Efficient path estimation through parallel media for wide-beam ice-sounding radar
Efficient path estimation through parallel media for wide-beam ice-sounding radar
复制标题
通过并行介质进行宽波束冰探雷达的有效路径估计
DOI：
10.1049/iet-rsn.2019.0406
复制
发表时间：
2020
期刊：
影响因子：
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通讯作者：
Arenas-Pingarrón Á
中科院分区：
文献类型：
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作者：
Arenas-Pingarrón Á
作者提出了一种算法，用于估计折射信号从源到目标通过由具有已知不同折射率的均匀平行层形成的介质所遵循的路径，这是用于冰无线电回声探测的常见模型。解析解是一个多项式，其次数指数地取决于层数，计算效率低。对于低入射角，可以使用小角度近似来避免多项式。在他们的技术中，他们将控制方程归一化以获得一个框架，在该框架中找到包含解的窄角度区间，最后估计插值边界。新方法改进了小角度近似的结果，适用于更宽的角度范围，计算时间略长。该方法已被应用于聚焦机载合成孔径雷达图像进行深冰探测，减少了计算时间，提高了宽波束和斜视几何条件下的探测响应，用于高沿着轨迹分辨率或倾斜内部层的探测。
The authors propose an algorithm to estimate the path followed by refracted signals from a source to a target, through a medium formed by uniform parallel layers with known different refractive indices, a common model used for ice radio‐echo sounding. The analytical solution is a polynomial with a degree that exponentially depends on the number of layers, being computationally inefficient. For low incidence angles, the small‐angle approximation can be used to avoid the polynomial. In their technique, they normalise the governing equations to obtain a framework where to find a narrow angular interval containing the solution, finally estimated interpolating the boundaries. The new approach improves the results regarding the small‐angle approximation for a wider angular range at a slightly higher computational time. This method has been applied to focus airborne synthetic aperture radar images for deep ice sounding, reducing the calculation time and improving the detected response in wide beam and squinted geometries, used for high along‐track resolution or the detection of sloping internal layers.