Ground vacuum calibration test method of satellite-borne passive microwave remote sensing instrument by use of three calibration sources

A passive microwave remote sensing and calibration source technology, which is applied to instruments, scientific instruments, thermometer testing/calibration, etc., to achieve the effects of improving quantitative applications, solving technical difficulties, and high calibration accuracy

Inactive Publication Date: 2012-06-27
SHANGHAI SATELLITE ENG INST
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Problems solved by technology

However, most of the published related papers are limited to the discussion of the importance of the calibration work and the algorithm research on the calibration data, and there are very few reports on how to systematically do the grou...

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  • Ground vacuum calibration test method of satellite-borne passive microwave remote sensing instrument by use of three calibration sources
  • Ground vacuum calibration test method of satellite-borne passive microwave remote sensing instrument by use of three calibration sources
  • Ground vacuum calibration test method of satellite-borne passive microwave remote sensing instrument by use of three calibration sources

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Embodiment Construction

[0026] Preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0027] The ground vacuum calibration test method of the spaceborne passive microwave remote sensing instrument is based on the Planck radiation law, and using the Rayleigh-Jeans approximate formula, it can be concluded that there is a linear relationship between the output voltage of the passive microwave remote sensing instrument and the brightness temperature of the observed scene. From this, the calibration equation can be determined as:

[0028] T B =a×C OUT +b

[0029] Among them, T B is the target scene, C OUT is the corresponding output voltage count value of the receiver, and a and b are the scaling coefficients. According to the principle of two points to determine a straight line, the radiometer separately adjusts the low-temperature (cold) calibration source T in each calibration cycle. COLD and high temperature (thermal) calibration s...

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Abstract

The invention discloses a periodical two-point calibration test method using three calibration sources. By adopting temperature control measures, the passive microwave remote sensing instrument is controlled to be set to work at different working temperatures, and the input/output response curves of the passive microwave remote sensing instrument at different ambient temperatures are obtained; by analyzing the test data, the basic performance parameter and calibration precision of the passive microwave remote sensing instrument working at different temperature conditions are obtained; and therefore, high-precision vacuum microwave calibration test is performed on the ground for the satellite-borne passive microwave remote sensing instrument, and the technical difficulty in the ground vacuum calibration test of the satellite-borne passive microwave remote sensing instrument of our country is solved. The test method has high calibration precision (higher than 1k), estimates the reality of the basic performance of the passive microwave remote sensing instrument, obtains the calibration parameters required by the quantitative application of the on-track remote sensing data of the passive microwave remote sensing instrument, and improves the beneficial effects of the passive microwave remote sensing instrument in on-track quantitative application.

Description

technical field [0001] The invention relates to a ground test of a satellite passive microwave remote sensing instrument, in particular to a ground vacuum calibration test device and test method for a spaceborne passive microwave remote sensing instrument using three calibration sources. Background technique [0002] Fengyun-3 satellite is a new generation of polar-orbiting meteorological satellite in my country. It is equipped with three passive microwave remote sensing instruments (also collectively referred to as microwave radiometers), including microwave thermometer, microwave hygrometer and microwave imager. Microwave radiometer is a passive microwave remote sensing instrument. It detects the characteristics of the target by receiving the microwave energy radiated by the measured object. The relationship between the microwave energy radiated by the object and the brightness temperature of the object (abbreviated as brightness temperature) can be completely determined by...

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Application Information

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IPC IPC(8): G01D21/00G01K15/00
Inventor 李叶飞杨勇叶擎昊赵其昌
Owner SHANGHAI SATELLITE ENG INST
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