Automatic observation meteorological satellite thermal infrared channel on-orbit site radiometric calibration method

Abstract

The invention discloses an automatic observation meteorological satellite thermal infrared channel on-orbit site radiometric calibration method, which comprises the following steps that: acquiring lake surface water temperature observation data synchronously measured by a satellite and the ground by an unmanned ship water surface automatic observation system in an automatic data acquisition mode, and reading the observation data; after reading the observation latitude and longitude data of the unmanned ship, matching the observation latitude and longitude data with the observation data of a meteorological satellite; during matching, firstly, selecting matching points of a cloudless area, acquiring observation data on the matching points, and averaging pixel DN values of windows around meteorological satellite data; reading and processing sounding data, and performing matching; simulating to obtain the apparent radiance of an atmosphere top channel on each matching point; and performing linear regression calculation to obtain an absolute radiometric calibration coefficient of a to-be-calibrated channel. According to the method, the calibration frequency can be improved to a great extent by acquiring the encrypted sounding atmosphere profile data, and the calibration precision can be further improved.

Description

technical field [0001] The invention relates to the technical field of absolute radiation calibration of an infrared remote sensing sensor, in particular to a radiation calibration method for an on-orbit site of a thermal infrared channel of an automatic observation meteorological satellite. Background technique [0002] After half a century of hard work, my country has successfully launched 19 meteorological satellites, 9 of which are currently in orbit, forming a comprehensive earth observation capability that takes into account both imaging and detection, covering visible infrared microwave and other spectral bands, and has become the world's largest polar-orbiting satellite. One of the few countries that has two series of operational meteorological satellites, and geostationary. The new generation of polar-orbiting and geostationary meteorological satellites - Fengyun-3 and Fengyun-4 have realized the upgrading of my country's meteorological satellite observation system, ...

AI Technical Summary

Problems solved by technology

These have directly affected the preprocessing of satellite data and the production of standard products; the lack of authenticity testing of the measured physical parameters reduces the reliability and application of data products, and cannot meet all the requirements for providing models or algorithms for applications

In addition, the absolute calibration of the orbital site radiation requires a lot of manpower, material resources and financial resources. Therefore, it is necessary to overcome the imperfect calibration on the satellite, the large workload of the site calibration and the low frequency (one or two field tests can be carried out every year), and the field test. Synchronous observation experiments have a large workload, many observation parameters, complex data processing procedures, difficult control of precision, and high threshold for cross-calibration implementation.

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