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Low-Orbit Satellite Communications

#0864


New Generation Global Low-Earth-Orbit Satellite Communications: Concept Definition and Development of Scientific-Technical and Technological Fundamentals

Tech Area / Field

  • SAT-UNM/Unmanned Spacecraft/Space, Aircraft and Surface Transportation

Status
3 Approved without Funding

Registration date
05.02.1997

Leading Institute
Central Research Institute of Machine Building (TsNIIMash), Russia, Moscow reg., Korolev

Supporting institutes

  • Far East Technological Institute (2), Russia, Moscow\nMoscow Power Engineering Institute, Russia, Moscow\nVoronezh Research Instittute of Communications, Russia, Voronezh reg., Voronezh

Project summary

The proposed Project is aimed at developing new scientific-technical and technological principles for forming advanced multi-purpose global systems for personal satellite communication to use the principles as a basis for defining the concept of creating a new-generation global Low-Earth-Orbit (LEO) Satellite Communication System (SCS) having improved service quality features.

The presented proposal for creating the new-generation low-Earth-orbit system for personal satellite communication is based on a rather complex idea of integrating dozen thousands of globally distributed and simultaneously operating user terminals and many dozens of relay-satellites changing their positions relative to the terminals into a unified and interactive network operating in a synchronized and robust manner. The key idea of the proposals is that each relay-satellite would provide reliable control for operations of every user terminal and adjacent satellites staying within the service zone and in turn the user terminals and adjacent relay-satellites would actively assist in converting flows of signals radiated by them into a unified controllable synchronized flow which could be easily handled aboard each relay-satellite.

The improved service quality features of the proposed new-generation personal satellite communication system would be ensured on the basis of the solutions discovered to solve the said key problem in combination with implementation and proposals for realization of the most advanced methods of multiple access (CDMA and TDMA, FDMA and SDMA), new forms of pseudo-random signals, multibased data coding, intersatellite communication links and novel methods of initial locking for user terminals and relay-satellites with their adaptation to the communication system operation environment and user requirements, artificial intelligence elements introduction and provisions for large service data flows to ensure reliable matching of operation of the system separate elements.

Compared with the known analogues (such as Indium, Globalstar, etc.) the novel solutions would provide:


- higher throughput capacity and better interference immunity of the communication channels;
- better profitability in production and operation;
- increased confidelity and versatility and improbability of unauthorized access to the communication system;
- higher reliability of the communication system;
- higher versatility and flexibility of the system specifically in meeting user requirements for a wide range of data rates (from hundreds of bps to dozens of Mbps), for service quality and extra services.

The proposed concept capabilities would be defined by effectiveness validation for the new scientific-technical and technological principles determined by selection of valid combinations of multiple access methods. They would be also defined by effectiveness and implementation of the proposed methods for synchronizing satellite transmitters and receivers with user terminals, of a proposed method for multibased coding, and by effectiveness of adapting satellite stations and user terminals to the channels operation conditions and to user requirements to be evaluated within the proposed Project.

The principles for configuring the advanced communication system are protected by three Russian patents, some early inventions and by an international patent Those inventions were awarded a Gold Medal of the Brussels-Evrica-96 International Salon and a special prize of the Salon organizers and jury. The patents availability creates a basis for a certain and independent development of the global communication system.

The Project is open for foreign firms and organizations wishing to participate both in shared financing of the Project and in its implementation at every stage of the life cycle, particularly at the final stage.


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