变温条件下多相态降雨粒子的宽频带电磁特性高效仿真研究

项目名称： 变温条件下多相态降雨粒子的宽频带电磁特性高效仿真研究

项目编号： No.61301025

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 陈嘉琪

作者单位： 河海大学

项目金额： 25万元

中文摘要： 降雨雷达通过发射电磁波远距离测量降水过程，具有大范围、实时、准确的特点，是降水测量中最具吸引力的研究方向，而降雨粒子电磁特性的研究对降雨雷达的设计具有重要价值。现有降雨微观模型尚不够完善，对温度、降雨类型等因素的影响考虑不足。本项目拟对降水粒子在变温条件下的多波段、宽频带电磁特性进行理论分析和仿真研究。分别建立固态、液态及固液混合态等多相态下的三维复杂降水粒子群精确模型；采用稀疏矩阵/规则网格方法降低模型计算复杂度和内存需求，实现对降雨粒子群的高效电磁仿真；研究二维自适应插值策略，分析在变温条件下降雨粒子宽频带电磁特性；研究比较不同降雨类型的电磁特性。课题研究将为提高降雨雷达观测精度和降雨类型的电磁特性分辨提供理论依据和分析方法。

中文关键词： 散射传播；降雨；降雨类型；；

英文摘要： Advanced radar technology has long been sought in the development of an observing system for large-scale, real-time, accurate measurements of precipitation. The study of the electromagnetic properties of rainfall particles has an important value for precipitation radar design. As the impact of changes of temperature, rainfall patterns and other factors is not consideration, the existing precipitation microscopic model is still not perfect. There will be theoretical research and simulation analysis of multiband/wideband electromagnetic scattering properties of precipitation particles under variable temperature conditions in this project. Establish accurate models of the three-dimensional complex precipitation particles in solid, liquid and solid-liquid mixed state, respectively; use sparse-matrix/canonical grid (SM/CG) method to efficiently calculate the scattering characteristics of precipitation particles(reduce the complexity and memory requirements of the model); study two-dimensional adaptive interpolation strategy, analysis wideband scattering characteristics of rainfall particles under variable temperature conditions;study and analyze the influence of rainfall types for rainfall particle electromagnetic characteristics. This project will further give help to provide theoretical basis and analysis methods

英文关键词： electromagnetic scattering；precipitation；rainfall types；；