Research On Remote The Method Of Sensing Of Cloud-Free Atmospheric Profiles By Microwave Radiometer

The atmospheric temperature profile represents the important parameter of atmospheric environment. Probing the profile of atmospheric temperature is very important meaning in weather forecast, atmospheric science, radiowave propagation, etc. Based on the basic theory of passive microwave sensing of the atmosphere, the retrieving of atmospheric temperature profile with microwave radiometer has been investigated. The main works are as follows:1. According to the principle of atmospheric measurement by ground-based microwave radiometer, the different frequency bands’ weighting functions of the radiation brightness temperature and its characteristics are calculated and simulated. And the method of channel selection about inversing of the atmospheric temperature profile by ground-based microwave radiometer is presented.2. Combined with the calculation and analysis about weighting functions of the radiation brightness temperature for upward-looking zenith observations, the physical method is studied by using the ground-based microwave radiometer to detect and inverse atmospheric temperature profile. The physical inversion of atmospheric temperature profile is achieved by using Smith physical iterative method. The feasibility and effectiveness of the algorithm is analyzed.3. The Smith physical iterative method is simulated and researched with historical sounding data of Qing Dao. The experiment is performed with observation data of Qingdao area measuring by the 14 oxygen absorption channels(51.248GHz、51.760GHz、52.280GHz、 52.80GHz、53.336GHz、53.848GHz、54.400GHz、54.940GHz、55.500GHz、56.020GHz、56.660GHz、57.288GHz、57.96GHz、58.800 GHz) of multichannel microwave radiometer. The analysis of error indicates that the inversion results and measured sounding shows a good consistency below 5000 m.4. Based on the simulation of historical sounding data, the investigation on the method of linear regression algorithm for inversing atmospheric temperature profile is examined.5. Using the inversion method of atmospheric temperature profile, the inversion of dry component of refractive index is implemented. Some validation of its feasibility and error analysis are performed.