Broad band interference sonar having compressed emission
US4794574A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 1985 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Oct 29, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S367/905
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.