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A PC-based coherent sonar for experimental underwater acoustics

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2 Author(s)
Kraeutner, P.H. ; Dept. of Eng. Sci., Simon Fraser Univ., Burnaby, BC, Canada ; Bird, J.S.

An important tool for experimental underwater acoustics research is a versatile sonar system for transmitting, receiving, anti recording acoustic waveforms. In this paper the design, implementation and performance of a variable-frequency (25 kHz to 500 kHz) coherent sonar are presented. The significance of the design lies in its simplicity and versatility. These attributes are a result of a sampling technique that provides quadrature samples of the complex envelope of a bandpass signal without analog demodulation using a single A/D converter. Implementation of the design is accomplished using an ISA bus personal computer (PC), a commercially available digital signal processing (DSP) board, and a small amount of custom electronics. Performance of the sonar, in terms of magnitude and phase errors, is determined from wideband noise characterization, a linear-system model, and transmit/receive measurements

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Instrumentation and Measurement, IEEE Transactions on  (Volume:45 ,  Issue: 3 )