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目标反射率
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  “目标反射率”译为未确定词的双语例句
     Finally, we choose the proper CCD camera by the analysis or the calculation of the characteristic of the atmosphere, the reflection rate from the object, the dexterity of CCD camera and so on.
     通过对大气特性、目标反射率、CCD器件灵敏度等的分析和计算,选定CCD相机。
短句来源
     The fundamental task of a range-Doppler radar imaging system is to reconstruct the spatial distribution of reflectivity of a target from the returned radar signals containing range and Doppler information.
     距离多普勒雷达成像系统的基本任务是利用雷达回波信号的距离和多普勒信息重构目标反射率的空间分布。
短句来源
     A dynamic optimization approach for superresolution range-doppler imaging is proposed in this paper. The basic idea of this approach is that it uses the regularized image reconstruction approach and the dynamic optimization algorithm to find out the least squares estimate of reflectivity of the radar target.
     提出了超分辨距离多普勒成像的动态优化方法,基本思想是利用正则化图像重建方法及动态优化算法求出雷达目标反射率的最小二乘估计。
短句来源
     Based on object-background contrast,the main factors influencing the detection of underwater target under the condition of visible light are analyzed. The relationship of object-background contrast with visual zenith angle,solar zenith angle,seawater optical properties and object reflectance is discussed. The optimal visual angle in detecting underwater target is given.
     目标背景对比度是探测和识别目标的判定标准之一,基于目标背景对比度,分析了可见光条件下探测水下目标的主要影响因素,探讨了水下目标背景对比度同观察者角度、太阳天顶角、海水光学性质以及目标反射率的关系,给出了获取最佳观测角度的方法。
短句来源
     This paper give the Monte Carlo method,which is used to simulate the whole physical course of the visible light propagation in the sea water and being reflected by the underwater object. It analyzed the main factors,which affect the visible-light detection confirming the relation of visible-light concealment depth respectively with the seawater optical properties,solar zenith angle,visual zenith angle,target reflectance,object size and shape etc. as well as its law of variation.
     采用蒙特卡罗方法模拟了可见光在海水中传播并被水下目标反射的整个传输过程,分析了可见光条件下水下目标光学隐蔽性的主要影响因素,给出了水下目标可见光隐蔽深度同观测角度、太阳天顶角、海水的光学特性以及目标反射率和大小的关系。
短句来源
  相似匹配句对
     Reflector board(cooperative target) reflectivity measuring instrument
     反光板(合作目标)反射率测量仪
短句来源
     The Aim of Translation
     翻译的目标
短句来源
     Target:KONGO!
     目标-金刚
短句来源
     This paper introduces the development study of Reflector board(cooperative target) reflectivity measuring instrument.
     本文介绍了反光板(合作目标反射率测量仪的研制。
短句来源
     Measurement of the Vacuum Ultraviolet Reflectivity
     真空紫外反射率的测定
短句来源
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  target reflectivity
The desired image is the scattering functionS(f, τ), which describes the second-order statistics of target reflectivity in delay-Doppler coordinates.
      


The fundamental task of a range-Doppler radar imaging system is to reconstruct the spatial distribution of reflectivity of a target from the returned radar signals containing range and Doppler information. In this paper the range-Doppler imaging of a moving target by an inverse synthetic aperture radar is investigated from the viewpoint of multiple scatter-point localization. Both motion compensation and image formation, which are the two critical steps of signal processing in imaging radars, are solved simultaneously...

The fundamental task of a range-Doppler radar imaging system is to reconstruct the spatial distribution of reflectivity of a target from the returned radar signals containing range and Doppler information. In this paper the range-Doppler imaging of a moving target by an inverse synthetic aperture radar is investigated from the viewpoint of multiple scatter-point localization. Both motion compensation and image formation, which are the two critical steps of signal processing in imaging radars, are solved simultaneously as a maximum likelihood estimation problem. In principle, a multidimensional search is required. Generally, the computational load is extremely heavy because the number and the location of scatter-points on the target and the orbital motion of the target are all unknown a priori. When some reasonable assumptions are valid, we may introduce DFT and avoid estimating the number and locations of scatter-points. Thus the searching dimensions may be greatly reduced. The computational efficiency can be further increased by utilizing FFT, The cost for so doing is a lower final imaging quality. When the orbital motion of the target is described by a quadratic range-time function, only two-dimensional search is needed. A further simplified motion compensation and imaging formation algorithm is derived. Computer simulation results are also given.

距离多普勒雷达成像系统的基本任务是利用雷达回波信号的距离和多普勒信息重构目标反射率的空间分布。本文把用逆合成孔径雷达对运动目标进行距离多普勒成像当作多散射点定位问题来研究,把成像雷达信号处理的两个关键,运动补偿和成像作为最大似然估计问题一起求解。原则上需进行多维搜索,一般情况下,目标上散射点的个数、位置以及目标的轨道运动都先验未知,这种求解的计算量极大。在若干合理的假设成立时,可引入DFT,免去估计散射点个数和位置,大大减少搜索维数,并可利用FFT,从而大大提高计算效率。这样做的代价是最终的成像质量有所下降。当目标轨道运动模型可用二次的距离时间函数描述时,只需进行二维搜索,文中导出了进一步简化的相位补偿和成像算法,并给出了计算机模拟结果。

A dynamic optimization approach for superresolution range-doppler imaging is proposed in this paper. The basic idea of this approach is that it uses the regularized image reconstruction approach and the dynamic optimization algorithm to find out the least squares estimate of reflectivity of the radar target. The computing efficiency of the dynamic optimization algorithm ss greatly improved by using the FFT. The live data of a metalized scale model B-52 aircraft mounted on a rotating platform in a microwave chamber...

A dynamic optimization approach for superresolution range-doppler imaging is proposed in this paper. The basic idea of this approach is that it uses the regularized image reconstruction approach and the dynamic optimization algorithm to find out the least squares estimate of reflectivity of the radar target. The computing efficiency of the dynamic optimization algorithm ss greatly improved by using the FFT. The live data of a metalized scale model B-52 aircraft mounted on a rotating platform in a microwave chamber and a flying Boeing-727 air-craft were processed by the use of the superresolution imaging approach. Comparisons of imaging results with FFT-RD approach are given and show that, by the use of the superresolution approach, either higher resolution images for the same effective bandwidth of transmitted signals and total rotation angle in imaging or equal quality images from small bandwidth and total rotation angle may be obtained. We have found that the dynamic optimization approach is hopeful to be able to provide even better resolution performance if more a priori information about the image region is utilized sufficiently.

提出了超分辨距离多普勒成像的动态优化方法,基本思想是利用正则化图像重建方法及动态优化算法求出雷达目标反射率的最小二乘估计。还利用FFT大大提高了动态优化算法的计算效率。用B-52飞机缩比金属模型微波暗室转台实验数据和Boeing-727飞机外场实测数据进行成像的初步结果表明,采用超分辨成像方法可以获得更高的图像分辨力;或用较小的信号带宽和成像总转角,可以获得相同质量的图像。进一步研究发现,如果能充分利用成像区域中更多的先验信息,动态优化方法可望能提供更好的分辨性能。

This paper calculates the irradiance of signal light reflecting from the object and backscatter light at the place of receiver by two flux irradiant transmiting theory and scattering theory of collimated light beam,and obtains the theoretical value of underwater laser imaging distance.In ordinary condition,the value is about 12 attenuation lengths. We analyse theoretically the quantity relationship of imaging distance against the main parameters such as visual angle of receiver,the distance between laser and...

This paper calculates the irradiance of signal light reflecting from the object and backscatter light at the place of receiver by two flux irradiant transmiting theory and scattering theory of collimated light beam,and obtains the theoretical value of underwater laser imaging distance.In ordinary condition,the value is about 12 attenuation lengths. We analyse theoretically the quantity relationship of imaging distance against the main parameters such as visual angle of receiver,the distance between laser and receiver,reflecting ratio of the object, and get the quantitative value of logarithmic relationship between the survey distance and laser light power in practical system.

利用双流辐射传输理论和准直光束的散射理论分别计算出接收端目标反射光信号和背向散射光的辐照度,从而得出水下激光成像距离的理论值.一般条件下,该值约为12倍衰减长度.从理论上分析了成像距离与接收器视场角、激光器和接收器间距、目标反射率等主要参数的定量关系.从机理上分析了主要参数影响的原因得到了在实际应用系统中探测距离与激光器光功率成对数关系的量值.

 
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