APPLICATION OF SHAPING DECONVOLUTION TO THE GENERATION OF ARBITRARY ACOUSTIC PULSES WITH CONVENTIONAL SONAR TRANSDUCERS
✍ Scribed by P. Cobo
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 521 KB
- Volume
- 188
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
Conventionally, a transducer driven with an electrical tone burst responds with a pressure wave whose exact waveform is determined by the impulse response of the transducer and the physical properties of the medium to which it is coupled. However, for some active sonar applications it is often desirable to have very specific transmitted acoustic signals rather than simply gated or swept sinusoids. By modelling the underwater transducer as a linear filter and estimating its transfer function it is possible to derive the required time history of the input voltage for a given output spectrum. There is the complication that because the transducer is inevitably band-limited in its frequency response, a regularization parameter has to be introduced to avoid division by zero. The feasibility of the method is demonstrated by generating, with the same underwater transducer, zero-phase cosine-magnitude, bionic, Gaussian and low transient pulses. The input voltage necessary to generate each pulse is synthesized with a programmable arbitrary waveform generator. The main worth of this method is the versatility it affords in the use of conventional transducers.