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Method for obtaining satellite surface potential based on multi-time-scale particle push

A surface potential, multi-time scale technology, applied in the field of space applications, can solve problems such as large amount of calculation, and achieve the effect of saving computing time, improving computing efficiency, and saving computing amount

Active Publication Date: 2014-12-24
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the PIC method needs to track a large number of charged particles, so there is a disadvantage of a large amount of calculation
Excessive calculation has become the most important factor limiting the application of PIC method in satellite surface potential simulation calculation

Method used

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  • Method for obtaining satellite surface potential based on multi-time-scale particle push
  • Method for obtaining satellite surface potential based on multi-time-scale particle push
  • Method for obtaining satellite surface potential based on multi-time-scale particle push

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0053] 1. Determine the space environment parameters where the satellite is located, and determine the Debye length of the plasma according to the space environment parameters:

[0054] For the surface potential PIC non-uniform grid simulation analysis of satellites in geostationary orbit, the typical environmental parameters of GEO orbit are used, the electron temperature is 10keV, and the electron density is 10 6 / m 3 , the ion temperature is 29keV, and the ion density is 10 4 / m 3 , its Debye length is about 700m, and the calculated thermal velocity of electrons and protons in the space plasma is 5.9×10 7 m / s and 1.38×10 6 m / s.

[0055] 2. Determine the size of the calculation space around the satellite: an area of ​​1000m×1000m around the satellite.

[0056] 3. Divide the simulation space. In this embodiment, the simulation space is divided into two space regions. The size of the calculation area selected by the first space region (coarse grid region) is the simulatio...

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Abstract

The invention discloses a method for obtaining satellite surface potential based on multi-time-scale particle push. A division method of different mesh sizes is adopted at different regions for a simulation space according to space plasma characteristic and satellite size, namely fine mesh division is adopted at a region close to a satellite, and coarse mesh division is adopted at a region away from the satellite; thus, the operation time is saved to a great extent on the premise of guaranteeing certain computing accuracy, and the contradiction between the computing efficiency and accuracy of PIC (Particle-In-Cell) surface charge simulation analysis of a geostationary orbit is solved better; electrons and ions are pushed by using different time steps respectively, nearly half of the computation can be saved on the premise of guaranteeing the computing accuracy, and the computing efficiency is improved.

Description

technical field [0001] The invention relates to space application technology, in particular to a method for obtaining satellite surface potential based on multi-time-scale particle propulsion. Background technique [0002] The interaction of satellites with the space plasma in geostationary orbit collects electrons and ions in the plasma, creating a surface electrification effect. In the overall design stage of the spacecraft, through simulation calculation of the surface potential distribution of the satellite, find out where the discharge may occur and improve it, which can effectively reduce the cost of research and development and improve the reliability of the spacecraft. [0003] In the analysis and calculation of the interaction between satellites and space plasma, two methods, magnetic fluid and particle simulation, are generally used. The particle simulation (PIC) numerical analysis method is a powerful numerical calculation method based on the dynamic plasma model...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 汤道坦杨生胜李得天秦晓刚柳青赵呈选陈益峰史亮
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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