摘要
提出了一种地基双通道微波辐射计反演大气折射率的改进线性回归算法,该算法将折射率干项和湿项的函数表达式作为地面气象参数的输入量,更好地反映了大气折射率与地面大气参数间的相关性,物理概念清晰.通过对伊春、哈尔滨、锦州、太原、青岛、广州、三亚地区不同月份的历史探空数据进行仿真计算,证明了所提算法的有效性,结果表明:利用改进线性回归算法反演大气折射率廓线的精度普遍在5km以下,较原线性回归模型有所改善,尤其对近地面的大气折射率反演精度改善明显.
An improved linear regression arithmetic of ground-based dual-frequency microwave radiometers to retrieve the atmosphere refractivity is put forward.It sets the dry item and wet item of the refractivity as the input of surface weather parameter.So it can reflect the relativity between the atmosphere refractivity and surface weather parameter better.Physical concept of the format is also clear.The simulation of historical data of Yichun,Harbin,Jinzhou,Taiyuan,Qingdao,Guangzhou and Sanya area has proved the validity of the arithmetic.The results show that the retrieving precision of the improved linear regression arithmetic is generally increased below 5 km especially for the atmosphere near ground.
出处
《电波科学学报》
EI
CSCD
北大核心
2013年第2期316-320,共5页
Chinese Journal of Radio Science
关键词
微波辐射计
折射率
反演
线性回归
microwave radiometer
refractivity
inversion
linear regression
