Ionospheric Electron Density Retrieval Method Based on Clean Algorithm

Abstract

The invention belongs to the field of signal and information processing, and specifically relates to an ionospheric electron density inversion method, system, and device based on the CLEAN algorithm, aiming at solving the large amount of calculation of incoherent scattered plasma spectral lines and the insufficient accuracy of electron density profile inversion The problem. The method of this system includes: obtaining the IQ digital signal; extracting and deleting the signal part collected during the pulse transmission in the IQ digital signal, and constructing a two-dimensional matrix; decoding and calculating the signal power spectrum of each range gate height through the frequency domain FFT algorithm; iteratively obtaining each distance Accumulate the power spectrum data of the gate height, and denoise through the system frequency response function; deconvolute the denoised power spectrum data based on the CLEAN algorithm; obtain the plasma spectral line of the entire height profile by the spline interpolation method, and The ionospheric electron density profile was obtained by fitting the Langmuir dispersion relation. The invention improves the real-time calculation of plasma spectral lines and the precision of electronic density profile inversion.

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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