Importance

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Abstract

A digital-to-analog converter provides a dc voltage to a fuze setting circuit which is proportional to the desired delay to be set. A digital controller operates the digital-to-analog converter responsive to the desired firing conditions for the fuze delay circuit. A current driver associated with the digital-to-analog converter converts the applied dc voltage to a constant current source, to charge a timing capacitor of the fuze delay circuit for an initial time interval. At two discrete points during this initial charging interval, the voltage across the timing capacitor is sampled and stored. The sampled voltages are applied to a computation circuit to correct for the variations in capacitance which are represented by this difference. Such correction is used to modify the currents supplied by the current driver of the fuze setting circuit to accurately charge a second, firing capacitor to the voltage which is necessary to establish a proper decay to the desired value for detonating an associated rocket or missile.

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First Claim