Instantaneous frequency analysis of broadband LFM signals by photonics-assisted equivalent frequency sampling

• 作者: Yuewen Zhou Fangzheng Zhang Shilong Pan
• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: Microwave Photonics
• 页码范围: 106-110
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL202119.013901

摘要

We propose a photonics-assisted equivalent frequency sampling(EFS)method to analyze the instantaneous frequency of broadband linearly frequency modulated(LFM]microwave signals.The proposed EFS method is implemented by a photonic scanning receiver,which is operated with a frequency scanning rate slightly di什erent from the repetition rate of the LFM signals.Compared with the broadband LFM signal analysis based on temporal sampling,the proposed method avoids the use of high-speed analog to digital converters,and the instantaneous frequency acquisition realized by frequency-to-time mapping is also simplified since real-time Fourier transformation is not required.Feasibility of the proposed method is verified through an experiment,in which frequency analysis of Ka-band LFM signals with a bandwidth up to 3 GHz is dem-onstrated with a moderate sampling rate of 100 MSa/s.The proposed method is highly demanded for analyzing the instan-taneous frequency of broadband LFM signals used in radar and electronic warfare systems.