基于PE的海洋蒸发波导宽带通信信道建模方法

A Method of Modeling Wideband Channel in Sea Evaporation Duct Communication Based on PE

射线追踪法只适于窄带信道建模,将抛物方程(PE)宽带信道建模方法首先应用于海洋蒸发波导超视距信道,并考虑了电波到达角。依据射线追踪法估计的多径参数将宽带划分为多个子带,在各频点上运行PE,频域平移求解接收高度上的场并用弯折谱估计电波到达角,对传输函数进行反傅里叶变换得到信道冲激响应。整体构成了海洋蒸发波导宽带信道建模方法。数值试验验证了建模方法的可行性。为蒸发波导宽带通信的链路预算、性能分析和系统设计提供了有效的途径。

Ray tracing （RT） is only proper to model narrow bandwidth channel. In the paper, wide bandwidth channel modeling with Parabolic Equation （PE） is first applied to wideband beyond horizontal channel in sea evaporation duct, and Waves＇ angle of arrival （AOA） was considered. The wide band was split up based on the characteristics of muhi-path signal got by RT. Then PE was performed at these frequency bins. The field at receiving height was obtained with the method of shifting in frequency domain. Waves＇ AOA was then estimated with curved wave spectral estimation （CWS）. The impulse response of the channel was Inverse Discrete Fourier Transform of the transfer function. These all shape the wideband channel modeling in sea evaporation duct. Its feasibility was checked with numerical experiments. The method presents an effectual way of link budget, performance analysis and system design in sea evaporation duct wideband communication.