基于频率分集阵列的聚束SAR虚拟辐射源

Virtual radiation source of a spotlight SAR based on frequency diverse array

频率分集阵列作为一种新型阵列天线模型,无需移相器就可在空间实现波束扫描。基于频率分集均匀线阵模型,研究了聚束合成孔径雷达系统发射信号传输特性,引出了虚拟辐射源的概念,对其位置进行分析,与实际辐射源位置进行比较,可有效提高成像方位向分辨力,对于提高雷达隐身性能和进行电子欺骗也具有重要意义。计算机仿真实验验证了理论推导的准确性。

The Frequency Diverse Array（FDA） is a new type of array antenna which can perform beam scanning without phase shifters. The signal propagation feature of spotlight Synthetic Aperture Radar（SAR） is analyzed based on linear FDA. The location of the virtual radiation source is discussed and compared to the real radiation source. It can be used to improve cross-range resolution in spotlight SAR and is of great importance to radar stealth-technology and electronic deception. Simulation results have verified the accuracv of the theoretical derivation.