基于双梳信道化的超宽带微波信号模拟时频分析与频率测量
Analog Time-Frequency Analysis and Frequency Measurement of Ultra-Wideband Microwave Signals via Dual-Comb Channelization
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中文总结 AI 辅助
该研究提出基于受激布里渊散射（SBS）的光子学辅助双梳信道化架构，实现超宽带微波信号时频分析与频率测量，获48/52 GHz带宽、微秒级时间分辨率及优于80 MHz的频率分辨率，为实时宽带频谱感知提供实用可重构方案。
中文摘要 AI 辅助
基于频率-时间映射（FTTM）的光子学辅助频谱感知可实现认知无线电、电子战等应用的宽带频谱监测。然而，这类方法在分析带宽、时间分辨率和频率分辨率之间存在权衡。尽管信道化技术已被引入以缓解这些权衡，但以往报道系统中可用信道数量有限，制约了整体性能的进一步提升。本文提出一种用于宽带频率测量和时频分析的光子学辅助双梳信道化架构。该系统采用基于受激布里渊散射（SBS）的步进频率泵浦产生光滤波梳，采用单激光器设计用于泵浦、探测和参考路径，以提高频率稳定性并降低系统复杂度。实验结果表明，该架构在16通道配置下实现48 GHz分析带宽，20通道配置下实现52 GHz分析带宽，同时具备微秒级时间分辨率和优于80 MHz的频率分辨率。因此，所提架构为实时宽带频谱感知提供了一种实用且可重构的解决方案。
英文摘要
Frequency-to-time mapping (FTTM)-based photonics-assisted spectrum sensing enables wideband spectrum monitoring for applications such as cognitive radio and electronic warfare. However, FTTM-based photonics-assisted spectrum sensing approaches involve trade-offs among analysis bandwidth, temporal resolution, and frequency resolution. Although channelization has been introduced to alleviate these trade-offs, the limited number of available channels in previously reported systems constrains further improvements in overall performance. Here, we propose a photonics-assisted dual-comb channelization architecture for broadband frequency measurement and time-frequency analysis. The system employs a stepped-frequency pump based on stimulated Brillouin scattering (SBS) to generate an optical filter comb and adopts a single-laser design for the pump, probe, and reference paths to enhance frequency stability while reducing system complexity. Experimental results show a 48-GHz analysis bandwidth in the 16-channel configuration and 52 GHz in the 20-channel configuration, together with microsecond-scale temporal resolution and a frequency resolution better than 80 MHz. The proposed architecture therefore offers a practical and reconfigurable solution for real-time wideband spectrum sensing.
