阵元与阵间频偏联合设计的FDA解模糊成像

Range-angle deblurring imaging of FDA based on joint design of intra-array and inter-array frequency offsets

与传统相控阵(phased array, PA)相比,频率分集阵列(frequency diverse array, FDA)可以通过发射窄带信号获得宽带观测效果。然而,FDA波束方向图的距离角度耦合会带来模糊问题,解决耦合问题成为FDA成像的关键问题之一。为解决耦合问题,提出了一种基于阵元内频率偏置和阵元间频率偏置联合设计的FDA结构,阵元内发射多组频率偏移不同的信号,并通过调整阵元内和阵元间的频率偏置将传输能量聚焦在期望的距离-角度区域来实现距离-角度解耦。利用所设计的FDA结构,无需依赖复杂的图像重建算法解决了目标的模糊性问题,实现多目标解除模糊成像。通过仿真实验结果验证了该模型对距离-角度解耦和目标解除模糊成像的有效性。

Compared to traditional phased arrays(PA),frequency diverse arrays(FDA)offer the advantage of wideband observation by transmitting narrowband signals.However,the range-angle coupling in FDA beamforming results in ambiguity issues,posing a significant challenge in FDA imaging.To address this coupling problem,this paper proposes a joint design of intra-element and inter-element frequency offsets in FDA,where multiple sets of signals with different frequency offsets are transmitted within each element.By adjusting the frequency offsets within and between elements,the transmitted energy is focused in the desired range-angle region,achieving range-angle decoupling.The designed FDA structure eliminates the ambiguity of targets without relying on complex image reconstruction algorithms,enabling multi-target range-angle decoupled imaging.Simulation experiments validate the effectiveness of the proposed model in range-angle decoupling and target ambiguity elimination.