Azimuth adaptive phased array sonar

Details Azimuth adaptive phased array sonar Azimuth adaptive phased array sonar

1984-03-19

1986-12-23

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367905, G01S 380, G10K 1134

Patent

active

046317104

ABSTRACT:
In ultrasonic transmission from and reception by an array probe in a phased array sonar, when an ultrasonic beam is directed substantially in front of the array probe, an ultrasonic wave having a high center frequency f.sub.o, or a bandwidth extending into higher frequencies, is transmitted and/or received in order to insure a high image resolution. When the ultrasonic beam is steered sideways, an ultrasonic wave having a lower center frequency f.sub.o, or a higher frequency range cutoff in relation to a steering angle .theta., is transmitted and/or received in order to increase the angle at which grating lobes are generated and hence prevent such grating lobes from entering the angle range of the field of view.

REFERENCES:
patent: 3419845 (1968-12-01), Thiede et al.
patent: 4199246 (1980-04-01), Muggli
patent: 4478085 (1984-10-01), Sasaki

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