Abstract
A method is described which precisely and automatically compares the sensitivities of two hydrophones. The method is based on the property that the difference of two signals having equal average power is uncorrelated with the sum of the two signals. For two hydrophones placed in the same noise environment, a feedback circuit may be divised which adjusts the gain in one of the signal paths so that the required null correlation is achieved and maintained. The circuit may be analog, digital, or a hybrid combination of analog and digital. Frequency selectivity may be achieved with two identical filters. The method is particularly applicable to superdirective arrays since precise relative element weights may be achieved despite unknown or slowly changing hydrophone sensitivities. Under some circumstances data obtained with poorly weighted superdirective arrays may be improved after the telemetry and data recording operations have been completed.
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