基于植被表面的激光测高仪回波波形模型化分析

针对激光测高仪中发射的激光脉冲并不是高斯对称的, 并且由于目标物的影响, 使用一系列标准高斯函数的和来拟合回波脉冲并不精确, 本文提出改变回波分解的取模模型, 通过正确模型的选取来改善回波位置的精确度。该方法采用比高斯函数复杂的对数正态函数和广义高斯函数, 采用 LM非线性拟合算法拟合回波波形。实验结果表明, 通过对植被等回波数据的拟合显示出针对不同的地形存在不同的改善效果, 同时新参数的引入可获得波形的额外信息, 使得对目标物表面几何形状、反射率和粗糙度等信息的解算变得更为容易。Waveform Based on Canopy Surface

Abstract

It has been demonstrated that decomposing the return waveforms into a mixture of Gaussian components was suitable to achieve the information of the target. But the laser impulse is slightly asymmetric, and approximating the waveforms by using a sum of Gaussians may not be an accurate representation depending on the application and target. This paper focus on the improvement of raw signal modeling and re.ne peak detection greatly increased the number of detected targets as well as their positional accuracy. More complex models than the Gaussian model, such as the Lognormal or generalized Gaussian functions, were introduced and. tted with backscatter waveform of canopy to improve the raw signal by LM algorithm. The results show, through introduction of new echo parameters, it is easy to extract the additional information on the target shape, and calculate reflectivity and roughness.

参考文献

[1] Guenther G, Mesick H. Analysis of airborne lidar bathymetric waveforms [C]// Proc. of SPIE Ocean Optics IX, Orlando, United States, 1988: 232–241.

[2] Harding D, Lefsky M, Parker G. Laser altimeter canopy height pro.les. Methods and validation for closed-canopy broadleaf forests [J]. Remote Sensing of Environment(S0034-4257), 2001, 76(9): 283–297.

[3] Zwally H, Schutz B, Abdalati W, et al. ICESat’s laser measurements of polar ice, atmosphere, ocean, and land [J]. Journal of Geodynamics(S0264-3707), 2002, 34(3): 405–445.

[4] 郭冠军, 焦威严, 曲士良, 等. 脉冲展宽对机载激光扫描仪性能的影响 [J].光电工程, 2010, 37(3): 51–55.

GUO Guan-jun, JIAO Wei-yan, QU Shi-liang, et al. Effect of Pulse Spreading on the Ranging Performance of Airborne Laser Scanner [J]. Opto-Electronic Engineering, 2010, 37(3): 51–55.

[5] 闫小伟, 邓甲昊, 孙志慧. 脉冲激光成像探测系统回波信号仿真 [J].光电工程, 2009, 36(12): 42–46.

YAN Xiao-wei, DENG Jia-hao, SUN Zhi-hui. Simulation of Echo Signal in Laser Imaging Detection System [J]. Opto-Electronic Engineering, 2009, 36(12): 42–46.

[6] 李松, 周辉, 石岩. 激光测高仪的回波信号理论模型 [J].光学精密工程, 2007, 15(1): 33–39.

LI Song, ZHOU Hui, SHI Yan, et al. Theoretical model for return signal of laser altimeter [J]. Optics and Precision Engineering, 2007, 15(1): 33–39.

[7] Hofton M, Minster J, Blair J, et al. Decomposition of Laser Altimeter Waveforms [J]. IEEE Transactions on Geosciences and Remote Sensing(S0196-2892), 2000, 38(4): 1989–1996.

[8] Persson A, oderman S, UT opel, et al. Visualization and Analysis of Full-Waveform Airborne Laser Scanner Data [C]. ISPRS workshop ’Laser scanning 2005’, Enschede, The Netherlands, Sept 12-14, 2005: 103–108.

[9] Wagner W, Ullrich A, Ducic V, et al. Gaussian decomposition and calibration of a novel small-footprint full-waveform digitizing airborne laser scanner [J]. ISPRS Journal of Photogrammetry and Remote Sensing(S0924-2716), 2006, 66: 100–112.

[10] Adrien Chauve, Mallet C, Bretar F, et al. Processing full-waveform LIDAR data: modeling raw signals[C]// International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences(S1682-1750), 2007, 2004(3): 12–17.

赵欣, 张毅, 王相京, 涂碧海, 赵平建, 张黎明. 基于植被表面的激光测高仪回波波形模型化分析[J]. 光电工程, 2011, 38(6): 18. ZHAO Xin, ZHANG Yi, WANG Xiang-jing, TU Bi-hai, ZHAO Ping-jian, ZHANG Li-ming. Modeling Raw Signals of Laser Altimeter Echo[J]. Opto-Electronic Engineering, 2011, 38(6): 18.

基于植被表面的激光测高仪回波波形模型化分析

关于本站 Cookie 的使用提示

全站搜索

基于植被表面的激光测高仪回波波形模型化分析

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索