Method and apparatus for improving the directional characteristi

Details Method and apparatus for improving the directional characteristi Method and apparatus for improving the directional characteristi

1976-03-09

1977-05-24

Farley, Richard A.

Communications: electrical

Selective

Monitoring in addition to control

340 6R, 343100LE, G01S 766, G01S 386, H04R 140

Patent

active

040258947

ABSTRACT:
A method and apparatus for improving the directional characteristic of an echo sounder receiving base, which includes a plurality of transducers arranged in a common plane, by means of multiplicative processing of output signals obtained from the signals received by the transducers from a submarine or underwater sound wave generator having a constant transmitting frequency. A plurality of output signals of different frequencies are derived from every signal received by each transducer with the same frequency as the transmitting frequency, with one output signal being of the transmitting frequency and with other output signals being of a higher and of a lower frequency than the transmitting frequency respectively. The output signals from all transducers of the same frequency are added together to form first, second and third group signals of the transmitting frequency, the higher frequency and the lower frequency respectively. The multiplicative processing includes a preliminary processing wherein the first group signal is multiplied with each of the second and third group signals and a second processing wherein the products of the preliminary processing are multiplied to provide the desired directional characteristic.

REFERENCES:
patent: 3170135 (1965-02-01), Yagelowich
patent: 3889227 (1975-06-01), Takamizawa et al.

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