Infrared and Laser Engineering, Volume. 49, Issue 11, 20200251(2020)

Adaptive Gaussian filtering of the full waveform of GF-7 satellite laser altimeter

Zhiqiang Zuo1... Xinming Tang1,2, Guoyuan Li2 and Song Li1 |Show fewer author(s)
Author Affiliations
  • 1School of Electronic Information, Wuhan University, Wuhan 430072, China
  • 2Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China
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    Figures & Tables(12)
    Background noise removal of full waveform data of GF-7 satellite laser altimeter
    Full waveform data, its noise and effective signal of GF-7 satellite laser altimeter
    Types of the knuckle point in full waveform, and the red point is the current point (Current), the intensity is , the blue points are the chronologically adjacent with current point, and the intensities are and respectively: (a) and ; (b) and ; (c) and ; (d) and ; (e) and ; (f) and 离散全波形中折点类型,红色点为当前点(Current),强度值为,蓝色点为相邻时间的两个离散点(Former, Later),强度值分别为和:(a) 且;(b) 且;;(c) 且;(d) 且;(e) 且;(f) 且F
    Full waveform data of GF-7 satellite laser altimeter with a right-skewed peak
    Diagram of the left-skewed or right-skewed peak of the waveform peak in filtering window: the center point of the waveform in the filtering window is the red point, and the blue points are the adjacent points in the same filtering window. The waveform was divided into two parts with center point as the reference, and the α, β, γ, ψ, ω and θ are the slope angles calculated from the left and right parts respectively
    Full waveform data of GF-7 satellite laser altimeter with an unsaturated flat peak
    Filtering result of GF-7 satellite laser altimeter full waveform: (a) raw full waveform and the red line indicates the background noise value of waveform; (b) waveform filtering result of our proposed adaptive Gaussian filtering method; (c) sequences of standard deviation (SD) using the proposed adaptive Gaussian filter and fixed length Gaussian filters (the blue polyline, red line, and black line are corresponding to the standard deviation of adaptive Gaussian filter, fixed length (3.5 ns) Gaussian filter and fixed length (1.5 ns) Gaussian filter respectively); (d) waveform filtering result using average filter; (e) waveform filtering result using Gaussian filter of fixed length of 3.5 ns; (f) waveform filtering result using Gaussian filter of fixed length of 1.5 ns
    Peak simulation leveling of raw full waveform (without background noise) of GF-7 satellite laser altimeter, and the maximum amplitude of raw waveform is 58.33 mV while the amplitude of the leveling peak is 58.12 mV
    • Table 1.

      Estimation of the background noise of GF-7 raw full waveform

      GF-7原始全波形背景噪声估计

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      Table 1.

      Estimation of the background noise of GF-7 raw full waveform

      GF-7原始全波形背景噪声估计

      CaseTruth-value /mVProposed method /mVTypical method: mean intensity of sampling points (50, 100,150) at the end of the full waveform
      50 mV100 mV150 mV
      188.1888.1388.3588.3788.33
      288.1188.1188.1288.0788.00
      387.8988.1087.5087.4887.60
      488.0388.0287.9687.9587.98
      588.0188.0287.9087.9988.01
      688.1588.1188.1188.0888.09
      788.2288.2088.2588.1888.19
      887.9888.2887.6087.5387.42
    • Table 2.

      Evaluation of the full waveform filtering results of GF-7 satellite laser altimetry

      GF-7星载激光测高仪全波形滤波结果评价

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      Table 2.

      Evaluation of the full waveform filtering results of GF-7 satellite laser altimetry

      GF-7星载激光测高仪全波形滤波结果评价

      SNRVariation (compared with 30.87) of peak value of waveform 1Variation (compared with 27.87) of peak value of waveform 2Noise STD of filtered waveformIntensity STD of 100 points at the end of filtered waveform
      VariationUnknown environment 'document'(2.364) VariationUnknown environment 'document'(2.364)
      注:σNoise为原始波形仅去除背景噪声后的剩余零均值高斯白噪声的标准差,值为0.788;STD为标准差
      Proposed method19.872.23Yes1.83Yes0.2210.192
      Mean filtering17.356.04No2.42No0.2160.218
      Fixed-width Gaussian filtering (3.5 ns)18.54.79No1.8Yes0.2230.193
      Fixed-width Gaussian filtering (1.5 ns)19.403.82No1.54Yes0.2250.204
    • Table 3.

      Filtering of full waveform simulated with unsaturated flat peak

      非饱和平峰模拟全波形的滤波

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      Table 3.

      Filtering of full waveform simulated with unsaturated flat peak

      非饱和平峰模拟全波形的滤波

      Filtering resultsPeak location/nsPeak value/mVGaussian filtering parameters
      Unknown environment 'document' /mV Unknown environment 'document' /ns Unknown environment 'document' /ns
      Real waveform10658.3359.069106.1034.80
      Proposed method10657.5557.650106.0994.89
      Mean filter10654.9554.735106.165.19
      Gauss(3.5 ns)10655.9356.086106.165.06
      Gauss(1.5 ns)10656.5957.104106.1394.96
    • Table 4.

      Precision evaluation of the Gaussian decomposition of full waveform with simulated unsaturated flat peak (filtered using different methods)

      非饱和平峰模拟全波形滤波后高斯分解精度评价

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      Table 4.

      Precision evaluation of the Gaussian decomposition of full waveform with simulated unsaturated flat peak (filtered using different methods)

      非饱和平峰模拟全波形滤波后高斯分解精度评价

      Difference between Gaussian parameters with its corresponding truth-value
      Unknown environment 'document'Unknown environment 'document'Unknown environment 'document'
      MeanSTDMeanSTDMeanSTD
      Proposed method0.690.780.0070.0080.0260.023
      Mean filter4.373.350.0380.0270.3480.114
      Gauss (3.5 ns)2.372.400.0250.0190.1730.091
      Gauss (1.5ns)1.341.600.0230.0170.0840.064
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    Zhiqiang Zuo, Xinming Tang, Guoyuan Li, Song Li. Adaptive Gaussian filtering of the full waveform of GF-7 satellite laser altimeter[J]. Infrared and Laser Engineering, 2020, 49(11): 20200251

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    Paper Information

    Category: Issue-Space-borne laser altimetry technology

    Received: Jun. 24, 2020

    Accepted: --

    Published Online: Jan. 4, 2021

    The Author Email:

    DOI:10.3788/IRLA20200251

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