Microphysics-Based Polarization Simulation For The Airborne Weather Radar

With the continuous development of civil aviation, the application of airborne weather radar technology greatly improves the instantaneity and accuracy of the forecast for the safe operation of the civil aviation aircraft. In accordance to technical reasons, the existing air-borne weather radar can only use the radar reflectivity to judge the moisture content of meteorological targets, which means it does not yet have the function of target classification. The airborne weather with dual-polarization technique is the next generation development trend, which can effectively improve the weather radar's function of target classification. The theory of airborne dual-polarization weather radar is in the stage of development without real data support. The meteorological target simulation with polarization information is great significant for the theoretical research and implementation of dual polarization Doppler weather radar. To research next airborne weather radar system with a polarized meteorological data simulation is a precondition of the related technology research.Firstly, with a detailed analysis of the dynamics frame and the settings of initial boundary conditions, the mesoscale weather forecast model is introduced in this chapter. From the microphysics and cumulus parameterization schemes, etc., the effects of different modes of programs on meteorological modeling scene are analyzed.Secondly, the theory of polarization meteorological targets is introduced. Based on the scattering characteristics of the different meteorological targets, the single particle and the group particle scattering properties are analyzed in this chapter. Thus, the electromagnetic scattering model of macro meteorological targets is established.Thirdly, considering the real precipitation scenario, geographic information, convection, phase change and other factors, a real meteorological scene is simulated by using mesoscale weather forecast model, which obtain temperature, particle concentration, mixing ratio and etc. And the Cloud, raindrops, ice, snow, graupel and hail are simulated by a dynamic process. The results show that the method can output high-fidelity meteorological data.Finally, an airborne weather radar target simulation based on the polarization characteristics is proposed on the basis of analysis the physical characteristics, which use the T-matrix method to calculate the scattering matrix and coherent superposition to achieve mixed meteorological polarization parameters. Simulation results and the real data con-firmed the validity and reliability of the proposed method.