摘要
在不同反射系数不同雷达载频下,利用方向图传播因子计算了远距离支援干扰压制区。借助雷达与目标之间以及雷达与干扰机之间的传播链路上的方向图传播因子,推导出信号干扰噪声比;利用渐削矩形口径,采取台阶余弦平方加权因式抑制背瓣的方法建立了天线模型;根据反射系数定义以及直射线和反射线的波程差得到了方向图传播因子的计算模型。仿真结果表明,多路径效应使得干扰压制区范围扩大,区域出现分裂现象;反射系数减小,暴露区域相应地缩减,但是暴露区的外形没有改变;雷达载频越高,方向图因子起伏越大,可借助宽带雷达载频的多样性来减轻或尽可能地利用多路径效应。
The blanketed zone of support jamming is computed by the pattern propagation factor （PPF） with different reflection coefficient and carrier frequency. The signal jamming noise ratio is concluded with the different reflectance on different propagation path. The antenna model is built with rectangular aperture, and a cosine-squared-on-a-pedestal is adopted to suppress the back lobe. The PPF calculation model is formed according to reflection coefficient definition and the wave path difference between the direct path and reflected path. The simulation results show that the jamming blanketed zone is extended for the multipath effect, and the zone is divided into parts. In addition, the exposed zone decrease with the decrease of reflection coefficient, but the shape of exposed zone does not change. And the higher the radar carrier frequency is, the greater the PPF fluctuation is. Analysis results indicate that the multipath effect can be lightened or utilized in virtue of the diversity of carrier frequency for the broad band radar.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2009年第1期9-12,共4页
Journal of University of Electronic Science and Technology of China
基金
国家自然科学基金(60271012)
