本文選題：海洋通信 + 時域有限差分方法�。� 參考：《天津大學》2014年碩士論文

【摘要】：海洋無線通信信道特性十分復雜。海浪的隨機性是影響海面無線信道特性的主要因素,其對信號的影響主要體現(xiàn)在能量衰減、多普勒頻移等方面。構建穩(wěn)定的海洋通信系統(tǒng)需要很好地了解海面信道特性。本文采用FDTD算法對海洋無線通信環(huán)境下的信號傳播特性進行了研究和分析。首先,文章針對二維海面環(huán)境進行了建模分析,建模過程中采用修正的PM譜模型建立隨風速變化的隨機海面,研究無線信號在不同浪高環(huán)境下的傳播特性。三維海面模型更能真實地反映信號在海面環(huán)境中的傳播過程。進而,文章采用三維并行FDTD算法進行海面信道建模,基于MPI和OpenMP的三維并行算法有效地提高了FDTD仿真的精確性和仿真范圍。通過對上述仿真方法得到的瞬時電磁分量數(shù)據(jù)分析,得到了在固定發(fā)射機和接收機位置的情況下,以頻率和海浪高度作為參數(shù)的路徑損耗和時延擴展等模型。本文的創(chuàng)新點在于將FDTD算法應用于海面無線信道傳播特性的研究中,通過引進CPML邊界條件,改善了邊界吸收效率,提高了仿真數(shù)據(jù)的精確性。此外,本文還實現(xiàn)了基于MPI和OpenMP的三維并行FDTD算法,并應用于海面無線信號傳播特性研究。三維并行FDTD算法的實現(xiàn),不僅提高了數(shù)據(jù)仿真的精確性,而且使得該算法能有效地應用于較大區(qū)域的電磁仿真環(huán)境中。
[Abstract]:The characteristics of marine wireless communication channel are very complex. The randomness of ocean waves is the main factor that affects the wireless channel characteristics of sea surface, and its influence on the signal is mainly reflected in energy attenuation, Doppler frequency shift and so on. In order to build a stable ocean communication system, we need to understand the characteristics of the sea surface channel. In this paper, FDTD algorithm is used to study and analyze the characteristics of signal propagation in marine wireless communication environment. Firstly, the modeling of two-dimensional sea surface environment is carried out. In the process of modeling, the modified PM spectral model is used to establish the random sea surface with the change of wind speed, and the propagation characteristics of wireless signal in different wave height environment are studied. The three-dimensional sea surface model can more truly reflect the signal propagation process in the sea surface environment. Furthermore, 3D parallel FDTD algorithm is used to model the sea surface channel. The 3D parallel algorithm based on MPI and OpenMP can effectively improve the accuracy and simulation range of FDTD simulation. Based on the analysis of the instantaneous electromagnetic component data obtained by the above simulation methods, the path loss and delay spread models with frequency and wave height as parameters are obtained in the case of fixed transmitter and receiver position. The innovation of this paper lies in the application of FDTD algorithm to the study of the propagation characteristics of wireless channel on the sea surface. By introducing CPML boundary conditions, the boundary absorption efficiency is improved and the accuracy of simulation data is improved. In addition, the 3D parallel FDTD algorithm based on MPI and OpenMP is implemented in this paper, and it is applied to study the propagation characteristics of wireless signals on the sea surface. The implementation of 3D parallel FDTD algorithm not only improves the accuracy of data simulation, but also enables the algorithm to be effectively applied to the electromagnetic simulation environment in a large area.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN92

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本文編號：2088736