Method and device for external calibration of space-borne salinity meter in cold space

Abstract

The invention provides a spaceborne salinometer cold space external calibration method and device, and relates to the satellite observation field. The method includes the steps: according to the land specific gravity in an antenna antical lobe view field of a spaceborne salinometer, determining a preselected area suitable for cold space external calibration; according to preset observation data corresponding to an antenna main lobe of the spaceborne salinometer, determining a time window suitable for cold space external calibration, wherein the observation data include space radiation, solar radiation and moon radiation; according to a cold space external calibration satellite actual running orbit corresponding to the preselected area and the time window, calculating a standard antenna temperature; and carrying out statistical processing on the standard antenna temperature and the actually measured antenna temperature of the spaceborne salinometer, to obtain a cold space external calibration coefficient for correcting the salinometer observation brightness temperature deviation. The method can perform external calibration on the salinometer regularly to obtain the instrument calibration coefficient, and is used for correcting the deviation of the observed brightness temperature obtained by the salinometer; and moreover, the method systemically solves the problem of the spaceborne salinometer cold space calibration in China.

Description

technical field [0001] The invention relates to the field of satellite observation, in particular to a cold-space external calibration method and device for a space-borne salinity meter. Background technique [0002] Seawater salinity is one of the important parameters to describe the state of the ocean. Studying its change and distribution is of great significance for analyzing the characteristics of the ocean itself and understanding the role of the ocean in the complex air-sea system. Moreover, the salinity of seawater is also a research object focused on by other disciplines and application fields such as meteorology, ecology, hydrology and fishery. [0003] In the process of studying seawater salinity, it is first necessary to obtain sea surface salinity; at present, the brightness temperature data of the target sea surface is directly obtained through satellite-mounted microwave radiometers, and then the seawater salinity is retrieved from the observed brightness tempe...

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Problems solved by technology

[0004] However, in the above method of retrieving the sea surface salinity value, the accuracy of the observed brightness temperature has a great influence on the retrieved seawater salinity, and the observed value will have a certain deviation due to the attenuation of the instrument performance of the salinity meter. In order to ensure the accurate determination of the brightness temperature observed by the salinity meter and correct the deviation of the brightness temperature observed by the instrument in time, it is necessary to periodically calibrate the salinity meter externally to obtain the instrument calibration coefficient for correcting the deviation

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