Analysis of Mobile Service Satellite Systems
Students Name: Hadzhala Maksym Stepanovych
Qualification Level: magister
Speciality: Technologies and Means of Telecommunications
Institute: Institute of Telecommunications, Radioelectronics and Electronic Engineering
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: ukrainian
Abstract: Hazhala M., Vaskiv G. (head). Analysis of satellite systems of mobile service. - Lviv Polytechnic National University, Lviv, 2020. Extended annotation The object of research are satellite communication systems Iridium, Thuraya, mobile service system with terrestrial mobile objects LMSS46, Globalstar system, ORBCOMM system. The subject of the study is the transmission of satellite signals over long distances The purpose of the study is to analyze the work and features of the principles of construction of satellite systems, types of communication and services provided. Satellite systems are an important solution for providing communication services to mobile users in sparsely populated areas, in emergency areas, on planes, trains and ships. In all these cases, satellite The systems have unique capabilities in terms of reliability, wide coverage and multicast broadcasting. The paper examines mobile communication systems and other mobile satellite networks and services from different perspectives, covering research issues, the latest advances in standardization (eg, mobile extension for DVB-S2 / -RCS, DVB-SH) and some operating systems for example, Globalstar, Inmarsat BGAN, Iridium and Thuraya). The main part of my work is devoted to qualitative and quantitative comparison of different communication systems of mobile service and mobile devices to fully understand their characteristics in terms of services, radiated power, as well as resource use, efficiency and mobility of users, design issues and standardization. Satellite networks are an attractive approach to communication services in different regions of the world, which are poorly served by the existing terrestrial infrastructure. There is a wide range of sectors (eg mobile, aviation, maritime, transport, rescue and military, etc.) mobile services where satellite is the only viable option This is the reason why there is currently increasing interest and market opportunities for the use of mobile satellite systems and technologies. Systems (MSS). Technologies for multi-beam antennas, low-noise receivers and on-board signal processing have made it possible to achieve direct satellite access for small, portable ground stations or even portable terminals using the S, L and recently developed Ku and Ka bands. Satellites with regenerative payload and inter-satellite lines can also be equipped, which allows you to switch traffic. Because MSS systems provide very large coverage areas, spectrum coordination is carried out on a regional or global basis. Each system is limited to operating at frequencies permitted by Administrations, as specified in Recommendation ITU-R M.1854. All MSS systems with low Earth orbit (LEO) and geostationary satellite orbit (GSO) provide service to very large coverage areas compared to terrestrial systems. In addition, some LEO MSS systems may also provide full coverage of the Earth, including coverage of the polar regions, subject to certain conditions. The coverage of the LEO system depends on the inclination of its orbit, as well as on the architecture of the system. Systems with satellites rotating at lower angles may not be able to cover the polar regions, while systems with satellites rotating at higher angles close to 90 ° may cover the polar regions.