On-orbit radiation correction method for spaceborne microwave radiometer

Abstract

The invention discloses an on-orbit radiation correction method for a spaceborne microwave radiometer. The method comprises the following steps of (1) screening and discriminating a radiation correction test site of the spaceborne microwave radiometer; (2) determining the conducting time of a field test; (3) designing content and a scheme of field test synchronization observation of the spacebornemicrowave radiometer; (4) conducting satellite-ground synchronization observation; (5) collecting and storing observation data; and (6) performing radiation correction data processing and analysis. With the adoption of the method, the microwave emissivity of underlaying surfaces in different types in different detection channels within a wave beam footprint can be accurately computed for a large-pixel-scale spaceborne microwave radiometer subjected to a significant influence of the surface emissivity; an accurate simulation brightness temperature result can be obtained; and on-orbit high-precision radiation calibration of the spaceborne microwave radiometer can be realized.

Description

technical field [0001] The invention relates to a microwave radiation correction method, in particular to an on-orbit radiation correction method for a spaceborne microwave radiometer, and belongs to the technical field of microwave remote sensing. Background technique [0002] Because microwave remote sensing is less restricted by weather conditions, it has the advantages of all-weather and all-weather observation, and has a certain penetration ability to clouds, fog, rain, snow, and vegetation. It can observe targets with multiple channels, multiple polarizations, and multiple angles. Remote sensing applications such as atmosphere, ocean, vegetation and soil are widely used. [0003] A microwave radiometer is a passive remote sensing instrument used to measure the microwave radiation energy of objects. According to different carrying platforms, it can be divided into space-borne microwave radiometer, airborne microwave radiometer and ground-based microwave radiometer. Am...

AI Technical Summary

Problems solved by technology

However, the above-mentioned on-orbit calibration method still has some shortcomings, such as the deviation between the thermal vacuum calibration experimental data measured by each instrument component and the actual measurement data of the on-orbit operation, and the lack of systematic and reliable verification. Affects the calibration accuracy analysis of spaceborne microwave radiometers operating in orbit

Images