Main > Chinese Optics Letters >  Volume 18 >  Issue 12 >  Page 123902 > Article
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Accepted: Sep. 11, 2020

Posted: Oct. 23, 2020

Published Online: Oct. 26, 2020

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

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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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## 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.