Scattering Characteristics Of Time-varying Sea Surface And Its Large Electrics Size Targets Based On TDSBR

The study of electromagnetic scattering characteristics of targets in complex sea background has important applications in radar imaging,target detection and identification.Experimental measurement is the most fundamental in the study of related problems,but experiments require a lot of human,material and financial resources.With the development of computer and computing technology,numerical simulation has become an important auxiliary method for complex ground and sea environments and target composite electromagnetic scattering research.During the simulation analysis,the time-varying characteristics of the dynamic sea surface,the Super electric size of the sea target(ship,aircraft carrier,etc.),the fine structure and the shaking of the ship on the sea surface make the electromagnetic scattering characteristics complex and changeable.The composite scattering characteristics of sea surface and its large electric targets are studied by timedomain high frequency method.The following is the main work of this article:(1)This paper first introduces several typical sea spectrum models,analyzes the influence of relevant factors on sea spectrum,studies the linear sea surface modeling methods,and analyzes the established one-dimensional and two-dimensional sea surface models.(2)Large ships above the Ku-band are often ultra-large size targets(often reaching more than 10,000 wavelengths),and the electric size after consideration of the sea surface is larger.To deal with the time-domain scattering problem of such a large size target,the traditional method needs a large amount of calculation.This paper introduces the basic principle and realization method of TDSBR based on analytical integral.By using the analytical integral method to increase the discrete surface element of the target on the integral unit,the calculation resource consumption is reduced and the calculation efficiency is improved.(3)In the process of implementing the TDSBR algorithm,it takes a lot of calculation time because of the intersection of the Ray and the target surface element.Considering that each Ray and the target surface element are independent of each other,this paper uses Open MP to accelerate the algorithm in parallel,which significantly reduces the calculation time.(4)At the end of the paper,the distribution of the element scattering field of the composite target model of electric large-size ships under different sea conditions is calculated and analyzed.The results are expected to be applied to the detection and identification of offshore targets.