Mulyak O. Reliability models of hardware/software radio system with version-structural redundancy.

This thesis aims to solve scientific task in increasing the credibility of indexes of reliability of hardware and software systems (HSS) of the radioelectronic systems with version-structural redundancy, multiple software updates in service and automatic restart. These HSS are a part of repairable and non-repairable in the hardware part radioelectronic systems for long-term, continuous operation. Increasing credibility of reliability indexes is approached through the development of new and improvement of well-known models of fault-tolerant reliability HSS. Specifically, this thesis: (1) develops a new reliability model of HSS with non-repairable hardware part, this HSS include main and reserve subsystem which consists of identical modules, the reliability model also provides for double software updates (updates software starts after commissioning of the radioelectronic system) and automatically restart; (2) develops a improvement reliability model of HSS with non-repairable hardware part, this HSS include main and reserve sub-system which is fault-tolerant with the majority structure with rule of voting "2-of-3". This model includes the use of different versions of software for the main and reserve sub-system of the HSS, software upgrades that begin after the identification of a defect in the operation of radioelectronic systems, also included automatic software restart; (3) develops a improvement reliability model of HSS with repairable hardware part, the structure of which includes main and reserve multiprocessor sub-systems and sliding redundancy of the processors and includes the use of different versions of software for the main and reserve sub-systems, also model include automatic restart after software failure; (4) develops a improvement reliability model of HSS with repairable hardware part, built on the principle of majority rule voting with choice and appropriate choice of the number of kernel modules, and which also includes automatic restart after a software failure in the operation of radioelectronic systems, and models moving backup kernel modules. The suggested models of fault-tolerant HSS radioelectronic systems with version-structural redundancy allow us to establish which are the most reliable parametric syntheses by finding compromise solutions, selecting the failover HSS and via a comparative study of their reliability.