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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Equivalence Analysis of Accuracy of Geolocation Models for Spaceborne InSAR
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Equivalence Analysis of Accuracy of Geolocation Models for Spaceborne InSAR

机译：星载InSAR地理位置模型精度的等价性分析。

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摘要

There are two main geolocation models for spaceborne synthetic aperture radar (SAR) interferometry (InSAR): range Doppler (RD) and direct geocoding (DG) models. The RD model gets the target position by combining and solving the Doppler equation, slant-range equation, and the modified Earth model equation. The DG location model gets the target position through its 3-D coordinates by the Doppler equation and two slant-range equations. Usually, the geolocation accuracy analyses of these two models are discussed separately. It is confused which one is more precise and we should use during InSAR system designing. This paper deduced and compared the geolocation accuracies of these two models in the same frame-matrix. According to the matrix theory, the explicit expressions of the geolocation uncertainty of RD and DG models were deduced through the use of parameters in matrix form. After defining a new slant-range plane coordinate system, the precision of RD geolocation model and that of geocoding location model were compared quantificationally. It was presented that the geolocation uncertainty formulas between RD and DG models were the same. Then, the conclusion that these two models would lead to the same precision in geolocation measurement was obtained. At last, computer simulation results were employed to confirm the mathematical analysis.
机译：星载合成孔径雷达（SAR）干涉测量（InSAR）有两种主要的地理位置模型：距离多普勒（RD）模型和直接地理编码（DG）模型。 RD模型通过组合和求解多普勒方程，斜距方程和修正的地球模型方程来获得目标位置。 DG位置模型通过多普勒方程和两个斜距方程通过其3-D坐标获取目标位置。通常，将分别讨论这两个模型的地理位置精度分析。在InSAR系统设计中应该使用哪一种更为精确，这令人感到困惑。本文推导并比较了这两个模型在同一框架矩阵中的地理位置精度。根据矩阵理论，通过使用矩阵形式的参数推导了RD和DG模型的地理位置不确定性的明确表达式。在定义了新的斜距平面坐标系后，定量比较了RD地理位置模型和地理编码位置模型的精度。结果表明，RD模型和DG模型之间的地理位置不确定性公式相同。然后，得出了这两个模型将导致相同的地理位置测量精度的结论。最后，利用计算机仿真结果对数学分析进行了验证。

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