Indirect Dominant Mode Rejection: A Solution to Low Sample Support Beamforming

摘要

The work developed and described in this technical report deals with the problem of providing a statistical model of the backscattering from lake surface for low-grazing angle and high resolution radar systems. First described is a statistical analysis of the amplitude of the high-resolution polarimetric data characterized by different radar looking directions with respect to the wind blowing directions. Then, based on the electromagnetic two- scale model, analyzed were both the amplitude and frequency modulations induced on the small-scale Bragg resonant waves by the large-scale surface tilt and advection, due to the swell presence. Our results confirm the lake clutter non- stationary already found in previous analysis of other sea and lake clutter data. Moreover, the relationship between the variation of clutter spectral features, like texture, Doppler centroid and bandwidth, have been investigated by processing real recorded data. The data used for the research activity have been recorded by the IPIX radar of McMaster University in Grimsby, Ontario, Canada in 1998.