相位调制表面雷达回波特性研究

A Study on Signature of Radar Echo From a Phase-switched Screen

作为一种新型的人工周期结构材料，相位调制表面（PSS）在雷达目标隐身方面有良好的应用。文中以线性调频信号为例，建立了回波模型并详细分析了其回波特性。首先，阐述了相位调制表面的基本工作原理，建立了雷达回波模型；然后，应用雷达信号模糊函数理论研究了回波的匹配滤波输出，分析了输出峰值点的幅度、相位及空间分布特性，推导了关键因素对滤波输出的影响；最后，进行了相应的仿真验证。结果表明，就对雷达系统的影响而言，相位调制表面具有与间歇采样转发干扰相似的效应，但同时它还具备一些有源方式难以比拟的优点，这使其可望在雷达对抗、目标特性控制等方面有良好的应用前景。

As a novel manual period structure material, the phase-switched screen （ PSS } has been proved effective in the applica- tion of shielding a radar target. In this paper, the model of the PSS echo is established by liner frequency modulation （LFM） and its properties is analyzed in detail. Firstly, the essential principles of PSS are expounded, the model of PSS echo is first estab- lished. Secondly, the matched-filtering output of PSS echoes is investigated using radar ambiguity function theory. The amplitude, phase and distribution properties of output peaks are analyzed, respectively. The influence of key factors on the filtering output is deduced. Finally, simulation is conducted to verify the theory. The research results show that PSS has a similar effect on radar sys- tem compared with the interrupted-sampling repeater jamming （ ISRJ ）. In addition, PSS has uncontested advantage over active jamming, which provides a very wide application foreground in the areas such as radar countermeasure and target scattering-property control.