ABSTRACT

So far, implementations of frequency-diverse computational framework with metamaterial element have used a frequency sweep across the operating frequency band, where the driving waveguide mode is coupled to subsets of the resonant elements at a corresponding excitation frequency. Scene information interrogating and processing efficiency are relatively confined in current imaging system especially for far-range imaging scenarios. Here, we implement frequency-division methods to parallelize computational imaging (CI). This concept multiplexes the modes in the frequency domain where different subsets of the resonant metamaterial elements are simultaneously excited by wideband multicarrier waveforms, allowing the scene to be encoded with different spatially diverse radiation patterns. Besides, we present a unified fast perception and processing framework for far-range imaging purpose. The proposed technique marries communications concepts to computational imaging, achieving a key development due to the limitations imposed by massive amount of data and burdensome computation. Numerical simulations with the measured radiation field pattern data are conducted to verify the effectiveness the technique.

摘要

到目前为止，具有超材料元件的频率分集计算框架的实现已经使用了跨越工作频带的频率扫描，其中驱动波导模式以相应的激发频率耦合到谐振元件的子集。目前的成像系统，尤其是远距离成像场景，场景信息的查询和处理效率相对有限。在这里，我们实现了频分方法来并行化计算成像 (CI)。这个概念在频域中复用模式，其中谐振超材料元素的不同子集同时被宽带多载波波形激发，从而允许使用不同的空间不同辐射模式对场景进行编码。除了，我们提出了一个统一的快速感知和处理框架，用于远距离成像。所提出的技术将通信概念与计算成像结合起来，由于大量数据和繁重的计算所带来的限制，实现了关键的发展。用测量的辐射场方向图数据进行数值模拟，以验证该技术的有效性。