Yuewen Zhou, Fangzheng Zhang, Shilong Pan. Instantaneous frequency analysis of broadband LFM signals by photonics-assisted equivalent frequency sampling[J]. Chinese Optics Letters, 2021, 19(1): 013901
- Chinese Optics Letters
- Vol. 19, Issue 1, 013901 (2021)
Fig. 1. (a) Schematic diagram of the photonic-scanning-receiver-based microwave photonic frequency measurement system and (b) principle of the EFS.
Fig. 2. (a) Optical spectra of the signal after MZM1 and the signal after ODBF and (b) optical spectra of the signal after MZM2 and the signal after OBPF.
Fig. 3. Sampled waveform of the envelope signal when the SUT is a single-frequency signal at 31 GHz.
Fig. 4. (a) Sampled waveforms in four periods when measuring the LFM-SUT from 30 GHz to 33 GHz and (b) the measurement results obtained by the proposed method.
Fig. 5. Measurement results when the temporal period of the LFM-SUT is (a)
Fig. 6. Measurement results of the pulsed LFM-SUT with a negative chirp rate.
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