Adaptive Technique to Discriminate against Coherent Noise in a Narrow-Band System

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Abstract
It is shown how to use the mathematical method of steep descent to adjust the time delays and shading of an arbitrary array of hydrophones to increase the signal-to-noise ratio and to discriminate against coherent interference. Since the method requires only about 4M correlations at each step for each beam to which it is applied, where M is the number of hydrophones, it can probably be realized in real time in those narrow-band systems to which it is suited. The results of a computer modeling of the method are presented in which, by filtering the output of the hydrophones of a 23-element array, it is found possible to eliminate the effect of an interfering signal 40 dB stronger than the desired signal and offset by 15° from it in bearing.

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