Research on retrieving the profile of slant paths refractivity by Ground-Based Microwave Radiometer

Based on the measurement data by MP 3000A (Ground-Based Microwave Radiometer) from January 2014 to February 2014 in the QingDao(36.04 degrees N, 103.8 degrees N), China, the azimuth change of bright temperature has been examined. The refractivety profiles are obtained by using the neural network inversion technique. The precision of the inversion technique is much batter. At a fixed elevation it is shown an asymmetry in the variation of bright temperature, so that based on the asymmetry in the variation of bright temperature the inversion refractivity profile existing in the contour line. The value is varied in contour line of refractivity at a fixed elevation with the different azimuth angles. It is shown the asymmetry characteristic of troposphere atmosphere in this experiment.