Inversion method of meteor echo signal in wind finding radar detection

Abstract

The invention provides an inversion method of a meteor echo signal in a wind finding radar detection. The method comprises the following steps: obtaining an electron density function changing along with time and radius in meteoric trail according to an input initial radius and a bipolar diffusion coefficient; according to the electron density function, calculating the electron density of all electron micelles within a certain radius range by taking the meteor flight axis as the center; according to the electron density of the single electron micelles, the echo electric field intensity of the single electron micelles is calculated in combination with radar hardware parameters; performing triple integration and coherent processing on the echo electric field intensity of all the electron micelles to obtain an echo coherence function of the electron group in the meteoric trail; constructing gaussian noise and a certain signal-to-noise ratio sequence, combining the echo coherence function and the Gaussian noise according to the signal-to-noise ratio sequence, and obtaining different meteor echo analog signals. The meteoric trail echo signal simulation method well simulates the meteoric trail echo signal in radar detection, and provides a reliable model for subsequent exploration and verification of physical parameters related to meteoric events.

Description

technical field [0001] The invention relates to the technical field of space detection, in particular to an inversion method for meteor echo signals in wind radar detection. Background technique [0002] The meteoroid rushes into the earth's atmosphere at a speed of 11.2-72.8km / s. Within the altitude range of 100-300km, the thin atmosphere preheats the meteoroid, making its temperature rise rapidly within a few seconds, and then melting and vaporization occur. Phase transition, final ablation at altitudes of 70-120km. Gasified meteor atoms collide violently with atmospheric molecules to ionize, forming a plasma column along with the flight of the meteoroid, which is often called meteor trail. Meteor trails will spread rapidly after they are formed. Studies have shown that bipolar diffusion is the most important role in the diffusion process. Therefore, the physical process of bipolar diffusion determines the nature of meteor trail echo signals to a large extent. [0003] T...

AI Technical Summary

Problems solved by technology

However, there is no systematic and comprehensive retrieval method for the echo signal of less dense meteor trails in radar detection.

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