCHAYTIRGICHLARNING
PARAMETRLARI
VA
XARAKTERISTIKALARI.
Science and innovation
,
1
(A6), 374-377.
18.
Irisboyev, F. B. (2022). ELEKTRON ZANJIRLAR VA MIKROSXEMOTEXNIKA
QURILMALARINING ASOSLARI.
Academic research in educational sciences
,
3
(10),
15-19.
19.
Irisboyev, F. (2024). CLUSTERS OF SELENIUM ATOMS IN THE SILICON
LATTICE.
Ilm-fan va ta'lim
,
2
(1 (16)).
20.
Irisboyev, F. (2024). ASYNCHRONOUS MACHINE TYPES, STRUCTURE AND
PRINCIPLE OF OPERATION.
Ilm-fan va ta'lim
,
2
(1 (16)).
21.
Irisboyev, F. (2023). THE INPUTS ARE ON INSERTED SILICON NON-BALANCED
PROCESSES.
Modern Science and Research
,
2
(10), 120-122.
22.
Boymirzayevich, I. F. (2023). THE INPUTS ARE ON INSERTED SILICON NON-
BALANCED PROCESSES.
23.
Islomov, M., & Nasriddinov, A. (2024). INTERNET NARSALAR OLDIDA BIZNI
NIMA KUTMOQDA.
Ilm-fan va ta'lim
,
2
(1 (16)).
24.
Irisboyev, F. (2022). PARAMETERS AND CHARACTERISTICS OF AMPLIFIERS
MADE OF SEMICONDUCTOR MATERIALS.
Science and Innovation
,
1
(6), 374-377.