Complete-polarization sea clutter simulation method

Abstract

The invention provides a complete-polarization sea clutter simulation method. The complete-polarization sea clutter simulation method comprises the following steps: simulating a random sequence with K distribution by an SIRP (Spherical Invariable Random Process) method and utilizing the random sequence with K distribution as the sea clutter of an HH (Horizontal-Horizontal) polarization channel; then simulating the sea clutter of a VV (Vertical-Vertical) polarization channel by utilizing the amplitude constraint and phase constraint relation between the HH polarization channel and the VV polarization channel; and finally simulating the sea clutter of a cross polarization channel by utilizing the constraint relation between the HH polarization channel and the cross polarization channel, so as to obtain the complete polarization scattering matrix of each scattering unit, so that the simulation of the complete-polarization sea clutter is realized. Simulation results indicate that complete-polarization sea clutter data obtained through simulation by utilizing the method provided by the invention can reflect sea phenomena such as sea peak, the constraint relations among the polarization channels satisfy the physical characteristics of the sea clutter under low sea conditions, and the simulation results can be used for subsequent applications.

Description

technical field [0001] The invention relates to a fully polarized sea clutter simulation method, which belongs to the field of radar echo simulation. Background technique [0002] The detection of sea surface targets is one of the important application fields of radar. However, due to the complex and changeable sea conditions and the diversity of sea surface influencing factors, the current sea surface simulation still faces many difficulties. It is mainly based on the statistical characteristics of sea clutter. At present, the statistical models commonly used to describe sea clutter include Rayleigh distribution, Weibull distribution, lognormal distribution, K distribution, etc. These distribution models are all descriptions in the statistical sense and do not involve to a specific radar polarization state, or considered to be the average result of different polarizations. With the continuous improvement of radar resolution, the K distribution is a distribution that can be...

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Problems solved by technology

[0004] Since the sea surface is not static but a dynamic process, it is difficult to establish a definite geometric model for the sea surface. Due to the sensitivity of the full polarization echo to the phase information between the polarization channels, it is difficult to directly apply the electromagnetic calculation method to the omnipolar The simulation of sea clutter also restricts the development of simulation analysis of fully polarized sea surface scattering characteristics, research on fully polarized sea surface target detection, etc.

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