Analysis Of Radio Propagation Using Parabolic Wave Equation

system is widely used, such as radar,GPS,mobile communication system and so on. Radio wave propagation exists in all modern wireless systems. So the research of predicting characteristics of radio propagation in complex environments has become an important research subject.The parabolic equation (PE) method is used widely in radio propagation, because of its ability of managing complicated environments accurately. So this dissertation mainly focuses on the PE algorithms applied to the computation of electromagnetic propagation problems. Firstly, the parabolic equation algorithms are deduced rigorously. The several approximations of PE are analyzed. It introduces two numerical solutions to solve parabolic equation and analyze the methods of solving initial fields. The impedance boundary condition is processed by mixed Fourier transform and the concrete steps are given. Secondly, the characteristics of radio propagation over rough water surface is predicted using the PE method. It constructs the PE model and uses a spectral estimation to determine the graving angle. A propagation experiment is performed at a lake to verify the accuracy of the PE model. At the experiment, the results of 9.4GHz signal attenuation are measured at 355m and 610.5m. The errors between numerical values and measured result are 0.157 dB and 0.92 dB, which can say that the PE model is able to predict characteristics of radio propagation in rough water environments. At last, the analysis of radio propagation in irregular terrain environment is presented. The method, referred to as TPEM, is introduced to flatten the boundary and a propagation experiment is performed to verify its accuracy. At the experiment, the results of signal attenuation of 5.5GHz and 6GHz are measured at two kinds of irregular terrains. The errors between numerical values and measured result are less 2.2 dB, which can say that the PE model meets the project needs.