Ionized layer electron density inversion method based on CLEAN algorithm

Abstract

The invention belongs to the field of signal and information processing, particularly relates to an ionized layer electron density inversion method, system and device based on a CLEAN algorithm, and aims to solve the problems of large incoherent scattering plasma spectral line calculation amount and insufficient electron density profile inversion precision. The method of the system comprises the following steps: acquiring an IQ digital signal; extracting and deleting a signal part acquired during pulse emission in the IQ digital signal, and constructing a two-dimensional matrix; decoding and calculating a signal power spectrum of each distance gate height through a frequency domain FFT algorithm; iteratively acquiring power spectrum data of each distance gate height for accumulation, and denoising through a system frequency response function; performing deconvolution on the denoised power spectrum data based on a CLEAN algorithm; obtaining a plasma spectral line of the whole height profile through a spline interpolation method, and obtaining an ionized layer electron density profile through Langmuir dispersion relation fitting. According to the invention, the real-time performanceof plasma spectral line calculation and the precision of electron density profile inversion are improved.

Description

technical field [0001] The invention belongs to the field of signal and information processing, and in particular relates to an ionospheric electron density inversion method, system and device based on a CLEAN algorithm. Background technique [0002] High-power VHF / UHF radar systems using very large antenna gains in ionospheric studies are called incoherent scatter radars. The mechanism of incoherent scattering is that when the emitted radar pulse is incident on each free electron in the ionosphere, it will cause the electron to oscillate and accelerate the electron, thereby causing the re-radiation of electromagnetic energy. This process is called Thomson scattering or incoherent scattering . Therefore, the incoherent scatter signal spectrum is a statistical measurement of the electromagnetic scattering caused by the thermal fluctuation of the ionospheric electron density by the incoherent scatter radar. [0003] The power spectrum of the echo signal scattered back after ...

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Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problems of the large amount of calculation of the existing incoherent scattered plasma lines and the insufficient accuracy of the inversion of the electron density profile, the first aspect of the present invention proposes a CLEAN algorithm based on The ionospheric electron density retrieval method, the method includes:

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