Computation of the Spatial Correlation of the Ocean Surface, via the FFT.
NAVAL UNDERWATER SYSTEMS CENTER NEWPORT R I
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The statistical properties of signals reflected from the ocean surface depends on the stochastic properties of the surface. An example of this is the prediction of the average energy reflected from the surface as a function of angle of incidence. To evaluate this quantity, it is necessary to know the spatial correlation of surface heights. Measurements or assumptions of the directional wave spectrum of the ocean are first obtained. The spatial temporal correlation of the ocean surface is expressed in terms of this directional wave spectrum. This memorandum describes a method of evaluating this expression by means of the Fast Fourier Transform FFT. Since the FFT method is much faster than the usual numerical integration method, it is highly desirable for experimental data. This memorandum presents the first known evaluation of surface spatial correlation by the FFT method. Author
- Statistics and Probability
- Computer Programming and Software