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完全聚焦
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  focusing effect
     Shaping mechanism of bright area on the test screen and the sharp focusing effect
     完全聚焦作用与测试屏幕上亮区的形成机理
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  “完全聚焦”译为未确定词的双语例句
     For large squint angle, the image will be defocused away from the reference range due to the secondary range compression (SRC).
     对大斜视角数据 ,由于二次距离压缩误差的影响 ,偏离参考距离的散射点未能完全聚焦 ,且离参考距离越远聚焦性能越差。
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     This paper takes a review on the development of SAR and its interferometric (InSAR) technology. The historic milestones of SAR development from unfocused to focused, from optical to digital processing, from 2-D to 3-D interferometric mapping are respectively described.
     本文回顾了SAR及干涉合成孔径雷达(InSAR)技术的历史,叙述了SAR由非聚焦到完全聚焦,由光学处理到全数字式处理,由二维测绘到干涉三维测绘的发展历程。
短句来源
     In this article, based on the relative focusing formula, we discuss the sharp focusing phenomenon and point out that it is one order.
     根据相对聚焦强度公式,分析了灯丝上发出的光线在通过旋转抛物面反射到测试屏幕上的B,C两点时所具有的完全聚焦现象,并说明了这种聚焦的现象是一阶的.
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  相似匹配句对
     Focus
     聚焦
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     Focusing on Carbon Fiber
     聚焦碳纤维
短句来源
     Shaping mechanism of bright area on the test screen and the sharp focusing effect
     完全聚焦作用与测试屏幕上亮区的形成机理
短句来源
     Analysis of atom focusing for nanostructure fabrication with a completely off-resonant optical standing wave
     用完全非共振光驻波聚焦原子制作纳米结构分析
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     PROBLEM ABOUT PERFECT NUMBER
     完全数简介
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  focusing effect
A parametric study of the particle concentration distributions in this region is performed and the range of governing parameters on which the particle focusing effect is maximal is found.
      
Focusing Effect in Heat Transfer of a Multicomponent Liquid with Internal Heat Sources
      
Focusing effect of coadsorbed CO on the spatial distribution of H2 flow desorbed from iridium
      
Role of the electron forward-focusing effect in the formation of Kikuchi patterns of single-crystal silicon
      
It has thus been demonstrated that the forward-focusing effect at an energy E=2 keV plays a dominant role in the formation of Kikuchi patterns, which permits their use for visualization of the atomic structure of a surface.
      
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A quick look imaging formation method (QLFM) and its realization for the existing airborne stripmap SAR system are put forward in this paper. After the De Chirp operation on echo returns along both the azimuth and slant range direction, a two dimensional inverse Fourier transform is carried out to form the output imaging directly. Computer simulation and raw data imaging results are used to verify the feasibility of this quick look method in airborne SAR systems.

提出了一种适于机载SAR成像处理的快视方法(QLFM)及其实现。该方法的高效、实用性主要表现在以下几个方面:①成像处理流程中的运算单元较少,即二维去调频之后,一次二维的逆付立叶变换即可以完成快视功能;②该算法的全息特性使得成像积累不必满足一个合成孔径时间的要求,采用少量有限的回波数据即可获得较大测绘区域内的图像;③QLFM可对被测区域中心进行灵活地选择,且测绘中心处可获得高分辨率完全聚焦的图象;④该算法实现的主要功能模块为复乘和FFT,可通过灵活地旁路控制完成其在传统条带SAR处理机中的嵌入。计算机仿真及原始数据成像结果验证了QLFM算法的快视功能。

In this paper, a new class of focusing matrices for coherent signal subspace method (CSM) is proposed. These matrices are formed based on the concept of uniform focusing transformation of the directionofarrival (DOA) of wideband sources. In each frequency bin, it is assumed that there exists a common focusing matrix on all DOA's of some range. Then the best approximate one is just the focusing matrix about the unknown DOA's in the range. These focusing matrices are a kind of perfect focusing matrices and can...

In this paper, a new class of focusing matrices for coherent signal subspace method (CSM) is proposed. These matrices are formed based on the concept of uniform focusing transformation of the directionofarrival (DOA) of wideband sources. In each frequency bin, it is assumed that there exists a common focusing matrix on all DOA's of some range. Then the best approximate one is just the focusing matrix about the unknown DOA's in the range. These focusing matrices are a kind of perfect focusing matrices and can be applied to a known arbitrary geometry array.

相干信号子空间处理方法(CSM)是一种通过构造聚焦(focusing)矩阵来估计宽带相干源波达方向(DOA)的有效方法。本文基于一致聚焦的概念,给出了一种可用于任意阵列的完全聚焦方法,从而极大地改善了DOA的估计分辨率、估计精度等性能,大大降低了估计方法的信噪比阈值。文中在最后通过计算机仿真,与CSM方法进行了比较,验证了本方法的优良性能。

This paper presents an extended chirp scaling algorithm, named frequency scaling algorithm. This algorithm allows the processing of dechirped raw data. By means of a new frequency scaling operation, the range migration is corrected without interpolation, and the residual video phase term is removed at the same time. For large squint angle, the image will be defocused away from the reference range due to the secondary range compression (SRC). In the paper we use different reference ranges to do the SRC, and then...

This paper presents an extended chirp scaling algorithm, named frequency scaling algorithm. This algorithm allows the processing of dechirped raw data. By means of a new frequency scaling operation, the range migration is corrected without interpolation, and the residual video phase term is removed at the same time. For large squint angle, the image will be defocused away from the reference range due to the secondary range compression (SRC). In the paper we use different reference ranges to do the SRC, and then filter out the well-focused signal to combine the whole range images. By this approach, the SRC error can be reduced effectively. Simulation result shows that good images can also be achieved when the squint angle is up to 60 degree.

给出了一种改进线频调变标算法 ,该算法适用于处理距离解线调后的聚束式SAR数据。应用频率变标技术 ,给出的算法在消除信号剩余视频相位项的同时进行距离单元徙动校正 (RCMC) ,避免了插值运算。对大斜视角数据 ,由于二次距离压缩误差的影响 ,偏离参考距离的散射点未能完全聚焦 ,且离参考距离越远聚焦性能越差。在一定的聚焦深度下 ,用不同的参考距离对数据进行二次距离压缩 ,并用相应的滤波器滤出聚焦部分图像 ,然后拼接成完整的距离像 ,从而有效地降低了距离压缩误差。仿真结果表明 ,对给定的SAR参数 ,在斜视角为 6 0°时 ,能得到较好的成像结果

 
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