scholarly journals STUDY OF EFFICIENCY OF APPLICATION OF DIFFERENT ANTENNAS FOR THE RECEIVING OF SPECIAL INFORMATION FROM THE SATELLITES TYPE OF CUBESAT FOR REMOTE SENSING OF THE EARTH

2018 ◽  
Vol 2 (48) ◽  
pp. 154-157
Author(s):  
O. V. Kalvatynsky
Keyword(s):  
Remote Sensing ◽  
Patch Antenna ◽  
Error Probability ◽  
Directional Pattern ◽  
Radio Link ◽  
Target Information ◽  
Helical Antenna ◽  
Special Information ◽  
Different Diameters ◽  
Transmitting Antenna

The subject matter of the article is the radio links of the target information of the space remote sensing systems (Earth remote sensing) from spacecraft of the CUBESAT type. The aim is to study the effectiveness of receiving antennas of different diameters (5 and 12 m), namely, changing the information receiving zone. The goal: to develop a mathematical for determining the minimum reception angles of the target information, taking into account the directional pattern and the flaps of the maximum of the diagram from the direction to the receiving station. Determine the minimum angles of the receiving location of the target information with a given error probability per bit of information (< 10-7) under the condition of different types of on-board transmitting antennas and receive antennas of different diameters. The methods used are: synthesis, mathematical modeling and graphical analysis of the results obtained. The following results are obtained. When using a transmitting helical antenna, the minimum reception angles with a given error probability per bit of information < 10-7 are less by 100 than using a patch antenna. But the value of signal to noise ratio (S/N) when using a helical antenna is dominated by a patch antenna at elevation angles greater than 640, subject to rotation in the direction of the receiving station. When using reflectors with a diameter of 5 m, it is possible to receive information with a specified error probability only for elevation angles greater than 23.50. Thus, the use of reflectors with a diameter of 12 m will significantly increase the possibilities for surveying the Earth's surface due to a longer session of receiving special information. Conclusions. Analysis of the technical characteristics of modern on-board components of spacecraft like CUBESAT has demonstrated the promise of using such spacecraft for environmental monitoring. The study of the CUBESAT satellite radio link was carried out taking into account the directional pattern of the on-board transmitting antenna of the target radio link, using a mathematical model created by the author. Using a patch antenna in comparison with a helix antenna makes it possible to extend the information receiving area with specified quality indicators by 100 by the elevation angle. Comparison of receiving stations with an antenna diameter of 5 and 12 m indicates the prospects of using reflectors of antenna systems with a diameter of 12 m, which are in Ukraine. The use of ground antennas with a reflector diameter of 12 m will allow receiving special information at minimum elevation angles of 120 under the conditions of the calculations (orbit height, on-board transmitter power, data transfer speed).

Miniaturized dual band aperture coupled patch antenna for remote sensing satellites

2018 ◽  
Author(s):  
V.Sai Kraanthi ◽  
Sandhya Reddy B. ◽  
P.V. Sitaraman ◽  
C. Sriharsha ◽  
Senthil Kumar V.
Keyword(s):  
Remote Sensing ◽  
Patch Antenna ◽  
Dual Band

scholarly journals СОЗДАНИЕ АРХИТЕКТУРЫ «РАСПРЕДЕЛЕННОГО СПУТНИКА» ДЛЯ НИЗКООРБИТАЛЬНЫХ ИНФОРМАЦИОННО-ТЕЛЕКОММУНИКАЦИОННЫХ СИСТЕМ НА ОСНОВЕ ГРУППИРОВКИ МИКРО- И НАНОСПУТНИКОВ

2018 ◽  
pp. 33-43
Author(s):  
Михаил Ефимович Ильченко ◽  
Теодор Николаевич Нарытник ◽  
Борис Михайлович Рассамакин ◽  
Владимир Ильич Присяжный ◽  
Сергей Владимирович Капштык
Keyword(s):  
Remote Sensing ◽  
Internet Of Things ◽  
Transport Infrastructure ◽  
Radio Link ◽  
Industrial Internet Of Things ◽  
Satellite Transmitter ◽  
Telecommunication Systems ◽  
The Earth ◽  
Industrial Internet ◽  
Distributed Satellite

Presented are the results of an analysis of the growing interest in the use of low Earth orbits (up to 1500 km high) for the introduction and development of the Internet of things (Internet of Things - IoT). Industrial Internet of things (Industrial Internet of Things-IIoT). Internet of things for remote areas (Remote Internet of Things - RioT, for the purposes of scientific research and economic use of natural resources, control of the development and operation of infrastructure projects, the operation of territorially distributed industrial production, transport infrastructure. Factors significantly limiting the further introduction of micro and nano satellites are given. The authors proposed to resolve this contradiction on the basis of the developed concept of creating the architecture of a "distributed satellite". As an example, the article considers possible applications of the distributed satellite architecture in two segments of the space information systems market: remote sensing of the Earth and telecommunication systems. The application of the "distributed satellite" in radar systems with synthesized aperture (SAR-system) was considered taking into account the requirements of the operators of satellite SAR-systems and consumers of their information. It is shown. that the use of the "distributed satellite" architecture in SAR-systems also makes it possible to realize the technology of multi-static radar with a "soft" interference base (from 200 m to 1 km). The scheme of organization and interaction of the "distributed satellite" in the satellite-transmitter on the platform of the micro satellite, which is the core of the satellite cluster, and several satellites-receivers on the cube-sat platform is presented. The functions performed by the satellite-transmitter, the inter-satellite radio link and the satellite-receiver are considered in detail. The work of the "distributed satellite" is illustrated by the presented structural diagram of the SAR-system for remote sensing of the Earth, a version of the architecture of the low-orbit satellite communication system and the scheme for constructing a satellite system for the provision of IoT services. In conclusion, it is noted that the architecture of the "distributed satellite" makes it possible to effectively use satellites of the class of micro/nano satellite (cube-sat) to create complex space-based information and telecommunication systems

Technical aspects of creating radiotechnical systems of information and command interface to ensure the functioning of complexes with unmanned aerial vehicles

Antennas ◽  
2021 ◽  
Author(s):  
D. G. Pantenkov
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Ground Control ◽  
Radio Link ◽  
Radio Lines ◽  
Signal To Noise ◽  
Target Information ◽  
System A ◽  
Aerial Vehicles ◽  
Radio Systems ◽  
Processing Point

One of the key components of the complexes with unmanned aerial vehicles (CUAV), which significantly affects the safety and reliability of operation, is the radio link for transmitting command-telemetric and target information of direct radio visibility (radio engineering system of information and command interface) between unmanned aerial vehicles (UAV) and the ground control and information processing point (GCSP). Heavy-class unmanned aerial vehicles can have several target loads simultaneously – a multispectral optical-electronic system, a digital aerial photo system, a radar system, a radio monitoring system, etc. Due to the fact that the flow of information with the payloads to the input of the radio link during peak time moments can be quite large, severe requirements are imposed as to the equipment of primary processing of the target information aboard the UAV and it’s compression in the recording information, and the bandwidth of the radio link in terms of transmission target information on GCSP for subsequent analysis and processing by the operator of the complex. Technical articles are the justification of modern approaches to the development of radio systems of information and team mates in the functioning of complexes with unmanned aerial vehicles, modeling and analysis of directional properties of the antenna system on the basis of the active phased array antenna (APAA) to ensure that decisions adopted targets CUAV, calculation and modeling of the use of various signal-code structures in the information and command-telemetry channels of the CUAV in order to assess the achievable data transfer rates and the energy budget of radio lines. The main tasks of the article are consideration of the nomenclature of possible target tasks of complexes with UAV, proposals for the technical implementation of radio systems of information and team mates, analysis of the advantages of using APAA as part of an unmanned aerial vehicle and a ground control and information processing point in order to improve the efficiency of UAV complexes in the end, modeling of directional diagrams in the azimuth and angular planes for receiving and transmitting modules and receiving and transmitting panels from the APAA, calculation of the energy budget of information and command radio lines, plotting the dependences of the error probability on the signal-to-noise ratio for various combinations of signal modulations and noise-tolerant encoding for various models of communication channels (additive white Gaussian noise – AWGN and binary-symmetric channel – BSC). The main results of the article include specific practical suggestions and recommendations on hardware and software approaches to the creation of antenna systems based on APAA as part of the CUAV, the effect of using modern approaches (reliability, reduced labor intensity and cost, improved performance characteristics), calculated signal-to-noise ratios for various methods of modulation and encoding, obtained as a result of calculations and mathematical modeling, as well as suggestions and recommendations for the rational use of specific types of signals and codes in the command-telemetry and information channels.

scholarly journals Remote sensing: the method of GIS application for monitoring the state of soils

2020 ◽  
Vol 175 ◽  
pp. 06009
Author(s):  
Igor Grishin ◽  
Rena Timirgaleeva
Keyword(s):  
Remote Sensing ◽  
Land Use ◽  
Remote Diagnostics ◽  
Land Use Efficiency ◽  
New Information ◽  
Use Efficiency ◽  
Special Information ◽  
Abiotic And Biotic Factors ◽  
High Degree ◽  
Modern Technologies

Modern technologies of remote sensing of the Earth from space allow creating new information systems for observing and studying various processes occurring in biogeocenoses and agrocenoses. This is especially important in the case when it comes to the study of grape agrocenoses, since their most important elements are perennial plants and soils that provide a harvest. In this case, it is necessary to create special information technology for monitoring such objects. This will allow forming a series of observations that are uniform in time and space and provide the ability to conduct an analysis with a high degree of reliability in the future. The aim of this work is to develop methodological foundations for the formation of a system for remote diagnostics of soil fertility of grape agrocenoses in connection with the technology of cultivation and bioecological features of cultivated crops in solving problems of improving land use efficiency, as well as the creation of a mock-up of information system for remote monitoring of grape agrocenoses on their basis, aimed at solving tasks of predicting the condition of soils and vineyards, obtaining objective information about predicted fertility, solving problems of increasing land use efficiency, taking into account soil cultivation technologies and bioecological features of cultivated crops, abiotic and biotic factors.

scholarly journals S and X band patch antenna for CubeSat nanosatellites

2021 ◽  
Vol 78 (3) ◽  
pp. 90-96
Author(s):  
N. Meirambekuly ◽  
◽  
B.A. Karibayev ◽  
A.A. Temirbayev ◽  
A.K. Imanbayeva ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Computer Simulations ◽  
Patch Antenna ◽  
Software Package ◽  
Fractal Structure ◽  
Anisotropic Structure ◽  
Earth Remote Sensing ◽  
X Band ◽  
Wide Range ◽  
High Degree

The CubeSat concept has become very popular with both university groups and researchers, space agencies, governments and companies. CubeSat offers a fast and affordable way for a wide range of stakeholders to be active in space. Due to the high degree of modularity and widespread use of off­the­shelf commercial subsystems, CubeSat projects can be prepared for flight much faster than using traditional satellite schedules usually within one to two years. In this paper, we have considered a model of an S and X band patch antenna for CubeSat nanosatellites in the field of Earth remote sensing (ERS). The antenna dimensions were determined and designed according to the dimensions of the small spacecraft. The shape of the emitting part was formed using a geometric fractal with an anisotropic structure. Using the CST Microwave Studio software package, the electro­dynamic, frequency characteristics and directional properties of the antenna were determined. The results of computer simulations demonstrate that the developed antenna concept has a multi­band property and meets all the parameters that are necessary for receiving and transmitting data in the S and X bands. It was also found that the anisotropic fractal structure allows the antenna to have several operating frequencies.

scholarly journals Methodology for managing the flows of target information in the remote sensing space system Part 2. Interrelated mathematical models systems formation

2021 ◽  
Vol 22 (2) ◽  
pp. 148-161
Author(s):  
Alexander V. Starkov ◽  
Andrey А. Emelyanov ◽  
Lyubov A. Grishantseva ◽  
Ksenia I. Zhukovskaya ◽  
Alexander A. Morozov ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Mathematical Models ◽  
Main Task ◽  
Space System ◽  
Target Information ◽  
Time Intervals ◽  
Earth Remote Sensing ◽  
Orbital Parameters ◽  
The Earth ◽  
The Cost

In the second part of the series of articles, the issues of the systemic organization of mathematical models for solving the problem of controlling the flows of target information in the Earth remote sensing space system are considered. A description of the interrelated mathematical models of the orbital constellation as components of the information system, the main task of which is to survey ground objects and the formation of the initial volume of information for its further processing, is presented. To calculate the time of servicing the request by the space segment, the following methods of formation are proposed: a model of the evolution of the Earth remote sensing spacecraft orbit; model for forecasting possible spacecraft correction intervals to maintain nominal orbital parameters; model for forecasting possible time intervals for on / off cycles of observation equipment; model for forecasting possible time intervals for dumping the received information to the information reception points. When calculating the cost of servicing a single request from the orbital complex, both the cost of servicing one spacecraft per unit of time and the cost of processing a single request from the ground complex were taken into account. In conclusion, a generalized form of representation of the target information flow model of the Earth remote sensing space system is proposed as an interconnected sequence of functions for changing the amount of information when an appropriate processing process (traffic change functions) is applied to it. General approaches to solving the optimization problem are considered.

How Can Environment Influence Ultra-Long Radio Propagation?

2018 ◽  
Vol 7 (2.23) ◽  
pp. 479
Author(s):  
M S. Mikhailov ◽  
A A. Volkova ◽  
V A. Permyakov
Keyword(s):  
Small Deviation ◽  
Sea Surface ◽  
Radio Propagation ◽  
Radio Link ◽  
Sea Waves ◽  
Evaporation Duct ◽  
Optimal Excitation ◽  
Vertical Variations ◽  
Elevated Surface ◽  
Transmitting Antenna

Even a small deviation of the environmental parameter can lead to significant changes in the propagation over long distances. The article investigates the radio propagation above the sea, taking into account the distortion of the refractive index caused by evaporation. This feature of the troposphere is called the evaporation duct. The radio propagation over-the-horizon in the evaporation duct is possible. The conditions for optimal excitation of the evaporation duct by a highly directional antenna are studied. The main factors influencing the range of the radio link are studied, such as the height of the transmitting antenna and attenuation in air and in hydrometeors and diffraction at sea waves. Also, the effect of vertical variations the evaporation duct on radio propagation is considered. In addition, elevated-surface duct may appear over the sea surface separately or together with the evaporation duct. The effect of an elevated surface and mixed ducts on the radio propagation is considered. The radio propagation is calculated by the parabolic equation method. 

THE USE OF MISO SYSTEMS FOR SENDING MESSAGES TO SUBSCRIBERS LOCATED IN THE SERVICE AREA OF THE TRANSMITTING STATION

2020 ◽  
Author(s):  
М.А. БЫХОВСКИЙ
Keyword(s):  
Communication Network ◽  
Wave Propagation ◽  
Amplitude Modulation ◽  
System Application ◽  
Error Probability ◽  
Channel Model ◽  
Spatial Diversity ◽  
Multipath Channels ◽  
Wireless Access ◽  
Transmitting Antenna

В работе выполнено исследование эффективности применения систем Аламоути и MISO, в которыхдля передачи сообщений в многолучевых каналах в сети связи (сотовой, беспроводного доступа или сети радиовещания) используется не -сколько разнесенных в пространстве передающих антенн. В основу исследования положена модель многолучевого канала, учитывающая физические аспекты распространении радиоволн. Предложен аналитический метод исследования систем MISO. Получены формулы для расчета вероятности ошибки при демодуляции сигналов с квадратурно-амплитудной модуляцией в системах MISO, Аламоути и в системе, использующей для передачи сигналов только одну передающую антенну. Оценен энергетический выигрыш, который дает применение системы MISO. Даны рекомендации по выбору оптимальной величины пространственного разнесения передающих антенн в исследованных системах MISO и Аламоути. The study investigates the effectiveness of the application of the Alamouti and MISO systems, in which several spatially separated transmitting antennas are used for sending messages in multipath channels in a communication network (cellular wireless access, or broadcasting network). The study is based on a multipath channel model that takes into account the physical aspects of radio wave propagation. An analytical method for the study of MISO systems is proposed. Formulas are obtained for calculating the error probability for demodulation of quadrature-amplitude modulation signals in MISO, Alamouti systems, and in the system using only one transmitting antenna. The energy gain of the MISO system application is estimated. Recommendations are given on choosing the optimal spatial diversity of transmitting antennas in the researched MISO and Alamouti systems.

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