F. S. Vlasov, S. V. Arkusskaya, A. A. Terekhov

Computational process is organized with Information Transporting Service System (ITSS). The functions of ITSS are: 1) ruling computational process and communications; 2) controlling hardware operability during all stages of its lifecycle; 3) providing resiliency and reliable functioning of the system; 4) providing technological facilities for desinging and debugging software; 5) software verification on earth-based quality-control stations. The following aims were pointed during the design of the structure of computational process in controlling systems of a spacecraft: 1) providing the guaranteed strict real-time; 2) possible re-usage of already developed software for similar systems; 3) increasing the hardware-independency; 4) a possibility to reconfigure the system; 5) an ability of the system to function either in RTOS environment, or separately without any OS; 6) lowering the cost of software design, modification, support and maintainance. We choose blackboard systems as a basis of our system. The main elements in computational process organization are: - network objects database - control-flows (each software component is functioning in the control-flow mode). A control-flow is a unit of multi-program control; - drivers (software components which interact with I/O devices); - controlling program.