Junling Sun, Pengge Ma, Qingyuan Guo, Hongyin Han, Wei Li, Ran Tao. Target echo denoising algorithm of airborne platform multi pulse laser rangefinder under low SNR[J]. Infrared and Laser Engineering, 2021, 50(6): 20210005
- Infrared and Laser Engineering
- Vol. 50, Issue 6, 20210005 (2021)
![Propagation process of laser pulse signal in atmospheric channel[1]](/richHtml/irla/2021/50/6/20210005/img_1.jpg)
Fig. 1. Propagation process of laser pulse signal in atmospheric channel[1]
Fig. 2. Waveform of echo signal with different pulse width
Fig. 3. Empirical Mode Decomposition of the pulse laser echo signal. (a) IMF-1; (b) IMF-2; (c) IMF-3; (d) IMF-4; (e) IMF-5; (f) IMF-6; (g) IMF-7; (h) Residual
Fig. 4. Results of the echo signal denoised by EMD. (a) Emitting laser waveform; (b) Echo signal; (c) Result of the echo signal denoised by EMD algorithm
Fig. 5. Results of the echo signal denoised at SNR=−15 dB by various denoising methods. (a) Emitting signal; (b) Echo signal; (c) Result of the echo signal denoised by SF algorithm; (d) Result of the echo signal denoised by WRD algorithm; (e) Result of the echo signal denoised by EMD algorithm
Fig. 6. Performance evaluation of pulse laser rangefinder based on extinction ratio method in outfield
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Table 1. The least SNR detected by various denoising algorithms
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Table 2. The estimation error of the peak point position by different signal processing algorithms
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