摘要
机载气象雷达的基本任务是探测航路前方气象目标的位置和强度,而表征气象目标强度的物理量是反射率因子,通常依据气象雷达方程来估计。当雷达载台位于高空、对中远距离低高度的气象目标进行观测时,由于雷达波束的不完全充塞,反射率因子的估计值会小于实际值,严重影响对目标危险等级的判别。本文将充塞系数引入气象雷达方程,提出了一种基于雷达实时工作参数的充塞系数估算方法,并详细分析了不同系统参数下充塞系数变化情况。仿真气象目标数据的处理结果表明,该方法能有效地提高反射率因子的估计精度。
The basic task of an airborne weather radar is to detect the position and intensity of meteorological targets ahead of the plane.The intensity of the meteorological targets can be represented by the physical quantity called reflectivity factor,which is often estimated from the weather radar equation.When observing the middle-or long-range meteorological targets at low altitude from a high-altitude radar platform,due to the incomplete beam filling,the measurement result of the reflectivity factor is much less than the actual value.This effect seriously lowers down the accuracy of determining the hazard level of the target.This paper firstly introduces a beam filling coefficient into the weather radar equation and then presents its estimation method based on the real-time radar operating parameters.The variation of the filling coefficient is fully analyzed under different radar system parameters.Finally,the validity of the proposed method is verified by processing the raw-data of the simulated meteorological targets.Simulation results show an effective improvement of the accuracy of the reflectivity factor.
出处
《数据采集与处理》
CSCD
北大核心
2014年第4期642-647,共6页
Journal of Data Acquisition and Processing
基金
江苏省高校优势学科建设工程资助项目
航空科学基金(20132007001)资助项目
江苏省研究生培养创新工程(SJLX_0131)资助项目
中央高校基本科研业务费专项资金资助项目
关键词
机载气象雷达
气象雷达方程
充塞系数
反射率因子
参数估计
airborne weather radar
meteorological radar equation
beam filling coefficient
radar reflectivity factor
parameter estimation
