雷达后向散射的英文

• radar backscatter

• 雷达    radar
• 后    behind; back; rear
• 向    direction
• 散射    scattering; radio scattering ...
• 后向散射雷达    backscatter radar
• 电离层后向散射雷达    ionospheric backscatter radar
• 后向散射    back scattering; backscattering; backward scattering
• 后向散射图    backscatter pattern
• 大气后向散射    atmospheric backscatter
• 后向散射系数    backscattering coefficient
• 近场后向散射    near field backscatter; near-field backscatter
• 天波后向散射    sky wave backscatter; sky-wave backscatter
• 雨滴后向散射    rain backscatter
• 反向散射的,后向散射的    backward scattered
• 反向散射电子,后向散射电子    backward scattered electron
• 大气后向散射系数    atmospheric backscatter coefficient
• 后向散射的辐射    backscattered radiation
• 后向散射紫外线    backscatter ultra-violet
• 激光后向散射装置    laser backscatter device
• 卢瑟福后向散射法    rutherford backscattering method
• 紫外后向散射计    backscatter ultraviolet radiometer
• 光子后向散射传感器    photon-backscatter sensor
• 后向散射的紫外辐射    backscattered ultraviolet radiation (buv radiation); backscattered ultraviolet radiation （buv radiation）; buv radiation
• 后向散射电离层探测    backscatter ionospheric sounding
• 后向散射紫外线辐射仪    backscatter ultraviolet radiometer

• Based on the fog drop size distribution model of radiation and advection fog , the backscattering characteristics of fog have been investigated and the empirical relations of the radar reflectivity factor and water content or visibility are obtained
  对雾的雷达后向散射特性进行了分析和研究，得到了平流雾和辐射雾的雷达反射因子与含水量和能见度的经验关系。
• We , then , parameterized a semi - empirical model for the different land surface cover types . this semi - empirical model was applied to minimize the effects of the vegetation volume scattering and extinction in radar measurements
  此外，目前星载合成孔径雷达如ers - 1 2 、 radarsat等均为单一频率、单一极化的雷达，无法从得到的单参数雷达后向散射系数中直接提取地表土壤水分信息。
• This technique is mainly involved two steps : 1 ) vegetation effects correction : we used ndvi ( normalized difference vegetation index ) derived from tm and avhrr measurements for spatial and temporal variations of vegetation covers at different scales
  但由于电磁波与地表相互作用的复杂性，雷达后向散射系数除受地表介电常数(土壤水分)影响外，还受到地表粗糙度、土壤类型、植被覆盖以及雷达入射角、频率、极化等多种因素的影响。
• Using a simple radiative transfer model for vegetation volume scattering and the integral equation model ( ibm ) for surface scattering with the field in situ measurements as the input , we compared the simulated and sar measured backscattering coefficients in different agricultural fields
  特别是在植被覆盖地表，对其下土壤水分的监测更带有极大的困难性。因此，利用雷达后向散射系数反演土壤水分必须首先充分理解微波与地表的相互作用过程。
• For parameter a , there is a close relationship exist between a ( 9 , sr ) in two different radar incident angle that can be expressed as : with considering the effects of soil texture , we get the final expression of the inversion model : where mv ( t1 ) , mv ( t2 ) is volumetric soil moisture content in two different temp , c , d is soil type related parameters , and v ( t1 ) , s ( t2 ) is coresponding bare soil radar backscattering coefficients . inversion results show that for the c band hh polarized radarsat scansar data with a range of incidence angle from 20 to 40 , the soil moisture change value can be derived with an acceptable accuracy using the above model . the temporal and spatial soil moisture change patterns are associated with rainfall and vegetation cover , as well as the soil hydraulic characteristics
  利用最新发展的电磁波散射模型研究了不同植被覆盖地表雷达波对地表土壤水分的敏感性，建立了半经验植被雷达后向散射模型; 2 ) .研究发现在农作物等矮小植被覆盖地表，植被层直接后向散射与植被类型相关，且在植被生长期，雷达后向散射系数对植被含水量的敏感性要高于对植被高度变化的敏感性; 3 ) .解决了单参数雷达地表土壤水分反演问题中，雷达入射角和地表粗糙度的影响这一难点问题; 4 ) .利用土壤介电模型校正了不同土壤类型对反演地表土壤体积含水量的影响; 5 ) .在以上成果基础上，建立了完整的单参数雷达地表土壤水分变化探测反演算法，经地表验证，模型反演地表土壤水分变化值的精度为rmse = 0
• 2 ) radar incidence angle and surface roughness correction : to make radar incidence correction and eliminate the surface roughness effects , a wide range of surface parameters ( soil moisture , surface rms height , correlation length , incidence angle ) was input to the ibm model to simulate the effect of surface roughness and radar incidence angle on the sensitivity of soil moisture to the radar backscattering coefficient . a simple model was established to simulate the effects of incidence angle and surface roughness . 3 ) establishment of soil moisture change inversion model : according to a modified ibm model simulation results , the bare surface backscattering coefficients can be expressed as a funtion of the dielectric component for a given surface roughness when the surface slope greater than 2 . 0 , which is valid for most nature surface : in above equation , r0 is the surface reflectivity at normal incidence
  本研究中，首先利用基于微波辐射传输方程的微波植被模型和积分方程( iem )模型模拟了各种地表土壤水分含量情况下，植被覆盖、地表粗糙度(包括地表均方根高度和相关长度) 、雷达入射角对c波段(频率4 . 7ghz )水平极化( hh )雷达后向散射系数的影响，在此基础上，建立模型消除了植被覆盖、地表粗糙度、及雷达入射角对雷达后向散射的影响，利用多时相50m分辨率radarsatscansar雷达后向散射系数图像反演得到了地表土壤水分变化模式信息。
• From the model study of the fractal random rough surface , we acquire one dimensional ? two dimensional fractal random rough surface model with fractal theory ; 2 . the calculation of the scattering field of light ; the establishment of the scattering light ’ intensity model , and the number calculation of the intensity distribute ; 3 . the study on the laser radar cross section of one - dimensional fractal rough surface target ; and the number calculation of the scattering intensity of two - dimensional fractal the rough surface target ; 4 . through shadowing effect , we analysis light scattering characteristic of fractal rough surface
  本论文利用分形理论得到一维?二维分形随机粗糙表面模型,研究光在一维?二维分形粗糙表面的光散射特性,主要从以下四个方面分析: 1 .自仿射分形随机粗糙表面模型探讨,采用分形理论得到一维?二维分形随机粗糙表面模型; 2 .分形粗糙表面散射光场的计算和粗糙表面散射光强角分布的模型建立和数值计算; 3 .一维分形粗糙表面目标的激光雷达后向散射截面lrcs研究和二维分形粗糙表面目标散射强度数值计算; 4 .引入遮蔽效应分析分形粗糙表面光散射特性。