Parallel computing method for time-varying multi-scale electrically-large-area sea-surface electromagnetic scattering vector field

Abstract

The invention discloses a parallel computing method for a time-varying multi-scale electrically-large-area sea-surface electromagnetic scattering vector field. The method comprises the following steps: building a gravity wave sea-surface model; determining a cutoff frequency k<c> of gravity waves and tension waves, solving coherent scattering under the gravity waves through Kirchhoff, and approximately solving Bragg scattering of the tension waves through small disturbance; modulating a tension wave spectrum through the gravity waves to obtain a vector filed of the tension waves under surface elements; making a surface element shielding judgment through a Z-BUFFER method; and determining an amplitude and a phase of the vector field under the surface elements according to a vector overlapping principle of the field. According to the method, the tension waves are modulated through the gravity waves on the basis of the characteristics that the tension wave spectrum is modulated through the gravity waves and an electrically-large-area rough sea surface has a time-varying multi-scale echo characteristic, and a scattering field and a Doppler spectrum of the large-area rough sea surface are computed in parallel through the Kirchhoff and a small disturbance approximation method in conjunction with CUDA (Compute Unified Device Architecture), so that radar echo characteristic analysis of the time-varying multi-scale electrically-large-area rough sea surface is realized.

Description

technical field [0001] The present invention relates to a time-series calculation method of time-varying multi-scale sea surface electromagnetic scattering vector field in electric large area, adopting the parallel calculation method of time-varying multi-scale electric large area sea surface electromagnetic scattering vector field time series based on gravity wave modulation tension spectrum, and gravity wave modulation The high-frequency approximation method of tension spectrum can solve the time series of sea surface vector field in electrically large areas, and parallel computing can improve computational efficiency. Background technique [0002] The study of electromagnetic scattering plays an extremely important role in the fields of remote sensing, target detection and tracking, and SAR imaging on the ocean. The traditional high-frequency calculation method of electromagnetic scattering on the sea surface has always been to obtain the total echo of the sea surface by c...

AI Technical Summary

Problems solved by technology

With the increase of the sea surface area, the subdivision bins of the sea surface also increase, which restricts the modeling of the time series of the scattered field vector of the sea surface in the time-varying electric large area. The time series characteristics of multi-scale rough sea surface scattering vector field have not been reported yet

Images