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Mars atmosphere three-dimensional density obtaining method based on data fitting

An atmospheric density and data fitting technology, applied in the field of deep space exploration, can solve the problems of high speed, small amount of calculation, low precision, etc., and achieve the effects of short calculation time, small storage capacity and simple form

Inactive Publication Date: 2014-10-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

Although the simplified model is simple in form, the amount of calculation is small and the speed is fast, it does not reflect the change of density at the horizontal level, so the accuracy is low

Method used

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  • Mars atmosphere three-dimensional density obtaining method based on data fitting
  • Mars atmosphere three-dimensional density obtaining method based on data fitting
  • Mars atmosphere three-dimensional density obtaining method based on data fitting

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Embodiment Construction

[0043] In order to better illustrate the purpose and advantages of the present invention, the content of the invention will be further described below in conjunction with the accompanying drawings and examples.

[0044] In this example, 0-125km is divided into five layers, and the latitude and longitude are divided according to the interval of 2°. The order of the fitting polynomial is taken as 18th order, and the coefficients of the polynomial are obtained by least squares surface fitting, so as to obtain the calculation of the atmospheric density model formula.

[0045] Step 1: Meshing

[0046]Get density data on a spatial node. On the vertical direction of 0-125km (that is, the height layer), select 29 height surfaces and divide the 29 height surfaces into 5 height layers. The heights of the first layer to the fifth layer are: 0-19km, 19 ~24km, 24~65km, 65~100km, 100km~125k. For each height plane, the latitude and longitude are uniformly divided into grids at intervals o...

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Abstract

The invention relates to a Mars atmosphere three-dimensional density obtaining method based on data fitting and belongs to the technical field of deep space exploration. In the perpendicular direction, a layered index model is adopted, the atmosphere is divided into k layers, and the atmosphere density of each layer represents an index law along with changes of height, namely the atmosphere density of each layer can be fitted through an exponential function. Meanwhile, the reference density and reference height in the exponential function are regarded as a polynomial function of the longitude and latitude, the polynomial coefficients are obtained in a fitting mode through a least square method, and the information of the longitude and latitude is introduced into a density model. The Mars atmosphere three-dimensional density model has an analytical expression, the form is simple, the calculation time is short, the storage space is small, and the model is applicable to real-time ground simulation.

Description

technical field [0001] The invention relates to a method for acquiring the three-dimensional density of Martian atmosphere based on data fitting, and belongs to the technical field of deep space exploration. Background technique [0002] Atmospheric density on Mars is the main atmospheric parameter used in the Mars landing simulation, especially in the entry section, the atmospheric density will affect the aerodynamic force, which in turn is related to the accuracy of the dynamic model. Establishing an accurate Martian atmospheric density model for ground-based real-time simulation verification is critical to the success of the landing mission. [0003] The existing Martian atmospheric models mainly include two types, the Martian atmospheric database and the Martian atmospheric simplified model. The Mars Atmospheric Database is constructed based on the Mars atmospheric circulation model and actual mission data, and contains a wealth of data information. Currently, it mainly...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 朱圣英秦同王硕高艾崔平远
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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