The Typical Applications Of GO Method In Tropospheric Propagation

The existence of the duct environment affects the propagation path of the radio waves and forms a different EM energy coverage. This propagation mechanism causes multiple propagation path and lead complex co-channel interference problems in communication systems. Meanwhile, because of the instability of the layer, serious path fading is also caused. In military, the presence of the duct environment may cause serious effect to radar system such as radio holes and extension of detect range. Thus, study and discussion in depth on it is very significant in fields of civil communication and national defense.In this paper, the theory of geometric optics (ray-optics) is used to study the propagation of radio waves in troposphere. Ray equation describing the propagation path of radio waves in troposphere is obtained from GO derived from classic EM theory. Different algorithms treating the ray equation are been discussed and Taler approximate mode is adopted to simulate the propagation path. The simulation results are compared with GJB/Z-87-97 data and other related results. The comparison shows the mode can be used to study the propagation behavior of radio waves with low elevation at certain accuracy.Simulation results for representative evaporation duct and standard atmosphere are also been given in this paper and the differences are been discussed. With this method, some questions like the location of radio holes and the effect of different antenna heights are been briefly analyzed.