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National SAS Marsat 4

Federal State Unitary Enterprise “Morsviazsputnik” (national operator of the Inmarsat satellite system on the territory of the Russian Federation) has been providing the operation and development of Inmarsat Russian segment for 40 years since signing the Operating Agreement within the framework of the Convention on Inmarsat by the Soviet Union in 1976. Since that time, Morsviazsputnik was given the functions of the Inmarsat system operator. In 1986, with the direct participation of Morsviazsputnik, two land earth stations (LES) were built in Nakhodka and Odessa. They operated through the first two generations of Inmarsat satellites providing voice services, and laid the foundation of the Inmarsat national segment in the USSR. Morsviazsputnik modernized the LES in Nakhodka for its further operation through the Inmarsat third generation satellites. In 2002, to provide coverage of all the territory of the Russian Federation when operating through the third generation of Inmarsat satellites, Morsviazsputnik put into operation a new LES "Nudol" in Moscow region. Nowadays, the Inmarsat Russian segment consists of 2 LES, located in the village Narynka of Klin district, Moscow region ("Nudol") and in Nakhodka city, Primorsky Krai. The Russian segment of the system also includes a communication interface and control center "Teplyi Stan" (Moscow), data transmission network components and circuit switching MMTS-9 (Moscow) and Telecity 1 (Amsterdam, Netherlands), as well as end user terminals.


россиийский сегмент инмарсат

In 2005-2008, satellites of a new Inmarsat-4 (I-4) generation BGAN (Broadband Global Area Network) were launched. Global coverage of BGAN network is provided by four satellites in the orbital slots: 25 ° E  (covering Europe, Middle East and Africa), 98 ° W (covering North, South and Central Americas) and 143.5 ° E (covering Asia and the Pacific Region). In the position of 25 ° E two satellites are located. They are I-4 and Alphasat. Each I-4 satellite generates hundreds of high-capacity beams that can be operatively configured to provide the necessary network carrying capacity in areas of high demand for services. The ground segment of the global BGAN network consists of three regional Satellite Access Stations located in Fucino (Italy), Burum (Netherlands) and Palmalu (Hawaii, USA). The absence of terrestrial gateways for the Inmarsat fourth-generation satellite system in Russia was a factor constraining the use of broadband services of Inmarsat BGAN standard. Work through the gateways, placed outside of the Russian Federation, caused a delay in the information passage for Russian customers. The difficulties associated with the conjugation with the Russian segment of the public telecommunications network, and the inability to use the means of transmitted information protection at these stations did not allow performing the requirements of the information security for a number of public users in full.

In order to provide further modernization of the Inmarsat Russian segment as well as to ensure fulfillment of the requirements of the RF Government Resolution No.1194 "On International Legal Protection of Assignment (Appointment) of Radio Frequencies or Radio Frequency Channels and Order of Use of Satellite Communication Networks under the Jurisdiction of Foreign States in Russia" the Ministry of Transport of the Russian Federation together with the Federal State Unitary Enterprise "Morsviazsputnik" prepared and made a proposal to the RF Government on the creation and development of national terrestrial means (gateways) of the Inmarsat mobile satellite communication system for Inmarsat fourth generation satellites in Russia –SAS “Marsat-4”.

In accordance with the Decree of the Government dated January 23, 2014 the order of financing works was determined, and then an agreement between Morsviazsputnik and Inmarsat Global Co., Ltd. for creation of Inmarsat Satellite Access Station  of the fourth generation  for BGAN, FleetBroadband, SwiftBroadband services in Russia was signed. Within its framework Morsviazsputnik performs works on construction of the national satellite access station (SAS Marsat-4) of the Inmarsat network on the territory of the Russian Federation. According to results of design works performed by Morsviazsputnik the total amount of the required investments to be carried out by extra-budgetary sources was determined. The volume of investments in the SAS “Marsat-4” construction is about RUR 1.5 billion.

The structure of the new SAS in general repeats the standard structure of the connection node of the 3G standard, allows users to access services via Inmarsat satellites of the fourth generation.


SAS Marsat4


The national SAS includes a radio frequency system, which provides the organization of satellite communication channels and operation of the station with Inmarsat-4 (I-4) satellites in the orbital slots 25 ° E and 64 ° E, antenna-feeder system of C- and L-bands, Radio Network System manufactured by Cobham SATCOM. Equipment of Ericsson, Cisco, HP, in turn, forms the core gateway network used for switching and connection to public networks, as well as Data Communication Network, which is responsible for routing and transmitting IP traffic, the relationship between the various subsystems and station elements. One of the main elements of the national SAS is the network monitoring system, designed and delivered by Inmarsat Global Ltd.

The Russian SAS “Marsat-4” is created in the village of Narynka of Klin district, Moscow region, where one of the two Russian Inmarsat land earth stations of the third generation is located.

In order to ensure optimal coverage of the Russian territory when working through the national gateway station, Inmarsat Global Company Ltd converted the I-4 satellite from the orbital slot 25 ° E to the orbital slot 64 ° E. According to the I-4 coverage map in the new orbital slot64 ° E, the satellite covers about 80% of the territory of the Russian Federation. Negotiations on the possibility of building another station based on the Morsviazsputnik LES in Nakhodka to operate via satellite at the orbital slot 143.5° E to cover the Russian Far East are held.

Alphasat coverage

Russian national BGAN SAS Marsat-4 is integrated into the Inmarsat terrestrial global network on the same principles as the previously built national SAS in China. Morsviazsputnik, as the national operator of the system, is responsible for the daily operation of the SAS in accordance with the procedures approved by Inmarsat Global Company Ltd., for coordination with the control centers of the Inmarsat network in London and Burum, for providing terrestrial connections and customers’ support. The objectives of Inmarsat Global Ltd are to coordinate the work of the Russian gateway with other terrestrial network stations, operating network procedures, management of spectrum allocation.

All traffic from the territory of the Russian Federation, including its territorial waters and airspace, is sent to the national SAS. Installation and acceptance of all the subsystems were completed in December 2015.

The National SAS was launched into operation in the II quarter of 2016.