Abstract
We propose a system for the simultaneous measurements of Ka-band microwave angle of arrival (AOA) and Doppler frequency shift (DFS) based on a high-speed silicon dual-parallel Mach-Zehnder modulator (Si-DPMZM).. An echo signal drives a sub-MZM while the combination of a phase-delay echo signal and a transmitted signal drives the other sub-MZM. Two optical bandpass filters (OBPFs) are used to select the upper and lower sidebands of the Si-DPMZM output signal, detected by low-speed photodiodes, then generating two intermediate frequency (IF) signals. Thus, both AOA and DFS (with direction) can be obtained by comparing the powers, phases and frequencies of these IF signals. The estimation error of measured AOA is less than ±3° from 0 to ±90°. Meanwhile, the DFS at 30/40 GHz were measured with an estimated error of less than 9.8 × 10−10 Hz within ±1 MHz. In addition, the fluctuation of DFS measurement is less than 3 × 10−11 Hz within 120 minutes, indicating the high stability of the system.
Funder
National Key Research and Development Program of China
Science and Technology Innovation 2025 Major Project of Ningbo
Zhejiang Lab Research Funds
Science and Technology Plan Project of Zhejiang
Subject
Atomic and Molecular Physics, and Optics
Cited by
1 articles.
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