Broad band interference sonar having compressed emission

Details Broad band interference sonar having compressed emission Broad band interference sonar having compressed emission

1985-10-29

1988-12-27

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Echo systems

367905, 367154, G01S 1502, H04R 132

Patent

active

047945745

ABSTRACT:
A system of emission array with several pairs of emitting transducers to emit simultaneously and covering contiguous frequency sub-bands of a band B. The sub-bands have a width which is less than or at most equal to the width inducing an acceptable displacement of the directivity lobes of the emission pattern of a pair of arrays. The emitters of a single pair are spaced by a distance of L.sub.i and emit signal pulses at frequency f.sub.i and of duration .tau..sub.e 1/.DELTA.f, the products L.sub.i f.sub.i being equal for all the pairs of emitters.
The emission patterns of the various pairs of emitters accordingly coincide precisely, and, as the emitters are supplied with signals emerging from the oscillators which are in phase at the center of the pulse of duration .tau..sub.e, the pulse resulting from the superposition of the emitted signals is compressed in time.

REFERENCES:
patent: 4234939 (1980-11-01), Grall
patent: 4510586 (1985-04-01), Grall et al.

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