摘要
在雷达目标跟踪优化控制中,多径效应影响地面雷达对低空目标的探测精度。由于多径效应的存在,使得回波信号功率大大减弱,甚至淹没于背景杂噪当中,造成漏警。提出了多径效应产生的原因并建立多径效应数学模型,依托FEKO软件建立室内仿真模型,仿真出信号在传播过程中经过的直射、散射和反射路径,并对产生的多径衰落进行分析。仿真结果表明,在室内模型的典型接收区域发生了较为严重的多径衰落,并且室内电场分布服从瑞利分布,与典型的快速衰落多径模型相吻合。方法从原理上实现了对多径效应的仿真,为进一步消除多径衰落影响和在真实环境下进行相关实验提供了理论参考。
The multipath effect is an important factor that affects the ground radar to detect low altitude target. Because of the multipath effect, the power of its echo signals can be reduced sharply, even disappeared in noise and clutter. Based on the mathematical model, an indoor simulation model was proposed with FEKO simulation software. The direct, scattering and reflection routes were simulated in the process of signal transmission and the muhipath fa- ding was analyzed. From the result, indoor model caused a severe mnhipath fading in typical receiving area and its e- lectric field was satisfied with Rayleigh distributing. This is in keeping with fast fading multipath model. Indoor mod- el realizes the muhipath effect simulation in this background in principle, provides theory reference and eliminated multipath fading effect in real environment.
出处
《计算机仿真》
CSCD
北大核心
2015年第8期18-21,36,共5页
Computer Simulation
关键词
多径效应
低空目标
电场分布
Muhipath effect
Low altitude target
Electric field distribution
