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针对仝极化微波辐射计精确探测的需求,研究了辐射计姿态对于观测亮温的影响以及亮温误差校正.建立了姿态偏移与观测入射角以及极化旋转角的关系,模拟了观测亮温随观测入射角以及极化旋转角波动的变化;仿真了姿态偏移情况下的辐射计原始观测亮温;运用一种基于辐射传输模型的姿态补偿方法,以垂直极化亮温和第三Stokes参数亮温为例,对原始观测亮温展开误差校正.研究显示,该方法能够有效去除辐射计姿态偏移对观测亮温造成的影响,校正结果满足辐射计数据预处理的误差精度要求.
For the requirement of accurate detection of co-polarized microwave radiometer, the effect of the radiometer’s attitude on the observed bright temperature and the correction of the bright temperature error were studied.The relationship between attitude deviation and observed incident angle and polarization rotation angle was established, Temperature with the observation of the incident angle and the polarization rotation angle fluctuations; simulation of the original state of the radiometer under the condition of the original observed bright temperature; using a radiation transfer model-based attitude compensation method, vertical polarization and temperature of the third Stokes The parameter brightness temperature is taken as an example to correct the original observation brightness temperature.The research shows that the method can effectively remove the influence of the attitude offset of the radiometer on the observation brightness temperature and the correction result meets the error precision requirement of the radiometer data pretreatment.