Back Scattering The Ionograms Simulation Platform Research

The ionosphere is a complex medium,which is aeolotropy,asymmetry,dispersive and changes randomly with time.In order to improve the communication quality of the shortwave that depends on the ionosphere,we should have aknowledge of the current condition of the ionosphere in real time.The backscatter sounding of high frequency can diagnose the real-time channel characters for shortwave communication or HF radar,which is great assistant to shortwave communication and HF radar.The emphasis of this paper is to simulate the backscatter ionograms using ray tracing technology. First,the ray tracing equation and its numeric solution is presented in this paper,then on the base of quasi-parabolic ionosphere model,using the technology of the numeric ray tracing,a ray tracing simulateing platform is established.This platform can simulate the ray tracing for a fixed frequency or sweeping frequencies,also can calculate the group path and the covered region of rays. Then according to the radar equation,on the base of the platform of ray tracing,builds a simulation platform of backscatter ionogram.Based on the QPS ionosphere model,the gradients model,quasi-cosine disturbed model and QPS model with ES layer are also introduced.Then using the platform, the backscatter ionogram of these typical states are simulated,comparing with the real ionogram to find that they can match well,which proves the validity and practicability of the platform.The influence of the inputting parameters of these model and antenna patterns on the backscatter ionogram is also discussed in this paper.