Modelling pulse-to-pulse coherent Doppler sonar
Keywords:Acoustic wave backscattering, Acoustic wave propagation, Computer hardware, Data reduction, Doppler effect, Mathematical models, Velocity measurement, Pulse-to-pulse coherent Doppler sonar, Velocity structures, Volume backscatter
AbstractThe computer modeling of pulse-to-pulse coherent doppler sonar to generate pulse-to-pulse coherent backscatter data, is discussed. As the analysis of data generated by pulse-to-pulse coherent doppler sonar is complicated by occurrence of range and velocity ambiguities, system should be modeled before committing to hardware. Individual scatters are as modeled as randomly arranged point targets assigned a velocity from a prescribed velocity structure for accurately reproducing backscatter that retains a coherent component. The acoustic backscatter is constructed by adding up contributions of each target in the domain accounting for the source-target-receiver geometry and transducer beam patterns. Backscatter signal is later processed through analog receiver circuitry and digitized to create final sonar data. Model of acoustic backscatter based on point targets can reproduce volume backscatter that retains the critical characteristics of pulse-to-pulse coherent doppler sonar.
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