Описание: Global mobile satellite communications (GMSC) are specific satellite communication systems for maritime, land and aeronautical applications. It enables connections between moving objects such as ships, vehicles and aircrafts, and telecommunications subscribers through the medium of communications satellites, ground earth stations, PTT or other landline telecommunications providers. Mobile satellite communications and technology have been in use for over two decades. Its initial application is aimed at the maritime market for commercial and distress applications. In recent years, new developments and initiatives have resulted in land and aeronautical applications and the introduction of new satellite constellations in non-geostationary orbits such as Little and Big LEO configurations and hybrid satellite constellations as Ellipso Borealis and Concordia system. This book is important for modern shipping, truck, train and aeronautical societies because GMSC in the present millennium provides more effective business and trade, with emphasis on safety and commercial communications. Global Mobile Satellite Communications is written to make bridges between potential readers and current GMSC trends, mobile system concepts and network architecture using a simple mode of style with understandable technical information, characteristics, graphicons, illustrations and mathematics equations. Global Mobile Satellite Communications represents telecommunications technique and technology, which can be useful for all technical staff on vessels at sea and rivers, on all types of land vehicles, on planes, on off shore constructions and for everyone possessing satellite communications handset phones.
Описание: * A new and updated edition of the highly successful comprehensive reference to satellite communications. * Includes more information on techniques allowing service provision of multimedia content * Discusses the mobile satellite channel in view of expected developments of broadcasting.
Описание: Significant progress has been made in the last decade in the understanding and modeling of propagation effects on radio wave propagation in the bands utilized for satellite communications, including extensive direct measurements and evaluation utilizing orbiting satellites. This book provides a single source for a comprehensive description and analysis of all of the atmospheric effects of concern for todays satellite systems and the tools necessary to design the links and evaluate system performance. Many of the tools and calculations are provided in a handbook form, with step-by-step procedures and all necessary algorithms in one place to allow direct calculations from one source. Covers: Satellite Orbits, Satellite Subsystems, The RF Link, Link System Performance, Transmission Impairments, Propagation Effects Modeling Analog Satellite Systems, Signal Processing Digital Satellite Systems, Satellite Multiple Access, Mobile Satellite Networks, Satellite Broadband, Satellite Applications and Trends
Описание: The Global Positioning System (GPS) may be used in conjunction with Inertial Navigation Systems (INS) for tracking and navigation and may be applied in the civilian and military sectors to track devices, to locate people and objects, in the air, on the ground, or at sea.
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