Refraction Angle Approximation Algorithm for Wall Compensation in TWRI
Refraction Angle Approximation Algorithm for Wall Compensation in TWRI
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DOI：
10.1109/lgrs.2016.2555291
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发表时间：
2016-07-01
影响因子：
4.8
通讯作者：
Liu, Qing Huo
中科院分区：
文献类型：
--
作者：
Liu, Jiangang;Kong, Lingjiang;Liu, Qing Huo
在穿透墙雷达成像中，电磁波的穿透会导致目标图像散焦并偏离其真实位置。为了解决这一问题，本文提出了一种近似壁面补偿算法，称为折射角近似算法，该算法假定实际的折射角近似等于目标的入射角为目标的方位角。这一假设是合理的，因为折射角对入射角不那么敏感，并且根据斯内尔定律限制在一个小范围内，并且余弦函数在小角度处有一个很小的导数。理论推导表明，如果目标距离雷达周围的墙面不太近，时延估计误差可以忽略不计。数值仿真验证了该算法的有效性。
Wall penetration of the electromagnetic wave causes target image defocused and displaced from its true position in through-wall radar imaging. To solve this problem, this letter proposes an approximate wall compensation algorithm, named the refraction angle approximation algorithm, which assumes that the actual refraction angle is approximately equal to the one whose incidence angle is the azimuth angle of the target. The assumption is reasonable since the refraction angle is less sensitive to the incidence angle and limited in a small range based on the Snell's law, and the cosine function has a small derivative at a small angle. Theoretical derivation indicates that the time delay estimation error can be ignored if the target is not so close to the wall surface around the radar. Numerical simulation verifies the efficacy of the algorithm.