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| Citation: | 
|
Broadband LFM Radar Imaging System Based on Microwave Photonic I/Q De-chirping
DOI: 10.12000/JR19002
More Information-
Abstract
We propose a novel scheme of broadband LFM radar imaging system based on microwave photonic I/Q de-chirping. In the transmitter, a broadband linear frequency modulated signal is generated by photonic frequency-doubling. In the receiver, echoes reflected from the target are simultaneously sent to a couple of modulators in two polarization states. After the bias voltage of the corresponding modulator is adjusted to introduce a 90° phase difference, photonic I/Q de-chirping reception of radar echoes is achieved. The proposed radar is capable of real-time high-resolution detection and can distinguish the target on both sides of a reference point. The range ambiguity problem caused by image interference in current radar with photonic de-chirping reception is solved. In this study, first, the necessity of I/Q de-chirping is demonstrated. Then, the structure and principle of the proposed photonic-based radar are introduced. A K-band radar with a bandwidth of 8 GHz is established, and an experiment on target detection and inverse synthetic aperture radar imaging is conducted. Results show that the system can effectively suppress the interference from image frequencies. -
References
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LI Zhi, TANG Chengyao, DAI Yongpeng, et al. Multirotor UAV-borne vital signs sensing using 4D imaging radar[J]. Journal of Radars, 2025, 14(1): 62–72. doi: 10.12000/JR24128
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- Figure 1. Schematic diagram of de-chirping
- Figure 2. The structure of photonic-based radar with I/Q de-chirping
- Figure 3. Spectrogram of transmitted signal
- Figure 4. Optical spectra of radar system
- Figure 5. Temporal waveforms and frequency spectra after I/Q de-chirping
- Figure 6. Experimental setup and the results of radar imaging