摘要
提出一种将目标高频电磁(EM)散射计算多径回波模型与不同海况条件下粗糙海面前向复反射系数模型相结合的方法,对海上舰船目标宽带雷达回波进行仿真和分析。简要分析了目标-海面相互作用的多径回波模型,给出了目标体的电磁散射计算方法,研究了不同海况条件下海面前向复反射系数随频率和擦地角的变化特性,并通过仿真分析了海面对舰船目标雷达回波的影响。对比分析舰船目标体直接散射及在不同海况条件下考虑多径效应时的雷达散射截面(RCS)变化特性,并在不同海况条件下对目标进行二维逆合成孔径雷达(ISAR)成像仿真,验证了本文方法的有效性。
A technique is proposed for wideband electromagnetic （EM） scattering simulation and analysis of ships over sea surfaces by combining a multipath model with a forward complex reflecting coefficient model of rough sea surfaces in different states. The multipath interaction between the target and the sea surface is briefly analyzed. The method of target EM scattering calculation is discussed. A study is performed of the impact of different sea states on the sea surface complex reflection coefficient as well as the variation of the coefficient with radar signatures scattered from the ship over the sea surface. By comparing the radar cross section （RCS） results of direct path and multipath calculated in different sea states, the influence of multipaths on the scattering of ships on the sea is analyzed. Two-dimensional （2-D） inverse synthetic aperture radar （ISAR） images in different sea states are presented, which demonstrate the validity of the current technique.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2009年第2期337-342,共6页
Acta Aeronautica et Astronautica Sinica
基金
国防预研项目
关键词
海上目标
特征信号
雷达散射截面
多径效应
电磁散射
target over sea surface
signature
radar cross section
multipath effect
electromagnetic scattering
