An in-space calibration method based on an accurate miniature phase transition fixed-point blackbody model

A fixed point, black body technology, applied in the field of satellite earth observation, can solve the problems of difficulty in testing and difficult to achieve accurately, and achieve the effect of ensuring the accuracy of the model

Active Publication Date: 2021-01-26
NAT INST OF METROLOGY CHINA
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Problems solved by technology

In particular, in orbit, the fixation method, ambient temperature, and temperature control method of the blackbody in the satellite may be very different from those in the ground experiment, and it is difficult to accurately achieve the same conditions as the laboratory.
Laboratory measurements are no longer applicable, and poor experimental conditions in satellites make testing difficult

Method used

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  • An in-space calibration method based on an accurate miniature phase transition fixed-point blackbody model
  • An in-space calibration method based on an accurate miniature phase transition fixed-point blackbody model
  • An in-space calibration method based on an accurate miniature phase transition fixed-point blackbody model

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Embodiment Construction

[0022] In order to facilitate the understanding of the present invention, the embodiments of the present invention will be described below in conjunction with the accompanying drawings. Those skilled in the art should understand that the following description is only for the convenience of explaining the invention, not as a specific limitation of its scope.

[0023] Space observation satellites usually use infrared radiometers to observe the ground, and obtain high-precision, high-spatial-resolution ground information through atmospheric radiation models. In the working process of the infrared radiation thermometer, it is necessary to convert the brightness signal into an electrical signal, and then use the interpolation method to establish the corresponding relationship between the detector voltage and the target temperature. For the sake of illustration, the parameters of the radiometer take the Miami2001 infrared radiometer as an example, and of course other types of infrare...

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Abstract

The invention provides a space calibration method based on an accurate miniature phase transition fixed-point blackbody model. Using an accurate numerical model, the miniature phase change fixed-point blackbody melting point temperature and the platinum resistance thermometer carried inside are calibrated to cope with changes in the blackbody melting point temperature caused by changes in experimental conditions. Firstly, an accurate numerical model is established according to the black body and fixed structure. Through the radiation temperature optical path adjustment, the melting point temperature value of the fixed-point blackbody is transferred to the micro-phase-change fixed-point blackbody, and the more accurate phase-change temperature data of the micro-phase-change fixed-point blackbody at the gallium point is obtained by interpolation. The model is corrected by this temperature data to eliminate the impact of rough contact surfaces, voids, and inaccurate material parameters on the model. Finally, using the revised model to calculate the melting point temperature at different fixed points. The invention can be applied to the situation that the standard temperature measurement cannot be carried out on orbiting satellites and the like.

Description

technical field [0001] The invention relates to the technical field of satellite earth observation, in particular to a space calibration method based on an accurate miniature phase-transition fixed-point blackbody model. Background technique [0002] Earth observation is one of the most important application directions of satellite technology. A range of areas, including missile warning and battlefield assessment, play integral roles. [0003] Measuring long-term, accurate detection of ground information from space is a daunting task. In the space environment, the temperature measured by satellites will gradually deviate from the actual temperature. This problem not only seriously affects the accuracy and effective observation life of satellite observations, but also makes it difficult to establish an indisputable climate record for long-term trend prediction of climate models. In addition, there are measurement differences and related uncertainties in the uncalibrated obs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K15/00G01J5/52
CPCG01K15/005G01J5/53
Inventor 郝小鹏司马瑞衡宋健
Owner NAT INST OF METROLOGY CHINA
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