Weapon arming system and method

An arming system (10) for a weapon, such as a missile, includes a pair of logic elements (14,16) that output different types of signals (24,26) upon the occurrence of different prearming events. The different types of signals (24,26) may be, for instance, signals at different frequencies. The different signals (24,26) are combined in a mixer (36). The mixed combined signal (40) may be processed by passing it though elements such as a band pass filter (44) and/or a pulse-width modulator/controller (46). An arming switch (48) is configured to initiate arming when a predetermined condition in the combined signal (40) is detected, such as the presence of a frequency in the combined signal (40) at the difference between the frequencies of the individual signals (24,26) from the logic elements (14,16). By basing arming on characteristics of a mixed combined signal (40) from two logical elements (14,16), there are no credible single-point failure modes in the arming system (10).