三维高斯波束跟踪传播损耗预测改进模型  

A modified propagation loss prediction model based on 3D Gaussian beams tracing

作　　者：徐大专[1] 任佳敏[1] 朱秋明[1] 唐亚平[1] 周剑[1] 

机构地区：[1]南京航空航天大学电子信息工程学院,江苏南京210016

出　　处：《电波科学学报》2012年第6期1065-1069,1151,1261,共7页Chinese Journal of Radio Science

基　　金：航空基金(20120152001);中央高校基本科研业务费专项资金资助(NS2012075;NZ2012012);大学生创新训练计划国家级项目(201210287087);南京航空航天大学电子信息工程学院研究生学位论文创新与创优基金(DZ 8201103)

摘　　要：针对传统射线跟踪法需要考虑绕射并涉及接收球处理,从而算法复杂、计算量大等缺点,提出了一种基于三维高斯波束跟踪和二维网格加速的电波传播预测模型。该模型通过Gabor分解法将任意口径场分布展开为高斯型口径分布,直接实现了波场积分的离散化处理;高斯波束场采用复射线场模拟,并借助几何光学法加以复延拓,可处理反射、绕射和折射等复杂问题。相比传统射线跟踪法,本文模型无需考虑接收球处理和绕射,具有数学推导简单以及计算量小等优点。数值仿真结果表明,新模型预测精度与传统射线跟踪法基本相当,但预测效率可提高数十倍。For ray tracing algorithms, diffraction and receiving ball treatment need to be taken into consideration, which leads to high complexity and high computational consumption. A new Gaussian beam-tracing technique combining with 2D mesh grid approach is proposed for propagation loss prediction. A rigorous Gabor frame decomposition of source field is used to present a radiated field as a superposi- tion of shifted and rotated Gaussian beams to deal with reflection, transmission and diffraction. Beam fields are conveniently expressed by complex ray formulas to deal with the field in free space as well as complex scenes. Reflection and transmission operators are evaluated along the beam axes as in optical geometry. The collective treatment of receiving points takes use of Gaussian beam formulas which provides field-coverage values at any point in a straightforward manner without reception sphere. The simulation results show that the precision of our method is almost the same as traditional ray tracing methods while the computation time is far less than others.

关 键 词：GABOR展开 三维高斯波束 二维网格 复射线 几何光学 

分 类 号：TN011.91[电子电信—物理电子学]