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Method for assessing radiation dose rate of earth-orbiting satellite

A technology of radiation dose rate and earth orbit, applied in the field of satellite on-orbit space radiation environmental effect management

Active Publication Date: 2016-06-22
昆山中科空间科技有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of evaluating the spatial distribution of the low dose rate in space in order to solve the low dose rate enhancement effect of the bipolar device, and the present invention provides an evaluation method for evaluating the satellite radiation dose rate

Method used

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  • Method for assessing radiation dose rate of earth-orbiting satellite
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  • Method for assessing radiation dose rate of earth-orbiting satellite

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Embodiment

[0039] The particle transport calculation tool involved in the following embodiments uses Geant4, the structural material of the spacecraft is aluminum, and the material of the sensitive area of ​​the device is silicon. However, the selection of particle transport calculation tools is not unique, and MCNP or EGS can also be used. The structural materials of the spacecraft and the sensitive area materials of the devices are constantly changing with the development of technology. This embodiment only For the convenience of description, only one material is used as an example, but a simple replacement of the material will not lead to substantial differences in the scheme.

[0040] Based on the assumption in the previous paragraph, the method for evaluating the satellite radiation dose rate provided in this embodiment specifically includes:

[0041] Step 1: Use Geant4 to calculate the energy-range table of the incident depth of space particles of different energies in the Al mater...

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Abstract

The invention provides a method for assessing a radiation dose rate of an earth-orbiting satellite. The method comprises the steps of step 101, by taking an actually measured spatial particle number in a period of time as a continuous dynamic input, calculating the depths of particles with different energy in a satellite structure material and energy deposition of the particles with the different energy in a device sensitive region material by adopting a particle transport calculation tool, and forming forms separately; according to a spatial flux spectrum of the spatial particle input and in combination with a depth relationship of the spatial particles in the satellite structure material, calculating a flux spectrum of the spatial particles in a target position; step 102, after the flux spectrum of the spatial particles in the target position is obtained, in combination with an energy deposition relationship of the spatial particles with the different energy in the device sensitive region material, obtaining an energy deposition surface density sum of the spatial particles in the device sensitive region material in the target position; and step 104, according to the energy deposition surface density sum and the density of the device sensitive region material, calculating the radiation dose rate of the spatial particles in the target position.

Description

technical field [0001] The invention relates to the field of satellite in-orbit space radiation environmental effect management, in particular to a method for evaluating the radiation dose rate of earth orbit satellites. Background technique [0002] Elements such as high-energy electrons, high-energy protons, and heavy ions in the space radiation environment will cause radiation effects on satellites, especially high-energy electrons and high-energy protons, whose flux is greater than that of heavy ions. In the process of passing through matter, space particles will lose energy due to the resistance formed by the nucleus and extranuclear electrons, and the lost energy will be transferred to the blocking matter, resulting in the gradual dissimilation of the matter receiving the energy or the appearance of the device. Performance degradation, known as ionizing radiation dose effect. The radiation dose that a substance receives in a unit time is called the dose rate. When the...

Claims

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Application Information

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IPC IPC(8): G06F19/00G01T1/00
Inventor 杨垂柏曹光伟张贤国荆涛张斌全孔令高张珅毅梁金宝孙越强
Owner 昆山中科空间科技有限公司
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