搜索结果: 1-9 共查到“工学 waveforms”相关记录9条 . 查询时间(0.078 秒)
ESTIMATION OF REGIONAL FOREST ABOVEGROUND BIOMASS COMBINING ICESAT-GLAS WAVEFORMS AND HJ-1A/HSI HYPERSPECTRAL IMAGERIES
LiDAR ICESat-GLAS Waveform HJ-1A/HSI Hyperspectral imagery Forest aboveground biomass Support vector machines
2016/11/24
Estimation of forest aboveground biomass (AGB) is a critical challenge for understanding the global carbon cycle because it dominates the dynamics of the terrestrial carbon cycle. Light Detection and ...
MODELING LIDAR WAVEFORMS USING A RADIATIVE TRANSFER MODEL
Lidar Radiative transfer modeling Canopy structure
2015/3/10
In the past, obtaining reliable measurements of key forest canopy metrics has been difficult, even after the development of remote sensing technology.Fortunately, next-generation lidar systems are pro...
EVALUATION OF GEOSCIENCE LASER ALTIMETER SYSTEM (GLAS) WAVEFORMS FOR VEGETATED LANDSCAPES USING AIRBORNE LASER ALTIMETER SCANNING DATA
LIDAR laser altimetry laser waveform analysis waveform simulations topography vegetation
2015/3/10
The Geoscience Laser Altimeter System aboard NASA’s Ice, Cloud and land Elevation Satellite will record the height distribution of laser energy reflected from surfaces within 70 m diameter footprints....
LASER PULSE CORRELATION: A METHOD FOR DETECTING SUBTLE TOPOGRAPHIC CHANGE USING LIDAR RETURN WAVEFORMS
LIDAR laser altimetry waveforms natural hazards surface deformation
2015/3/10
We present a technique for using the recorded laser return pulse as a raw observation to detect centimeter-level vertical topographic change from large footprint airborne and spaceborne laser altimetr...
2D阀控电液激振器低频段振动波形分析（Low Frequency Excited Waveforms Analysis of an Electro-hydraulic Vibration Exciter Using a 2D Valve）
控制阀 电液激振器 低频段 振动波形
2010/12/29
2D阀控电液激振器是利用2D阀阀芯的匀速旋转和轴向滑动改变阀口面积变化波形，以产生频率和幅值可独立调节的振动波形。在分析该激振器工作原理的基础上，建立数学模型，采用分段积分的方法，推导出激振器输出波形方程的解析解，最后，将实验得到的波形与解析波形进行对比，根据频谱特性分析波形的失真度。研究结果表明：在低频段，由于主要受到弹性负载力方向变化的影响，振动波形表现出上升与下降过程的不对称，其不对称度取决...
A Simple, Low Power, Self Referenced Technique for Complete Characterization of Optical Frequency Combs and Arbitrary Waveforms
Fiber measurements Fiber optics communications Ultrafast measurements Pulse Shaping
2015/6/8
We demonstrate a simple scheme which uses only an intensity modulator and an OSA to achieve low-power (~100nW,10aJ/pulse at 10GHz), self-referenced, amplitude and phase characterization of optical fre...
A STOCHASTIC APPROACH FOR MODELLING AIRBORNE LIDAR WAVEFORMS
LIDAR Full-Waveform Modelling MCMC Urban
2016/2/29
In contrast to conventional airborne multi-echo laser scanner systems, full-waveform (FW) lidar systems are able to record the entire
emitted and backscattered signals of each laser pulse. Instead of...
THREE-DIMENSIONAL FLAW RECONSTRUCTION FROM WAVEFORMS MEASURED ON THE SIDE OF A CYLINDER
shape reconstruction cross-sectional imaging three-dimensional flaw pulse-echo method
2008/12/25
A modified three-dimensional inverse scattering method is applied to reconstruct the shape of a three-dimensional flaw in a cylindrical specimen. In this modified method, a measurement plane is restr...
CRACK DETERMINATION USING LASER-MEASURED HORIZONTAL AND VERTICAL VELOCITY WAVEFORMS OF ULTRASOUND
ultrasonic testing NDE crack determination laser measurement time domain BIEM elastodynamics
2008/12/23
The authors have been investigating an inverse problem of determining the position and the shape of unknown cracks in a material using velocity waveform data of the ultrasound measured with a laser i...