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  • Received: Apr. 23, 2020

    Accepted: Sep. 11, 2020

    Posted: Oct. 23, 2020

    Published Online: Oct. 26, 2020

    The Author Email: Shangyuan Li (syli@mail.tsinghua.edu.cn)

    DOI: 10.3788/COL202018.123902

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    Shangyuan Li, Haidong Cao, Xiaoping Zheng. Concurrent photonic measurement of angle-of-arrival and chirp rate of microwave LFM signal[J]. Chinese Optics Letters, 2020, 18(12): 123902

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Chinese Optics Letters, Vol. 18, Issue 12, 123902 (2020)

Concurrent photonic measurement of angle-of-arrival and chirp rate of microwave LFM signal

Shangyuan Li*, Haidong Cao, and Xiaoping Zheng

Author Affiliations

  • Beijing National Research Center for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China

Abstract

A photonic approach to concurrently measure the angle-of-arrival (AOA) and the chirp rate of a linear frequency modulated (LFM) signal is proposed and experimentally demonstrated. The measurement is achieved by estimating the differential frequency of a two-tone signal output by a dual-parallel Mach–Zehnder modulator and an additional asymmetry Mach–Zehnder interferometer. Experiments show that the AOA and the chirp rate are measured simultaneously, with an AOA measurement error of ±0.1° at an signal-to-noise ratio (SNR) of 9.6 dB. When the SNR is -10.4 dB, the AOA error is ±1.3°, and the chirp rate, measured as 210.2±1.5 Hz/ps, has a standard deviation of 0.7%. The measured chirp rate agrees well with the real LFM signal.

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