CAJ | 학술논문

作为信息载体的电磁波除了传统的携带信息方式外，近年来其波前以电磁涡旋形式展现的信息调制能力也越来越受到关注。本文综述了电磁涡旋在信息调制等方面的研究进展，阐述了其在雷达信息获取方面的潜在应用价值。针对圆形相控阵列，建立了电磁涡旋波照射下理想点散射目标的回波模型。将各阵元的接收信号按照与发射时相同的模式移相后，沿圆周积分即可获得雷达阵列的输出回波。该回波可表示为经平方 Bessel 函数调幅后的傅里叶基函数的线性组合。结合 Bessel 函数的频谱特性，分析了轨道角动量拓扑荷与方位角变量之间的近似对偶关系，利用逆投影和滤波-傅里叶变换方法进行了成像处理。仿真实验表明，电磁涡旋对雷达目标具有方位向成像的潜力。研究可为新体制的雷达设计、目标识别技术的发展提供参考和借鉴。
작위신식재체적전자파제료전통적휴대신식방식외，근년래기파전이전자와선형식전현적신식조제능력야월래월수도관주。본문종술료전자와선재신식조제등방면적연구진전，천술료기재뢰체신식획취방면적잠재응용개치。침대원형상공진렬，건립료전자와선파조사하이상점산사목표적회파모형。장각진원적접수신호안조여발사시상동적모식이상후，연원주적분즉가획득뢰체진렬적수출회파。해회파가표시위경평방 Bessel 함수조폭후적부리협기함수적선성조합。결합 Bessel 함수적빈보특성，분석료궤도각동량탁복하여방위각변량지간적근사대우관계，이용역투영화려파-부리협변환방법진행료성상처리。방진실험표명，전자와선대뢰체목표구유방위향성상적잠력。연구가위신체제적뢰체설계、목표식별기술적발전제공삼고화차감。
Amplitude /frequency/phase modulation of electromagnetic(EM)wave,as the common way of carrying information,has received intensive attention recently when the wave front acts as EMvortex for information modulation.The progress on the information modulation capability of EMvortex was systematically summarized and its potential on radar information acquisition was also introduced.Aiming at the circular phased array,the echo signal model of ideal point target was established under the illumination of EM vortex wave.Once the echo signal phase of each antenna element was shifted with the same mode as being applied for submission and integrated along the circular path,the output signal of the radar array can be obtained.The output signal can be modeled as the linear superimposition of Fourier basis with the amplitude modulated by squared Bessel function.According to the spectrum characteristic of Bessel function,the approximate dual relationship between the mode number of orbital angular momentum(OAM)and the variable of azimuthal angle was analyzed.Finally,the back projection(BP)algorithm and filtered FFT based algorithm were applied to image the target.Simulations show that electromagnetic vortex wave has the potential to acquire the cross-range profile of the radar target.The research may act as a reference for the design of new mechanism radar and the development of target recognition technology.