The Effect of OR Gating in the AN/SQS-26(XN-2).
TRACOR INC AUSTIN TX
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The purpose of this technical note is to describe the effect of using an OR gate to combine several channels of data. It is shown that the OR gate system is equivalent to a multiple channel system having an operator to observe each of the multiple channels simultaneously if the total false alarm rate is the same for each system. This does not preclude a loss in signal-to-noise ratio when the OR gate system is compared to only one channel of a multiple channel system, but this loss occurs because the single channel covers only a fraction of the signal-and-noise space covered by the OR gate system. An empirical equation for this loss in signal-to-noise ratio is developed from the results of a digital computer simulation of the OR gate system using recorded sea-test data. This empirical result is used to compare a single-channel system to a similar system in which the single channel is divided into multiple channels so as to improve the filtering, after which the channels are recombined through an OR gate. It is shown that the multiple channel system is superior to a single-channel system in the region of interest.
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