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Short-time atmosphere model modification method based on measured atmospheric density

A technology of atmospheric density and atmospheric model, applied in the direction of measuring devices, specific gravity measurement, instruments, etc., can solve the problem that there are not many methods for atmospheric model correction, and achieve the effect of improving the prediction accuracy

Inactive Publication Date: 2017-09-05
CHINA XIAN SATELLITE CONTROL CENT
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Problems solved by technology

The current atmospheric density detection results are mainly used to study space atmospheric composition or environmental evolution analysis, and there are not many methods for using the detection results to calculate spacecraft orbits and correct existing atmospheric models

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  • Short-time atmosphere model modification method based on measured atmospheric density
  • Short-time atmosphere model modification method based on measured atmospheric density
  • Short-time atmosphere model modification method based on measured atmospheric density

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Embodiment Construction

[0008] The present invention will be further described below in conjunction with the examples, and the present invention includes but not limited to the following examples.

[0009] Generally speaking, during periods of calm solar activity and geomagnetic activity, it can be considered that the measured atmospheric density (considering the accuracy of the measured density) is closer to the actual situation than the atmospheric density calculated by the model. It is mainly based on the measured atmospheric density known for a period of time, to find the relationship between the existing atmospheric density model and the measured density model, and to establish a short-term correction model. Here, we choose the MSIS2000 atmospheric density model and find a model matching principle to make the density model close to the measured density. The specific method is as follows:

[0010] (1) Perform linear fitting on the atmospheric model density value and the measured density value res...

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Abstract

The invention provides a short-time atmosphere model modification method based on measured atmospheric density. The method comprises the following steps: selecting an atmosphere density model, and collecting and calculating measured atmospheric density in a set duration; respectively performing linear fitting on the density value of the atmosphere model and the measured density value so as to obtain a measured atmospheric density fitted curve and a model density fitted curve; calculating an included angle between the measured atmospheric density fitted curve and the model density fitted curve; and rotating the model density fitted curve point by point, thereby obtaining a time value t' after rotation and a selected atmosphere model density value after rotation. According to the method disclosed by the invention, the measured atmospheric density value is introduced into orbit calculation, and the spacecraft orbit forecast accuracy is well improved.

Description

technical field [0001] The invention belongs to the field of aerospace measurement and control, and relates to an atmospheric model correction method. Background technique [0002] The movement of spacecraft in low-Earth orbit is obviously affected by the perturbation of atmospheric resistance. The decisive factor of perturbation of atmospheric resistance is the value of atmospheric density. The inhomogeneity of atmospheric density causes the spacecraft to experience different atmospheric resistance at different flight altitudes. Atmospheric density values ​​currently used for orbit calculations are obtained through model calculations. Commonly used atmospheric models include DTM, JACHIA, MSIS and other series. Generally speaking, the error of the calculation results of the atmospheric density is generally 10% to 20%. During the period of active solar activity and geomagnetic storm, the error of the calculation of the atmospheric density will even double or more, which serio...

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Application Information

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IPC IPC(8): G01N9/36
CPCG01N9/36
Inventor 杜凯张荣之王西京杨永安许可袁勇田涛
Owner CHINA XIAN SATELLITE CONTROL CENT
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