Author(s): Li, XT (Li, Xintong); Tao, JM (Tao, Jinming); Li, JY (Li, Jinye); Jia, QQ (Jia, Qianqian); Wang, CQ (Wang, Chaoquan); Liu, JG (Liu, Jianguo)

Source: PHOTONICS Volume: 9 Issue: 12 Article Number: 980 DOI: 10.3390/photonics9120980 Published: DEC 2022

Abstract: 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.

Accession Number: WOS:000904148300001

eISSN: 2304-6732

Full Text: https://www.mdpi.com/2304-6732/9/12/980