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Acta Optica Sinica, Volume. 41, Issue 4, 0401004(2021)

Elimination of Backscatter Noise of Underwater LiDAR Using Independent Component Analysis Algorithm

Ruoyi Qi1,2, Kun Li1,2, Suhui Yang1,2、*, Yanze Gao1,2, Xin Wang1,2, and Zhuo Li1,2
Author Affiliations
  • 1School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
  • 2Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, Beijing 100081, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (9)
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    References (23)
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    Figures & Tables(9)
    General steps of ICA

    Fig. 1. General steps of ICA

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    Received signal

    Fig. 2. Received signal

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    Received signals at modulation frequency of 225 MHz and 675 MHz

    Fig. 3. Received signals at modulation frequency of 225 MHz and 675 MHz

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    Signal separated by ICA. (a) Target echo signal; (b) backscattering noise

    Fig. 4. Signal separated by ICA. (a) Target echo signal; (b) backscattering noise

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    Results by ICA

    Fig. 5. Results by ICA

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    Comparison of calculated results with theoretical values, target depth from 1 ns to 100 ns, detector pulse center from 10 ns to 60 ns. (a) 10 ns; (b) 20 ns; (c) 30 ns; (d) 40 ns; (e) 50 ns; (f) 60 ns

    Fig. 6. Comparison of calculated results with theoretical values, target depth from 1 ns to 100 ns, detector pulse center from 10 ns to 60 ns. (a) 10 ns; (b) 20 ns; (c) 30 ns; (d) 40 ns; (e) 50 ns; (f) 60 ns

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    Comparison of calculation results with theoretical values under different target depths in condition of fixed detector pulse center

    Fig. 7. Comparison of calculation results with theoretical values under different target depths in condition of fixed detector pulse center

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    Comparison of calculation results under different target depths. (a) 60 ns

    Fig. 8. Comparison of calculation results under different target depths. (a) <30 ns; (b)>60 ns

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    • Table 1. Simulation parameters

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      Table 1. Simulation parameters

      ParameterValue
      Seawater attenuation coefficientα=0.2 m-1
      Speed of light in sea waterv=2.25×108 cm·s-1
      Backscatter timesN=104
      Backscatter rate in sea waterρb=0.06
      Underwater target reflectivityρt=0.2
      Transmit pulse center delayt0=50 ns
      Seawater depth (corresponding time)td=150 ns
      Modulation frequencyfm=225 MHz
      Modulation depthm=1
      Sampling intervalts=0.25 ns
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    Ruoyi Qi, Kun Li, Suhui Yang, Yanze Gao, Xin Wang, Zhuo Li. Elimination of Backscatter Noise of Underwater LiDAR Using Independent Component Analysis Algorithm[J]. Acta Optica Sinica, 2021, 41(4): 0401004

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    Paper Information

    Category: Atmospheric Optics and Oceanic Optics

    Received: Jul. 1, 2020

    Accepted: Sep. 28, 2020

    Published Online: Feb. 25, 2021

    The Author Email: Suhui Yang (suhuiyang@bit.edu.cn)

    DOI:10.3788/AOS202141.0401004

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology