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External calibration method and device for satellite-borne microwave radiometer

A microwave radiometer and satellite-borne microwave technology, applied in the field of satellite applications, can solve problems such as low accuracy, inability to accurately correct brightness temperature differences, and low brightness temperature correction reliability

Active Publication Date: 2022-03-01
NAT SATELLITE OCEAN APPL SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practice, it is found that this method will couple the brightness temperature difference at the entrance pupil of the satellite brought about by the angle and frequency into a whole for comprehensive correction, resulting in that the brightness temperature difference cannot be accurately corrected, which in turn leads to the credibility of the brightness temperature correction. less precise and less accurate

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  • External calibration method and device for satellite-borne microwave radiometer
  • External calibration method and device for satellite-borne microwave radiometer
  • External calibration method and device for satellite-borne microwave radiometer

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Experimental program
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Effect test

Embodiment 1

[0053] Please see figure 1 , figure 1 A schematic flowchart of an external calibration method for a spaceborne microwave radiometer is provided for the embodiment of the present application. Among them, the external calibration method of the spaceborne microwave radiometer includes:

[0054] S101. Obtain first brightness temperature and first space-time data of a reference space-borne microwave radiometer, obtain second brightness temperature and second space-time data of a target space-borne microwave radiometer, and obtain calibration reference data.

[0055] In this embodiment, the calibration reference data includes sea surface temperature, sea surface wind speed, atmospheric water vapor volume and atmospheric liquid water volume.

[0056] In this embodiment, both the first spatio-temporal data and the second spatio-temporal data include geographic location data and time data, wherein the geographic location data includes angle data.

[0057] In this embodiment, both th...

Embodiment approach

[0067] As an optional implementation, the method also includes:

[0068] Obtain the historical observation brightness temperature of the spaceborne microwave radiometer, and obtain the observation frequency and observation environment reference data corresponding to the historical observation brightness temperature;

[0069] Disassemble the brightness temperature of historical observations to obtain the radiation brightness temperature of ground objects, the upward brightness temperature of the atmosphere, the downward brightness temperature of the atmosphere and the atmospheric transmittance;

[0070] According to the observation environment reference data, observation frequency, surface object radiation brightness temperature, atmospheric uplink brightness temperature, atmospheric downlink brightness temperature and atmospheric transmittance, normalized fitting is carried out respectively, and the correlation between surface object radiation brightness temperature, atmospheri...

Embodiment 2

[0166] Please see figure 2 , figure 2 A schematic structural diagram of an external calibration device for a spaceborne microwave radiometer provided in an embodiment of the present application. Such as figure 2 As shown, the external calibration device of the spaceborne microwave radiometer includes:

[0167] The acquiring unit 210 is configured to acquire the first brightness temperature and first space-time data of the reference spaceborne microwave radiometer, acquire the second brightness temperature and second space-time data of the target spaceborne microwave radiometer, and acquire calibration reference data;

[0168] The judging unit 220 is configured to judge whether the reference space-borne microwave radiometer and the target space-borne microwave radiometer meet the preset space-time range according to the first space-time data and the second space-time data;

[0169] The acquiring unit 210 is also used to acquire the first frequency of the reference spacebo...

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Abstract

The embodiment of the invention provides an external calibration method and device for a satellite-borne microwave radiometer, and the method comprises the steps: obtaining a first brightness temperature and first spatio-temporal data of a reference satellite-borne microwave radiometer, obtaining a second brightness temperature and second spatio-temporal data of a target satellite-borne microwave radiometer, and obtaining calibration reference data; acquiring a first frequency of the reference satellite-borne microwave radiometer and a second frequency of the target satellite-borne microwave radiometer; calculating according to the first frequency, the first spatio-temporal data, the calibration reference data, a preset normalized correction lookup table and a preset brightness temperature correction polynomial to obtain a first brightness temperature difference value; calculating according to the second frequency, the second spatio-temporal data, the calibration reference data, the normalized correction lookup table and the brightness temperature correction polynomial to obtain a second brightness temperature difference value; calculating according to the first brightness temperature, the first brightness temperature difference value and the second brightness temperature difference value to obtain the simulated brightness temperature of the target satellite-borne microwave radiometer; and fitting a calibration coefficient according to the simulated brightness temperature and the second brightness temperature.

Description

technical field [0001] This application relates to the field of satellite applications, in particular, to an external calibration method and device for a satellite-borne microwave radiometer. Background technique [0002] The current external calibration method of spaceborne microwave radiometers usually uses the double-difference method to correct the difference in brightness temperature of different spaceborne microwave radiometers, and uses this as a benchmark for brightness temperature comparison to carry out calibration. However, in practice, it is found that this method will couple the brightness temperature difference at the entrance pupil of the satellite brought about by the angle and frequency into a whole for comprehensive correction, resulting in that the brightness temperature difference cannot be accurately corrected, which in turn leads to the credibility of the brightness temperature correction. lower accuracy and lower accuracy. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/52G01J5/53
CPCG01J5/52
Inventor 周武林明森
Owner NAT SATELLITE OCEAN APPL SERVICE