Infrared and Laser Engineering, Volume. 49, Issue 11, 20200251(2020)
Adaptive Gaussian filtering of the full waveform of GF-7 satellite laser altimeter
Fig. 1. Background noise removal of full waveform data of GF-7 satellite laser altimeter
Fig. 2. Full waveform data, its noise and effective signal of GF-7 satellite laser altimeter
Fig. 3. 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
Fig. 4. Full waveform data of GF-7 satellite laser altimeter with a right-skewed peak
Fig. 5. 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
Fig. 6. Full waveform data of GF-7 satellite laser altimeter with an unsaturated flat peak
Fig. 7. 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
Fig. 8. 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
Estimation of the background noise of GF-7 raw full waveform
GF-7原始全波形背景噪声估计
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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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
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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Filtering of full waveform simulated with unsaturated flat peak
非饱和平峰模拟全波形的滤波
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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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
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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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
Category: Issue-Space-borne laser altimetry technology
Received: Jun. 24, 2020
Accepted: --
Published Online: Jan. 4, 2021
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