Eight additional new spacecraft types are currently in various stages of development, including the first proposed GEO communications spacecraft produced outside of the Applied Mechanics NPO. The next new spacecraft likely to appear will be Applied Mechanics' Arkos satellite, which will serve as the GE0 anchor of the Marathon telecommunications network while the highly elliptical Mayak spacecraft complete the system. Arkos spacecraft are specifically designed to service mobile (airland, and sea) and remote users.
The design of Arkos has evolved several times since the first concepts, and the present configuration relies upon the basic MSS-2500 bus (like Gals and Express), but the payload carries a phased-array primary antenna (two of the Mayak-class antennas). The spacecraft will carry a typical payload of three transponders for INMARSAT-compatible C-band and L-band communications. The full constellation will require five spacecraft positioned at 40 degrees, 90.5 degrees, 145.5 degrees, 200 degrees, and 346.5 degrees E. Arkos is expected to beat its Mayak sister satellite into orbit with a launch sometime in 1996 (References 262, 323, 329-330)..
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