嫦娥二号卫星微波探测仪数据定标和处理结果

介绍了嫦娥二号(CE-2)与嫦娥一号(CE-1)搭载的微波探测仪(microwave radiometer, MRM)的不同之处, 给出其亮度温度的算法和地面定标系数, 并得到CE-2 MRM获得的全月亮度温度分布图.分析了亮温的数据规律, 并以此为基础归一化后比较了二者之间的数据差异.最后比较了不同取值的非线性系数对CE-2 MRM亮温定标结果产生的影响.结果表明: 目前CE-2 MRM数据在3GHz、19.35GHz和37GHz频率符合地基观测结果的范围, 同CE-1 MRM结果相比在月球低纬度地区(≤50°)差异在11K以内, 差异的主要原因是CE-2定标方法的改进以及定标方程中非线性项的引入, 而7.8GHz通道的数据异常表明该通道存在系统误差. 

Data Processing and Result Analysis of CE-2 MRM

The design difference between Chang' E -1 microwave radiometer (CE-1 MRM) and Chang' E-2 microwave radiometer (CE-2 MRM) is presented in this paper, as well as the data processing algorithm and ground calibration coefficients of CE-2 MRM. Based on the data processing results, the distribution of brightness temperature (T_B) of lunar surface is mapped. We propose a normalization model of T_B by analyzing the regularity of the T_B distribution and compare the result T_B obtained by CE-2 MRM with CE-1 MRM. The discrepancy of T_B for CE-2 MRM results from different nonlinear coefficients is presented at last. It is concluded that the CE-2 3GHz, 19.35GHz and 37GHz data coincide with earth-based observation, and the discrepancy between CE-1 and CE-2 MRM is smaller than 11K. There may be a systematic error on 7.8GHz channel.