A Method of Surface Atmospheric Density Measurement Based on X-ray Absorption

Abstract

The invention discloses a ground atmospheric density measurement method based on X-ray absorption. The method includes: placing an X-ray source and an SDD detector coaxially, moving the position of the SDD detector along the axis, and setting the SSD detector according to the channel Number, obtain the energy spectrum count, and perform energy calibration, quantum efficiency calibration, dead time calibration, and divergence angle calibration on it to obtain the calibrated energy spectrum count; the X-ray source emits X-ray photons, and according to the transmission of X-ray photons in the atmosphere The radiation attenuation of the X-ray photon counting is used to obtain the Poisson statistical maximum likelihood estimation using the Poisson statistical property of X-ray photon counting; Bayesian estimation is performed on the calibrated energy spectrum counting and Poisson statistical maximum likelihood estimation to obtain the surface atmospheric density estimated value.

Description

technical field [0001] The invention relates to the technical field of space detection, in particular to a ground atmospheric density measurement method based on X-ray absorption. Background technique [0002] The earth's middle and upper atmosphere is the transitional region of the earth's atmosphere, which is affected by solar activity on the upper side and lower by the earth's lower atmosphere and geomagnetic activity. The structure of the middle and upper atmosphere and its changing laws are important scientific issues. The density of the middle and upper atmosphere is an important parameter of the structure of the middle and upper atmosphere. The measurement of the density of the middle and upper atmosphere is of great significance to the study of the structure of the middle and upper atmosphere and its changing law. In addition, for spacecraft and aircraft flying across the atmosphere, the density of the middle and upper ground atmosphere is an important input paramete...

AI Technical Summary

Problems solved by technology

The measurement of the atmospheric density at the middle and upper levels needs to be able to cover the altitude range of tens of kilometers to one hundred kilometers. However, the current existing technology cannot reach the altitude range of tens of kilometers to one hundred kilometers.

[0003] The patent of this invention aims at the ground test verification of X-ray occultation technology, and proposes an atmospheric density measurement method based on X-ray absorption. At present, the existing technology does not involve the ground test verification of X-ray occultation technology. measurement method or detection technique

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