Studies on Faraday Rotation Correction for Fully Polarimetric Microwave Radiometer at 10.7GHz

The polarization of the electromagnetic wave at lO. 7GHz used by fully polarimetric microwave radiometer for sea wind vector retrieval will rotated due to Faraday rotation when it travels through the ionosphere. Based on the Faraday rotation correction methods employed for the current radiometer, the feasibility to correct the 10.7GHz polarized channel is analyzed. The method of integrating Faraday rotation angle along observation path based on IRI（ International Reference Iono- sphere） and IGRF（ International Geomagnetic Reference Field）is studied. The geometric relationship between observation path vector and geomagnetic vector is described and detailed calculation process is presented. Finally, according to the calculation resuhs, the variation of Faraday rotation angle is analyzed, which would provide references for the selection of ascending and descending point.