Space calibration method based on accurate micro phase change fixed point black body model

Abstract

The invention provides a space calibration method based on an accurate micro phase change fixed point black body model. An accurate numerical model is utilized to calibrate a melting point temperatureof a micro phase change fixed point black body and a platinum resistance thermometer carried in the micro phase change fixed point black body so as to cope with the change of the melting point temperature of the black body caused by the change of experimental conditions. Firstly, an accurate numerical model is established according to a black body and a fixed structure; through radiation temperature optical path adjustment, the melting point temperature value of the fixed point black body is transmitted to the micro phase change fixed point black body, and accurate phase change temperature data of the micro phase change fixed point black body at a gallium point is obtained through an interpolation method; the model is corrected through the temperature data, so that the influence of roughcontact surfaces, gaps and inaccurate material parameters on the model is eliminated; and finally, calculating is performed by utilizing the correction model to obtain the melting point temperatures at different fixed points. The method can be applied to on-orbit satellites and other situations where standard temperature measurement cannot be carried out.

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...

AI Technical Summary

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

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