K波段微波高光谱辐射计的晴空定标方法

Tipping calibration method for K-band hyperspectral microwave radiometer

K波段微波高光谱辐射计应用于大气探测方向,能够减少地表至对流层内的大气廓线误差和提高廓线的垂直分辨率.针对平均辐射温度在宽大气频谱和不同天空仰角下存在浮动的问题,结合所统计的北京地区往年廓线数据和晴空条件下的Liebe大气吸收模型(1993),提出了一种微波高光谱下改进的晴空定标方法.相比于传统的晴空定标方法,该方法利用先验的气象数据对定标过程进行优化计算,有利于提高平均辐射温度的预测精度.误差分析结果表明当K波段微波高光谱辐射计采用改进的晴空定标方法时,能够有效减少平均辐射温度对其定标误差的影响.

The K band ground based hyperspectral microwave radiometer can be applied in the atmos-pheric sounding field, and it can improve the profile error and the vertical resolution of the moisture profilingfrom Earth＇ s surface to the atmospheric troposphere- For the purpose of reducing the fluctuations of the atmos-pheric mean radiant temperature in different frequencies and different elevation angles, an improved tippingcalibration method was proposed under hyperspectral microwave condition based on atmospheric profiles of Bei-jing in previous years and Liebe millimeter propagation model （MPM） （1993）- Compared with the traditionaltipping calibration, the proposed tipping calibration method can improve the prediction accuracy of the atmos-pheric mean radiant temperature based on the priori meteorological data in the current area- Analysis resultsshow that the impact of the atmospheric mean radiant temperature on calibration errors can be effectively re-duced with the improved tipping calibration method for the K-band ground-based hyperspectral microwave radi-ometer-