|START||NEW VOL 20||SEARCH||STATISTICS||PAS - GDANSK DIVISION|
pp. 25-28, vol. 3, 2000
Department of Remote Sensing and Monitoring Systems, Technical University of Gdańsk, Gdańsk, Poland
Abstract: The numerical simulations of echosounder signals scattering by fractally corrugated sea bed surface are presented. In particular, the relations between fractal dimension, describing the large scale roughness of sea bottom, and received echo envelope shape, were investigated. The fractal large scale relief of seabed surface was generated assuming the power law form of the spatial frequency power spectrum, with exponent related to fractal dimension, and subsequently applying the two dimensional inverse FFT algorithm. In the second stage, the bottom echo waveform was numerically modelled as an incoherent sum of contributing echoes from all surface elements. For each element, the echo amplitude was calculated assuming the form of angular dependence of bottom backscattering coefficient for small scale roughness. The obtained results of simulations have revealed same conditions for the transferring of the seabed surface fractal structure onto the shape of echo waveform.
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