"KUPON" spacecraft of "Bankir" satellite communication and data transmitting system

The "KUPON" spacecraft is designed for data retranslation (data transmission, telefax, telephone) between subscribers of the satellite communication network. It was developed for the "Bankir" satellite communication and data transmitting system of the Central Bank of Russian Federation. The spacecraft was designed on the basis of the Lavochkin satellite communications. That has led to a decrease in terms of development and tests, cost of the spacecrafts and the entire communication system as well. The covering zone is formed by three S/C of the orbital system, each of them having on-board retranslation complexes (BRTK) working in Ku-band (14/11 GHz). Active phased antenna grids (AFAR) that can form up to 16 narrow receiving-transmitting beams, that can be retargeted to any undersatellite point in the limit of the S/C viewing area, are used, giving a possibility of changing the covering zones in the limits of the viewing area and to have flexible redistribution of the retranslator working ability. S/C injection into the staying points is performed by the three-staged "Proton" launch vehicle with the upper stage "DM" from the Baikonour launch site. In order to solve tasks of the on-board systems and also to perform control, diagnostics and recovery of the on-board systems, there is an on-board control complex (BKU), and in order to provide normal functioning of the BKU and BRTK for the execution of the input before the S/C tasks, there is an on-board control complex of service systems (BKOS).