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Industrial Automatic Control Systems and Controllers

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Hardware Implementation «One of Three» Logic in Spacecrafts Onboard Digital Computing Systems with the Adaptive Majority Reservation Schemes
L.V. Savkin

In article possibility of implementation «one of three» logic in onboard digital computing systems with the adaptive majority reservation schemes which are a part of spacecrafts onboard control complexes is considered. The present possibility is offered to be realized in the hardware way on the basis of earlier offered spacecraft onboard control complex reconfi gurable functional monitoring and diagnostics system. In the fi rst part of article the short review of most widespread majority reservation
of modern spacecrafts onboard digital computing systems is this. On the basis of classical triple reservation scheme with the one majority device and the three-layer majority reservation scheme examples leading «one of three» logic problem of implementation are shown. The main creation features and the functioning principles of the adaptive majority device capable are considered is the most effective in comparison with two previous schemes to solve a «one of three» logic problem. In the second part of article creation adaptive majority device as a part of functional monitoring and diagnostics system computing reconfi gurable duplicating fi eld area is offered. As the main method computing channels independent monitoring and testing is offered to use a Boolean derivatives method. It is offered to realize generation of inverse control functions input values and intermediate parameters in the functional monitoring and diagnostics system reconfi gurable test channels fi eld is a part. The expressions for identifi cation computing channels single-digit failure of on change Boolean derivatives values are received. It is shown that the «one of three» logic hardware implementation with simultaneous application computing channels tests with the Boolean derivative method of a is convenient in view direct access possibility to sets break points each of three independent computing channels due to use built-in monitoring scheme.
Keywords: onboard digital computing system; redundancy; reservation; hardware; adaptive majority device; reconfi guration; «one of three» logic; control; diagnostics.

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