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This paper proposes a novel integral sliding mode on-line control allocation scheme for fault tolerant control. The order of the sliding motion in the sliding mode is not reduced as in conventional sliding mode schemes. Also the robustness of the closed loop system can be guaranteed throughout the entire response, starting from the initial time instant, because there is no reaching phase. Actuator...
Fault-tolerance in an interconnection network is very important for its continuous operation over a relatively long period of time. Fault-tolerance is the ability of the system to continue operating in the presence of faults. In this paper a new irregular network IABN has been proposed and an efficient routing procedure has been defined to study the fault tolerance of the network. The behavior of...
Present and future semiconductor technologies are characterized by increasing parameters variations as well as an increasing susceptibility to external disturbances. Transient errors during system operation are no longer restricted to memories but also affect random logic, and a robust design becomes mandatory to ensure a reliable system operation. Self-checking circuits rely on redundancy to detect...
The purpose of TAFT fault tolerance studies conducted at CNES is to prepare the space community for the significant evolution linked to the usage of COTS components for developing spacecraft supercomputers. CNES has patented the DMT and DT2 fault-tolerant architectures with 'light' features. The development of a DMT/DT2 testbench based on a PowerPC7448 microprocessor from e2v is presented in this...
Process scaling is well know to increase overall chip-level soft error rates (SER) if no additional mitigation techniques are applied [Seifert04]. The purpose of this study is to summarize recent investigations conducted by the author to characterize the SER benefits and limitations of one particular SER mitigation technique: radiation hardened sequentials that utilize local redundancy. The studied...
In this paper a BISR architecture for embedded memories is presented. The proposed scheme utilises a multiple bank cache-like memory for repairs. Statistical analysis is used for minimisation of the total resources required to achieve a very high fault coverage. Simulation results show that the proposed BISR scheme is characterised by high efficiency and low area overhead, even for high defect densities...
Encryption algorithms could suffer fault injection attacks in order to obtain the secret key. In this paper, a specific protection for any round-based encryption algorithm is presented, analyzed and tested. It is providing a high degree of robustness together with a small penalty in the algorithm throughput when dealing with specific intentional attacks. Experimental results on advanced encryption...
Space robot reliability is a fatal important problem. Any fault and error may damage spacecraft. This paper suggests a space robot system with two alternate drive system, two alternate control system, redundant freedom, two alternate communicate system. The space robot is a fault-tolerant system. Fault tree is used to analysis space robot. Any one element on the space robot fault doesnpsilat influence...
This paper presents a distributed fermat-point range estimation strategy, which is important in the moving sensor localization applications. The fermat-point is defined as a point which minimizes the sum of distances from three sensors inside a triangle. This point is indeed at the trianglepsilas center of gravity. We solve the problems of large errors and poor performance in the bounding box algorithm...
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