Minimalist Fault Masking, Detection and Recovery Techniques for Mitigating Single Event Effects in Spaceborne Microcontrollers

نویسندگان

  • Douglas Caldwell
  • David Rennels
  • D. W. Caldwell
  • D. A. Rennels
چکیده

This paper presents a design approach for implementing fault-tolerant embedded computing nodes in spacecraft using non-hardened, commodity microcontrollers. The approach uses faulttolerance to address high rate transient errors and occasional latch ups that are expected of such devices in the space radiation environment. A key constraint is to minimize the amount of external logic needed to support fault-tolerance so that the primary advantage of microcontrollers, high functional density, can be maintained. Low-cost approaches which leverage features of existing commercial microcontrollers are discussed. A built-in, high-speed serial port is used for voting among redundant devices and a novel wire-OR output voting scheme exploits the bidirectional controls of I/O pins. A fault-tolerant node architecture is presented, and the effectiveness of the faulttolerance techniques is discussed. A testbed is being constructed to verify the described techniques, using triplicated microcontrollers to control a 3-axis set of rate gyros, thereby providing a realistic application example.

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تاریخ انتشار 1998