Chinese Optics Letters, 2023, 21 (7): 071201, Published Online: Jul. 26, 2023  

Intrapulse coherence degradation suppressing method of echo signal in coherent lidar

Author Affiliations
1 Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3 Department of Aerospace Laser Engineering, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Figures & Tables

Fig. 1. Relationship between frequency and time in T-FMCW.

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Fig. 2. Block diagram with I/Q receiver.

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Fig. 3. Workflow of the proposed method.

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Fig. 4. Processing results of the proposed method. (a) Iterative process of the frequency peak intensity of long-pulse echo signal; (b) frequency spectrum of the long-pulse echo signal with coherent degradation comparison before and after the proposed method.

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Fig. 5. Results of intrapulse coherence degradation suppression method for long-pulse echo signal with different random phase matching frequencies.

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Fig. 6. Field verification experiment scheme.

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Fig. 7. Optical transceiver and target scenario in the field verification experiment.

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Fig. 8. Real target scenario at a distance of 4.2 km from the coherent lidar.

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Fig. 9. Frequency spectrum and related results for the target at about 4.2 km. (a) Processing result of long-pulse echo signal with coherent degradation by the proposed method under different random phase-matching frequencies; (b) comparison of the frequency spectrum before and after being processed by this method.

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Fig. 10. Real target scenario at a distance of 19.8 km from the coherent lidar.

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Fig. 11. Frequency spectrum and related results for the target at about 19.8 km. (a) Processing result of long-pulse echo signal with coherent degradation by the proposed method under different random phase-matching frequencies; (b) comparison of the frequency spectrum before and after being processed by this method.

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Table1. Parameters of Simulation

NumberParameterValue
1Pulse period4 ms
2Intermediate frequency2 MHz
3Sampling rate20 MHz
4SNR0 (with phase noise)∼25 dB
5Random noise PSD5 µW/Hz
6Random frequency noise PSD10 × 103 Hz2/Hz
7Random phase-matching frequency250 Hz–50 kHz
8Number of iterations2000 times

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Table2. Experimental Parameters

NumberParameterValue
1PRF250 Hz
2Modulation bandwidth300 MHz
3Telescope diameter50 mm
4Transmission power1.6 W
5Target distance4.2 km/19.8 km
6Sampling rate250 MHz

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Haisheng Cong, Jianfeng Sun, Zhiyong Lu, Hongyu He, Weijie Ren, Yuxin Jiang, Lingling Xu, Chaoyang Li, Longkun Zhang, Zhengwei Zhang. Intrapulse coherence degradation suppressing method of echo signal in coherent lidar[J]. Chinese Optics Letters, 2023, 21(7): 071201.

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