A parametric formulation of the UTD diffraction coefficient for real-time propagation prediction modeling
A parametric formulation of the UTD diffraction coefficient for real-time propagation prediction modeling
复制标题
用于实时传播预测建模的 UTD 衍射系数的参数化公式
DOI：
10.1109/lawp.2005.852581
复制
发表时间：
2005
影响因子：
4.2
通讯作者：
T. Rappaport
中科院分区：
文献类型：
--
作者：
Huihui Wang;T. Rappaport
这封信提出了一个新的解决方案的范围内的一致性衍射理论（UTD）的介质劈的衍射场。利用文献[1]中的阻抗-表面楔形衍射的类UTD形式的高频解，研究了衍射系数与公式中四个表征因子之间的关系。采用多项式曲线拟合的方法，通过最小二乘准则得到四个因子的简化表达式。与严格的和启发式的配方的结果进行比较。测试了平行和垂直场偏振。新的参数制定同意严格的解决方案相当不错，并表现出显着的改进，在启发式方法的精度。这种方法能够更快，更准确地评估衍射场的传播预测模型，为城市和室内环境中的实时传播计算的潜在用途。
This letter presents a new solution to the diffracted field for dielectric wedges within the context of the uniform theory of diffraction (UTD). The relationship between the diffraction coefficient and the four characterization factors in its formulation is studied by using the high-frequency solution for impedance-surface wedge diffraction at normal incidence in a UTD-like form in a previous paper. A polynomial curve-fitting procedure is employed through the least square criterion to obtain simplified expressions of the four factors. The result is compared with rigorous and heuristic formulations. Both parallel and perpendicular field polarizations are tested. The new parametric formulation agrees the rigorous solution reasonably well and exhibits significant improvement in accuracy over heuristic methods. This approach enables faster and more accurate evaluation of diffracted field in propagation prediction models for urban and indoor environments for potential use in real-time propagation computations.