Mikrowave Propagation Factor at Small Grazing Angle Over Sea

On the basis of analysis of extensive experimental data of our researches on the centimeter and millimeter radiowave propagation above a sea and land and results was formulated the conception that heights are single meters above a marine surface with agitation for description of the field it is necessary to utillize a diffraction model but not method of tangent plane (MTP). The lower limit bound of strict application of MTP is determined two criteria: 1. by absence of shadings of elements that reflect to a point observation of the field, its roughnesses; 2. by a limit on the minimum value of the glancing angle from the convex element of roughnesses. After such conclusion obtained from test data analysis, we have applied the proposed DCT based filter to processing real life X-band side look aperture radar (SLAR) images. Thus, we demonstrated that the proposed adaptive DCT-based filter is rather efficient for removing non-stationary noise in selected test applications.