I.A. Lipatov – Ph.D. (Eng.), Head of Laboratory of Management Department, JSC «SPE «Radiosvyaz» (Krasnoyarsk)
V.M. Nikolayenko – Ph.D. (Eng.), Leading Research Scientist, Management Department, FGBU 16 TsNIII MO RF (Mytishchi)
S.N. Totsky – Head of Laboratory of Management Department, FGBU 16 TsNIII MO RF (Mytishchi)
А.N. Frolov – Deputy Technical Director, JSC «SPE «Radiosvyaz» (Krasnoyarsk)
A.A. Kazakov – Head of Sector, JSC «SPE «Radiosvyaz» (Krasnoyarsk)
A.A. Chumachenko – Head of Sector, JSC «SPE «Radiosvyaz» (Krasnoyarsk)
In recent years, there has been a positive trend of introducing civil communications technologies in the communications systems of Force structures. To a large extent, this trend has affected satellite communications systems. This article attempts to clarify the role and place of civil technologies in developing trunk satellite communications network of the Ministry of Defense.
So today the following types of network technologies are used:
The main networks in the military satellite communications system are [1,2]:
radial-nodal communications networks, in traffics channels of C- and X-bands with on-board signals processing;
nodal trunk communications networks, based on FDMA ECCC technology in the traffic channels of C- and X-bands with direct
nodal trunk communications networks, based on EASTAR technology in the traffic channels of C- and X-bands with direct retransmission;
nodal networks of low-energy stations based on FDMA and (or) CDMA technologies with providing channels on demand, under cen-tralized control in the traffic channels of C- and X-bands with direct retransmission;
networks of portable stations in special narrow-band traffic channels of C- and X-bands with direct retransmission of signals.
The networks capacity of portable stations in the mode of CDMA is determined not only by characteristics of signals code division and allocated frequency resource, and in the mode of FDMA – by the frequency resource and the characteristics of the emitted signals spectra, but also by the energetic potential allocated for the broad-band channels of the portable stations.
At the same time, it is necessary to solve a number of problems concerning terminal equipment that use specific codes, as well as centralized control of CDMA and FDMA networks and determining the order of obtaining initial data for communications networks
Considering the commissioning high-energy airborne retransmitters of prospective dual-purpose communication spacecrafts and in-stallation of powerful traffic channels of C- and X-bands on civil communication spacecrafts, it is possible to increase the capacity of the portable stations up to 64 kbit/s.
Nowadays EASTAR network technology is also being actively implemented; its use allows to increase the capacity of subscriber stations without changing their energetic potential.
When using EASTAR technology, in general, following network modes can be carried out:
TDM/TDMA, SCPS mode. Communication in a network is according to the «star» scheme;
TDM/TDMA mode, SCPC. Communication in a network is according to the «star» scheme;
TDM/TDMA full mesh mode. The network structure is similar to the structure of ECCC-2 nodal communications network;
TDM/TDMA, SCPC, full mesh mode. The network structure is similar to the structure of ECCC-2 nodal communications network. Sub-scriber stations are connected both with central stations (node stations) and with each other;
TDMA Hubless mode. The contact between the subscriber stations is arranged in a multifunctional network, either on a «Star»-principle or on the full mesh principles.
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