Tilt compensation for acoustic transducing system
US4179682A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1978 |
| Grant date | Dec 18, 1979 |
| Priority date | — |
| Expiry date | Aug 3, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S3/805
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tilt compensated transducer array is provided with omni-directional transducers, compensated bi-directional transducers, and a processor which forms omni and bi-directional beams that are combined to cancel image lobes to give the array a uni-directional characteristic in which but a single, steerable main lobe is formed over a board range of steering angles. When the elements are located along a flexible line about which they naturally twist, a pair of orthogonally oriented bi-directional transducers is tilt or twist compensated to make image lobe cancellation possible. This is done by a compensator at each pair of bi-directional transducers which modifies their outputs in accordance with the deflection angle from the local vertical so as to obtain an output signal substantially the same as would be obtained by a single, properly oriented bi-directional transducer. Additionally, the use of a tilt compensated element permits discrimination of long range targets from short range targets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.