Inversion of Atmospheric Temperature Based on THz Radiometer

Based on the airborne terahertz detector ATMI (Airborne THz Measure Instrument) developed by Wuhan University, this paper analyzes the inversion ability of ATMI for atmospheric temperature profiles in ground-based and air-based detection modes. In view of the hardware parameters of the ATMI prototype, under air-based and ground-based measurement modes, atmospheric radiation transfer models at different latitudes are established. The inversion ability of ATMI using the BP neural network algorithm for atmospheric temperature profiles at different latitudes is discussed. After the prototype leaves the factory, one-month ground-based field measurements are carried out in mid-latitude regions. The field measurement data are used to verify the inversion ability of the ATMI prototype for atmospheric temperature profiles. The field measurement results show that for the developed ATMI prototype, in the ground-based inversion, the accuracy is better than 1 K in the altitude range of 0～36 km, and within a certain altitude range, the highest accuracy can be better than 0.3 K. This proves the effectiveness and accuracy of the developed airborne terahertz detector for the inversion of atmospheric temperature profiles. Its stability and accuracy have reached the design specifications, indicating its wide application potential in terahertz science and near-space environment monitoring.