THE USE OF NEAR-EARTH ORBITS BY SATELLITE SYSTEMS IN DIFFERENT FREQUENCY BANDS

2021 ◽  
Author(s):  
Н.В. ВАРЛАМОВ ◽  
С.С. УВАРОВ
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Geostationary Orbit ◽  
Frequency Bands ◽  
Satellite Systems ◽  
Elliptical Orbits ◽  
Earth Orbits ◽  
Satellite Service

Выполнен анализ интенсивности использования геостационарной орбиты (ГСО) и негеостационарных орбит (НГСО) современными системами спутниковой связи фиксированной спутниковой службы в Ки-, Ка- и Q/V-диапазонах частот. Исследование охватывает ГСО, а также два наиболее используемых сегмента НГСО с высотой апогея до 1500 км и выше 8000 км. Представлены также результаты исследований для высокоэллиптических орбит (ВЭО). Сделан вывод о дефиците орбитально-частотного ресурса на ГСО и НГСО для рассматриваемых диапазонов частот. The paper analyzes the intensity of the use of geostationary orbit (GSO) and non-geostationary orbits (non-GSO) by modern satellite communication systems of the fixed-satellite service in the Ku-, Ka- and Q/V-bands. The analysis is made for geostationary orbit and two most used segments of non-GSO orbits with apogee altitudes up to 1500 km and above 8000 km. Results for highly inclined elliptical orbits (HEO) are also presented. The analysis results show a shortage of orbital and frequency resources in GSOs and non-GSOs for the considered frequency bands.

INNOVATIVE METHOD OF SATELLITE COMMUNICATION

2019 ◽  
Author(s):  
Teodor Narytnik ◽  
Vladimir Saiko
Keyword(s):  
Communication Systems ◽  
High Speed ◽  
Satellite Communication ◽  
Radio Channel ◽  
Satellite Communications ◽  
Service Area ◽  
Satellite Systems ◽  
Orbit Satellite ◽  
Geometric Size ◽  
Distributed Satellite

The technical aspects of the main promising projects in the segments of medium and low-orbit satellite communication systems are considered, as well as the project of the domestic low-orbit information and telecommunications system using the terahertz range, which is based on the use of satellite platforms of the micro- and nanosatellite class and the distribution of functional blocks of complex satellite payloads more high-end on multiple functionally related satellites. The proposed system of low-orbit satellite communications represents the groupings of low-orbit spacecraft (LEO-system) with the architecture of a "distributed satellite", which include the groupings of the root (leading) satellites and satellite repeaters (slaves). Root satellites are interconnected in a ring network by high-speed links between the satellites. The geometric size of the “distributed satellite” is the area around the root satellite with a radius of about 1 km. The combination of beams, which are formed by the repeater satellites, make up the service area of the LEO system. The requirements for the integrated service area of the LEO system (geographical service area) determine the requirements for the number of distributed satellites in the system as a whole. In the proposed system to reduce mutual interference between the grouping of the root (leading) satellites and repeater satellites (slaves) and, accordingly, minimizing distortions of the information signal when implementing inter-satellite communication, this line (radio channel) was created in an unlicensed frequency (e.g., in the terahertz 140 GHz) range. In addition, it additionally allows you to minimize the size of the antennas of such a broadband channel and simplify the operation of these satellite systems.

A compact CPW-fed monopole antenna for multi-band application

2021 ◽  
pp. 1-7
Author(s):  
YunYan Zhou ◽  
NianShun Zhao ◽  
RenXia Ning ◽  
Jie Bao
Keyword(s):  
Mobile Communications ◽  
Radio Frequency Identification ◽  
Communication Systems ◽  
Satellite Communication ◽  
Coplanar Waveguide ◽  
Dielectric Substrate ◽  
Monopole Antenna ◽  
Radiation Characteristics ◽  
Frequency Bands ◽  
Compact Size

Abstract A compact coplanar waveguide-fed monopole antenna is presented in this paper. The proposed antenna is composed of three monopole branches. In order to achieve the miniaturization, the longest branch was bent. The antenna is printed on an FR4 dielectric substrate, having a compact size of 0.144λ0 × 0.105λ0 × 0.003λ0 at its lowest resonant frequency of 900 MHz. The multiband antenna covers five frequency bands: 820–990 MHz, 1.87–2.08 GHz, 2.37–2.93 GHz, 3.98–4.27 GHz, and 5.47–8.9 GHz, which covers the entire radio frequency identification bands (860–960 MHz, 2.4–2.48 GHz, and 5.725–5.875 GHz), Global System for Mobile Communications (GSM) bands (890–960 MHz and 1.850–1.990 GHz), WLAN bands (2.4–2.484 GHz and 5.725–5.825 GHz), WiMAX band (2.5–2.69 GHz), X-band satellite communication systems (7.25–7.75 GHz and 7.9–8.4 GHz), and sub 6 GHz in 5G mobile communication system (3.3–4.2 GHz and 4.4–5.0 GHz). Also, the antenna has good radiation characteristics in the operating band, which is nearly omnidirectional. Both the simulated and experimental results are presented and compared and a good agreement is established. The proposed antenna operates in five frequency bands with high gain and good radiation characteristics, which make it a suitable candidate in terminal devices with multiple communication standards.

scholarly journals IMPLEMENTATION OF THE GLOBAL AERONAUTICAL DISTRESS AND SAFETY SYSTEM (GADSS)

Aviation ◽  
2018 ◽  
Vol 22 (1) ◽  
pp. 24-30
Author(s):  
Dimov Stojce Ilcev
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Safety System ◽  
International Standards ◽  
Global Navigation Satellite Systems ◽  
Civil Aviation ◽  
Satellite Systems ◽  
Land Vehicles ◽  
Global Navigation Satellite ◽  
Global Communications

In this paper is introduced the first proposal for development of Global Aeronautical Distress and Safety System (GADSS) in 1999 by the author of this article. The GADSS is de facto the integration of space (radio and satellite) Communication, Navigation and Surveillance (CNS) with Tracking, Detecting and Search and Rescue (SAR) systems, which have to provide airmen with global communications and locating networks. The GPS, GLONASS and other Global Navigation Satellite Systems (GNSS) provide precise positioning data for vessels, land vehicles and aircraft, but modern CNS demands need for enhanced services and augmentation of GNSS networks. Both networks have to be integrated under an GADSS umbrella with elements capable of being operated by any individual onboard aircraft to ensure prompt distress alert for SAR procedure. The enhanced concept of GADSS is that SAR authorities ashore and ships in the immediate vicinity of the aircraft in distress have to be rapidly alerted via radio and satellite communication systems and to assist in a coordinated SAR operations with the minimum of delay. In 2016, 16 years in delay, the International Civil Aviation Organization (ICAO) has begun its process to amend international standards and recommended practices to align with GADSS concept. This paper will also introduce the necessary networks and equipment, which has to ensure harmonized and enhanced maritime and aeronautical global SAR systems.

scholarly journals Integration of satellite system and Stratospheric Communication Platforms (SCP) for weather observation

2016 ◽  
Author(s):  
◽  
Sihle S. Sibiya
Keyword(s):  
High Altitude ◽  
Communication Systems ◽  
Satellite Communication ◽  
Meteorological Data ◽  
Cost Effective ◽  
Satellite System ◽  
Satellite Systems ◽  
Observation Area ◽  
Solar Powered ◽  
Weather Observation

This doctoral research introduces an integration of satellite systems and new stratospheric platforms for weather observation, imaging and transfer of meteorological data to the ground infrastructures. Terrestrial configuration and satellite communication subsystems represent well-established technologies that have been involved in global satellite sensing and weather observation area for years. However, in recent times, a new alternative has emerged based on quasi-stationary aerial platforms located in the Stratosphere called High Altitude Platform (HAP) or Stratospheric Communication Platforms (SCP). The SCP systems seem to represent a dream come true for communication engineers since they preserve most of the advantages of both terrestrial and satellite communication systems. Today, SCP systems are able to help, in a more cost effective way, developments of space Earth sensing and weather observation and weather sensing and observation. This new system can provide a number of forms ranging from a low altitude tethered balloon to a high altitude (18 – 25 km) fuel-powered piloted aircraft, solar-powered unmanned airplanes and solar-powered airship.

scholarly journals The Internet of Things Space Infrastructure. Current State and Development Prospects

2021 ◽  
Author(s):  
Mikhail Ilchenko ◽  
Teodor Narytnyk ◽  
Vladimir Prisyazhny ◽  
Segii Kapshtyk ◽  
Sergey Matvienko
Keyword(s):  
Internet Of Things ◽  
Data Storage ◽  
Communication Systems ◽  
Data Centers ◽  
Satellite Communication ◽  
Low Earth Orbit ◽  
Geostationary Orbit ◽  
Cloud Data ◽  
Cloud Data Storage ◽  
The Internet Of Things

This chapter presents an overview of possibilities for existing Satellite Communication Systems utilization to provide Internet of Things Services. It is shown that existing Satellite Communication Systems provide traffic transmission for Internet of Things Systems with Cloud Architecture. The propositions on possibility of Fog and Edge computing implementation in Satellite Communication Systems are proposed. The ways for Low-Earth Orbit and Geostationary Orbit Satellite Communication Systems modernization for Fog and Edge computing implementation for the Internet of Things Systems are presented. To increase the efficiency of IoT data processing and the reliability of Internet of Things Data Storage, it is proposed to generate an Orbital Cloud Data Storage in Geostationary Orbit, which consists of several Geostationary Orbit Satellites - Cloud Computing Data Centers. Methods for access provision to the Orbital Cloud Data Storage using Geostationary Orbit High-Throughput Satellites and satellites from the structure of Low-Earth Orbit Satellite Communication Systems are proposed. The issues of interaction between Orbital Cloud Data Storage and ground-based Cloud Data Processing and Storage Infrastructure are briefly considered. The orbital slots in Geostationary Orbit are proposed for location of Geostationary Orbit Satellites - Cloud Computing Data Centers.

scholarly journals Introduction to polar earth orbits (PEO) in the function of the satellite distress and safety systems (SDSS)

2020 ◽  
Vol 19 (1) ◽  
pp. 285
Author(s):  
Dimov Stojce Ilcev
Keyword(s):  
Communication Systems ◽  
Polar Region ◽  
Satellite System ◽  
Economic Study ◽  
Safety Communication ◽  
Geo Satellite ◽  
Mobile Satellite ◽  
Safety Systems ◽  
Earth Orbits ◽  
Satellite Service

<p align="LEFT">In this paper is described introduction of Polar Earth Orbits (PEO) in the function of the Satellite Distress and Safety Systems (SDSS) for all mobile applications. The results of a technical and economic study regarding the extension of the Inmarsat Geostationary Earth Orbit (GEO) satellite system to cover polar region are reviewed. In addition, also are examined the technical and practical aspects of providing an operational polar Mobile Satellite Service (MSS) for the provision of combined distress and safety communication solutions in conjunction with a commercial and defense communication systems for maritime, land and aeronautical applications. This study is considered several PEO satellite models and their probable costs for Search and Rescue (SAR) and determination MSS solutions. The practical usage of Low PEO constellation is realized by Cospas-Sarsat international project for SDSS.</p>

Interference Modeling and Analysis for Inclined Projective Multiple Beams of GEO Satellite Communication Systems

2013 ◽  
Vol 756-759 ◽  
pp. 1204-1209 ◽  
Author(s):  
Wei Zheng ◽  
Bin Li ◽  
Shu Bo Ren ◽  
Jiang Chen ◽  
Jian Jun Wu
Keyword(s):  
System Performance ◽  
Communication Systems ◽  
Satellite Communication ◽  
Power Ratio ◽  
Interference Power ◽  
Coverage Area ◽  
Modeling And Analysis ◽  
Satellite Systems ◽  
Geo Satellite ◽  
Multiple Beams

In multi-beam satellite systems, Inter-Beam Interference (IBI) has a great effect on system performance. Within range of satellite coverage area, inclined projective multiple beams give rise to elliptic beam projections, resulting in that the distribution of beam projections is different from traditional cellular distribution. In this paper, an Inclined Projection (IP) model is proposed for IBI in OFDMA based GEO satellite communication systems, and corresponding analysis is also included. A comparison of carrier to interference power ratio (C/I) of users at the center of each cell with and without the consideration of IP is made, based on the simulation using different Frequency Reuse (FR) factor. The corresponding conclusions are presented. This research can provide reference for later satellite beam planning.

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