Calibration method used for fully polarimetric microwave radiometer

Abstract

The invention discloses a calibration method used for a fully polarimetric microwave radiometer, which accomplishes calibration of the fully polarimetric microwave radiometer through steps as follows: setting initial values of a calibrating device of the fully polarimetric microwave radiometer, confirming a process matrix, confirming a matrix, confirming the condition number of the matrix, and confirming the minimum Kmin(S). The method gives a judgment basis for selecting vectors from a plenty of vectors which can be used in calibrating the fully polarimetric microwave radiometer so as to acquire higher calibrating accuracy. after the minimum condition number optimization is adopted, the obtained fully polarimetric microwave radiometer calibrating matrix has a smaller condition number, the matrix inversion result is enabled to be more stable, the error bound is smaller, and the calibrating accuracy of the fully polarimetric microwave radiometer can be improved. The method disclosed by the invention is characterized in that the error perturbation matrix is applied onto the calibrating inversion matrix of the fully polarimetric microwave radiometer, the calibration source temperature is taken as an optimized parameter, and the minimum condition number is taken as the basis for judging the ill-condition of the calibrating inversion matrix of the fully polarimetric microwave radiometer.

Description

technical field [0001] The invention relates to a calibration method for a fully polarized radiometer, in particular to a calibration method for a fully polarized microwave radiometer. Background technique [0002] The complex correlation information output by the fully polarimetric radiometer is very sensitive to anisotropic brightness temperature radiation, which has been verified by the US Jet Propulsion Laboratory, the Georgia Institute of Technology, and the Technical University of Denmark in the 1990s. The main way of wind field remote sensing. To ensure the accuracy of remote sensing data, fully polarimetric radiometers must be calibrated before use. J. Lahtinen of Helsinki University of Technology (HUT) in Finland publicly reported their fully polarimetric radiometer calibration method in 2003, and the results were published in IEEE related journals and J. Lahtinen's doctoral thesis "Fully polarimetric radiometer system for airborne remote sensing" above. In 2008,...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a calibration method for a fully polarimetric microwave radiometer, which solves the problem that the existing method cannot select a matrix that can more effectively control the error limit of the calibration result among many matrices that can be used for the calibration of the fully polarimetric radiometer. The problem of calibrating the matrix

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