摘要
分析宽带雷达条件下目标的散射特性,由局部性定理可知扩展目标的电磁散射特性可由不同散射中心表示。采用基于几何绕射理论的GTD散射中心模型描述目标高频电磁散射特性,提取散射中心参数,给出宽带雷达目标回波仿真方法,将目标散射特性与雷达发射信号进行计算得到典型目标基带回波信号。以某战机为例,利用提取的散射中心参数,重构宽带雷达目标回波信号,并对模拟的回波信号匹配滤波得到目标一维距离像。分析了一维距离像的展宽与偏移并得到精确一维距离像,该距离像真实地反映了目标散射中心的距离信息和归一化幅度信息。
The scattering properties of wide-band radar target are analyzed in this paper. The elec-tromagnetic scattering characteristics of target are composed of many separate scattering centers by the lo-cal theorem. The target scattering characteristics is restructured based on geometrical theory of diffraction（GTD） scattering centers model, and the parameters of the scattering center are extracted. An approachfor wide-band radar target echo simulation is proposed. The wide-band radar target echo is reconstructedin real-time by convolve the radar transmitting signal to the radar target scattering characteristics. Thetime-domain echo of a certain aircraft is restructured according to parameters of the target scattering cen-ters. High-resolution range profile （HRRP） is given by pulse compression algorithm. After analyzing thebroaden and the excursion of HRRP, a more accurate HRRP is achieved, which can reflect the actual dis-tance distribution and the normalized amplitude of wide-band radar target scattering centers.
出处
《航空兵器》
2015年第2期34-37,54,共5页
Aero Weaponry
关键词
目标散射中心
回波信号
脉冲压缩
一维距离像
target scattering center
echo base-band signal
pulse compression
high-resolutionrange profile
