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  • Received: Jul. 10, 2020

    Accepted: Sep. 4, 2020

    Posted: Nov. 20, 2020

    Published Online: Dec. 7, 2020

    The Author Email: Fangzheng Zhang (zhangfangzheng@nuaa.edu.cn)

    DOI: 10.3788/COL202119.013901

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    Yuewen Zhou, Fangzheng Zhang, Shilong Pan. Instantaneous frequency analysis of broadband LFM signals by photonics-assisted equivalent frequency sampling[J]. Chinese Optics Letters, 2021, 19(1): 013901

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Chinese Optics Letters, Vol. 19, Issue 1, 013901 (2021)

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

Yuewen Zhou, Fangzheng Zhang*, and Shilong Pan

Author Affiliations

  • Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Abstract

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 different 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 Kα-band LFM signals with a bandwidth up to 3 GHz is demonstrated with a moderate sampling rate of 100 MSa/s. The proposed method is highly demanded for analyzing the instantaneous frequency of broadband LFM signals used in radar and electronic warfare systems.

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