4.5 Article

A Simple Photonic System for DFS and AOA Simultaneous Measurement

Journal

PHOTONICS
Volume 9, Issue 12, Pages -

Publisher

MDPI
DOI: 10.3390/photonics9120980

Keywords

Doppler frequency shift; angle of arrival; microwave photonics

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Funding

  1. National Natural Science Foundation of China
  2. [61727815]

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A photonics-based dual-channel system is proposed for simultaneous measurement of the Doppler frequency shift and angle of arrival of microwave signals. The system demonstrates high precision with a DFS measurement error less than 0.4 Hz and AOA measurement error within 1.5 degrees.
A simple photonics-based dual-channel system is proposed to simultaneously measure the Doppler frequency shift (DFS) and angle of arrival (AOA) of microwave signals. The system applies two parallel push-pull Mach-Zehnder modulators (MZMs) for carrier suppression dual-sideband (CS-DSB) modulation. The introduction of the reference signal results in a DFS measurement without direction ambiguity. The DFS can be determined by measuring the frequency of the down-converted intermediate frequency (IF) signal, and the AOA can be calculated by comparing the phase shift of the two channels. A proof-of-concept experiment shows that the DFS measurement error is less than 0.4 Hz during +/- 100 kHz, and the AOA measurement error is within 1.5 degrees in a range of 0-70 degrees.

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