Main > HPArticle > Concurrent Photonic Measurement of Angle-of-Arrival and Chirp Rate of Microwave LFM Signal
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• Manuscript Accepted: Sep. 11, 2020

Online Published: Sep. 15, 2020

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 $\pm 0.1^\circ$ at an SNR of 9.6 dB. When SNR = -10.4 dB, the AOA error is $\pm 1.3^\circ$ and the chirp rate, measured as $210.2\pm1.5\ \rm{Hz/ps}$ has a standard deviation of $0.7\%$. The measured chirp rate agrees well with the real LFM signal.