Title :
A PC-based coherent sonar for experimental underwater acoustics
Author :
Kraeutner, Paul H. ; Bird, John S.
Author_Institution :
Dept. of Eng. Sci., Simon Fraser Univ., Burnaby, BC, Canada
fDate :
6/1/1996 12:00:00 AM
Abstract :
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
Keywords :
harmonic distortion; microcomputer applications; performance evaluation; phase noise; random noise; sonar signal processing; telecommunication computing; 25 to 500 kHz; A/D converter; ISA bus personal computer; PC-based coherent sonar; acoustic waveforms; bandpass signal; design; digital signal processing; linear-system model; magnitude errors; performance; phase errors; quadrature samples; simplicity; transmit/receive measurements; underwater acoustics; variable-frequency coherent sonar; versatility; wideband noise characterization; Acoustic waves; Computer errors; Demodulation; Digital signal processing; Instruction sets; Microcomputers; Signal design; Signal sampling; Sonar measurements; Underwater acoustics;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
