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parallel ray approximation
相关语句
  平行射线近似
     I analyze the errors introduced by the parallel ray approximation and conclude that it can not be ignored for elevation determination through satellite radar system.
     结果表明,对于星载雷达而言,平行射线近似误差不能忽略。
短句来源
     A parallel ray approximation has been used to discuss the mathematic model of INSAR and DINSAR in many papers,with ignoring a small term expressing the phase part relative to the distance in the line of sight(range) and thus making it much easier for deduction.
     过去众多阐述INSAR或DINSAR的论文中 ,往往采用平行射线近似处理方法 ,舍去干涉图中随距离位置不同形成的相位成分 ,从而大大简化了后续的推导工作。
短句来源
  相似匹配句对
     PARALLEL THE RAY-TRACE IN THE CODE OF LARED-H
     LARED-H程序中光路计算的并行化
短句来源
     Study on X Ray Parallel Beam Diffraction Method
     X射线衍射平行光束法的应用研究
短句来源
     On Parallel Import
     论平行进口
短句来源
     ray radiation.
     因而可能是一种潜在的辐射防护剂。
短句来源
     in connection with X-ray.
     , 和X 射线相接。
短句来源
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A parallel ray approximation has been used to discuss the mathematic model of INSAR and DINSAR in many papers,with ignoring a small term expressing the phase part relative to the distance in the line of sight(range) and thus making it much easier for deduction.Unfortunately,after analyzing the effects of the term neglected,we draw a conclusion,it is an appropriate approach to neglect the small term only for an aircraft system but a spacecraft.Furthermore,we remove a term that would exist even...

A parallel ray approximation has been used to discuss the mathematic model of INSAR and DINSAR in many papers,with ignoring a small term expressing the phase part relative to the distance in the line of sight(range) and thus making it much easier for deduction.Unfortunately,after analyzing the effects of the term neglected,we draw a conclusion,it is an appropriate approach to neglect the small term only for an aircraft system but a spacecraft.Furthermore,we remove a term that would exist even in the absence of topography on a spherical earth from the interferogram phase,i.e. to flat earth,and deduce the important equation strictly,which shows how to obtain offset vectors from 3 Radar images without the "true" values for the off nadir angle θ to each point in the image.If the parallel ray approximation is adopted,in spite of that,we can get the same mathematic formula in the way of "flat earth",but the expression may be in no physical sense,i.e. the phase part relative with the distance in the line of sight(range) and the logic of the deduction is poor.In this paper,a revision conclusion is proposed:only if the parallel components are large enough, the above viewpoint is valid.Moreover, the ratio of the flattened interferogram phase is equal to the ratio of the perpendicular components of the baseline,independently of the topography.

过去众多阐述INSAR或DINSAR的论文中 ,往往采用平行射线近似处理方法 ,舍去干涉图中随距离位置不同形成的相位成分 ,从而大大简化了后续的推导工作。但对于星载雷达而言 ,不能忽略微小项。通过平地相位去除处理 ,建立了严密的DINSAR用于形变量提取的数学模型。采用平行射线近似处理方法 ,即使通过类似的平地相位去除处理 ,尽管可以得到同样的数学表达式 ,但无法表达干涉相位准确的物理意义 ,论证也不严密。为此 ,对当前几乎已成定论的推论进行了修正 ,并进一步推出 :如果观测期间没有发生形变 ,经过平地相位去除的干涉相位的比值与基线垂直分量的比值相等 ,与地形无关

An improved elevation model of InSAR which expresses the direct relationship be-tween height and phase has been developed based on the InSAR elevation model of Currie and Baker.The errors introduced by the parallel ray approximation applied in the improved mod-el are analyzed,and the results verify that it can not be ignored for satellite radar system.The error propagation curves and the relation between elevation errors and baseline parame-ters are also given which can be used to rectify the approximation...

An improved elevation model of InSAR which expresses the direct relationship be-tween height and phase has been developed based on the InSAR elevation model of Currie and Baker.The errors introduced by the parallel ray approximation applied in the improved mod-el are analyzed,and the results verify that it can not be ignored for satellite radar system.The error propagation curves and the relation between elevation errors and baseline parame-ters are also given which can be used to rectify the approximation errors and reconstruct the high accurate digital elevation model(DEM).In addition,based on the improved model and error propagation law,an elevation error estimation formula is derived.It gives the definite effect of the baseline length and angle on the elevation accuracy.

提出了一种改进的InSAR高程模型,建立了高程和干涉相位的直接关系,并对公式推导中一般采用的平行射线近似处理方法所引入的高程误差进行了量化分析。结果表明,对于星载雷达而言,平行射线近似误差不能忽略。给出了近似误差与基线参数的确定性关系及相应的误差传播曲线,有助于误差纠正和重建高精度DEM。另外,基于改进的高程模型,推导出了高程测量误差传播公式,明确了基线长度和方向对测高精度的影响,对合理选择干涉像对具有指导意义。

 
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