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Compared with scattering from a rough surface only,composite scattering from a target above a rough surface has become so practical that it is a subject of great interest.At present,this problem has been solved by some numerical methods which will produce an enormous calculation amount.In order to overcome this shortcoming,the reciprocity theorem(RT) and the method of equivalent edge currents(MEC) are used in this paper.Due to the advantage of RT,the difficulty in computing the secondary scattered fields is reduced.Simultaneously,MEC,a high-frequency method with edge diffraction considered,is used to calculate the scattered field from the cone-cylinder target with a high accuracy and efficiency.The backscattered field and the polarization currents of the rough sea surface are evaluated by the Kirchhoff approximation(KA) method and physical optics(PO) method,respectively.The effects of the backscattering radar cross section(RCS) and the Doppler spectrum on the size of the target and the windspeed of the sea surface for different incident angles are analysed in detail.
Compared with scattering from a rough surface only, composite scattering from a target above a rough surface has become so practical that it is a subject of great interest. At present, this problem has been solved by some numerical methods which will produce an enormous calculation amount . In order to overcome this shortcoming, the reciprocity theorem (RT) and the method of equivalent edge currents (MEC) are used in this paper. Due to the advantage of RT, the difficulty in computing the secondary scattered fields is reduced. Simultaneously, MEC, a high-frequency method with edge diffraction considered, is used to calculate the scattered field from the cone-cylinder target with a high accuracy and efficiency. The backscattered field and the polarization currents of the rough sea surface are evaluated by the Kirchhoff approximation (KA) method and physical optics (PO) method, respectively. These effects of the backscattering radar cross section (RCS) and the Doppler spectrum on the size of the target and the windspeed of the sea surface for different incident angles are analysed in detail.