Research on Electromagnetic Scattering Characteristics of Combined Conducting and Dielectric Target Above Coastal Environment

Abstract

The electromagnetic (EM) scattering characteristics of target above coastal environment are complicated due to the simultaneous existence of ground region and sea region. Nevertheless, the actual target possesses both conducting part and dielectric part. Such a composite scattering problem involves multiple media parameters and large amount of unknowns. Hence, aiming at accurately and efficiently calculating the EM scattering from combined conducting and dielectric target above coastal environment, the hybrid SIE-KA method is introduced in which single integral equation (SIE) method is utilized to reduce the number of combined target's unknowns and Kirchhoff approximation (KA) is applied to obtain induced electric and magnetic current on the surface of coastal environment. Moreover, multilevel fast multipole algorithm (MLFMA) is adopted to significantly reduce the computational cost and memory requirement. Several numerical examples demonstrate the accuracy and efficiency of the hybrid method. Finally, the EM scattering characteristics of combined conducting and dielectric target above coastal environment have been studied. The radar cross section (RCS) curves with different category of environment, polarization mode, working frequency, statistic parameters of coastal environment, permittivity of target's dielectric part, target's height and target category have been analyzed in detail to provide some useful conclusions. The approach and results can be broadly applied in remote sensing simulation of coastal environment with combined target. INDEX TERMSCoastal environment; electromagnetic scattering; Kirchhoff approximation; single integral equation; multilevel fast multipole algorithm; combined conducting and dielectric target

Composite Scattering Study of Layered Rough Surface withTarget based on CCIA

“…Zou [14] introduced the single integral equation-Kirchhoff approximation (SIE-KA) hybrid method with a multilevel fast multipole algorithm (MLFMA) to accelerate the computation to solve complex scattering problems in coastal environments containing conductor and dielectric targets, and presented many practical ideas in remote sensing. Liang [15] established a composite scattering model based on the propagationinside-layer expansion + generalized forward-backward method (EPILE+GFBM), studied the coupling mechanism between sea surface-missile-ship, and discussed the effects of different states of the target (such as attitude, position, and rotation angle) on the composite scattering characteristics.…”

A Fast Coupled Iterative Approach for Computing 3D Composite Scattering from Dielectric Rough Surfaces and Target

“…Modern warfare is a high-tech war with five dimensions: land, sea, air, sky, and electromagnetic, in which the electromagnetic scattering characteristics [10][11][12][13][14][15][16] of military targets and complex natural environments are important components of integrated sensory information on the battlefield. For example, when airborne or satellite radar detects and alerts military targets (such as aircraft and missiles) in the actual battlefield environment, its echo signal inevitably contains useless clutter signals reflected back from the natural environment, which will reduce the accuracy of target identification and increase the probability of false alarms.…”

Electromagnetic Scattering and Doppler Spectrum Simulation of Land–Sea Junction Composite Rough Surface

“…In [24][25][26][27][28], several methods have been proposed to solve electromagnetic scattering from a land-sea junction composite rough surface or a target located above a coastal environment. This paper has advantages over the literature cited previously.…”