convolution

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Related to convolution integrals: Faltung, convolving
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The kernel of the convolution integral in Eqs (20) and (21) corresponds to the standard viscoelastic model [22], which models both dispersion and relaxation effects.
A first method for calculating convolution integrals and sums of piecewise defined functions, was given in the papers [4] and [2].
Later, the often ray-tube integration called approach was employed for 2D ISAR image generation [8] and it was even recognized that the resulting convolution integrals can be efficiently evaluated by Fast Fourier Transform (FFT) based fast convolutions [9].