Mid-latitude ionized layer detection method based on high-frequency ground wave radar

Abstract

The invention discloses a mid-latitude ionized layer detection method based on a high-frequency ground wave radar. The method comprises the following steps: step 1, according to an echo RD spectrum ofa high-frequency ground wave radar under an FMPCW system, estimating the electron concentration of an ionospheric irregular body through a function relationship that the echo power of the ionosphericirregular body is in direct proportion to the electron concentration of the ionospheric irregular body in combination with an IRI model or a vertical measuring instrument; step 2, estimating the plasma frequency of the ionospheric irregular body according to the electron concentration estimation of the ionospheric irregular body; and step 3, according to the RD spectrum of the high-frequency ground wave radar echo, estimating a refraction index of the high-frequency ground wave radar echo through the ionospheric irregular body plasma frequency estimation value, and then correcting an irregular Doppler frequency shift to realize estimation and variance estimation of the irregular body drift speed along the radial direction of the radar. The ionospheric detection function is added to the existing high-frequency ground wave radar, and a novel application field of the high-frequency ground wave radar is developed.

Description

Technical field [0001] The invention belongs to the field of high-frequency ground wave radar and ionospheric detection, and relates to a method for detecting mid-latitude ionosphere by using high-frequency ground wave radar. Background technique [0002] High frequency ground wave radar is a new system radar that uses the physical mechanism of high frequency (3~30MHz) vertically polarized electromagnetic waves to diffuse and propagate along the coast to realize ocean remote sensing and beyond-horizon target detection. The high frequency ground wave radar uses vertical polarization to launch, and the beam elevation angle is as low as possible. Ideally, electromagnetic waves should propagate completely along the coast. However, due to practical engineering factors such as complex ground characteristics and antenna design, part of the electromagnetic waves radiate into the ionosphere. After reflection and refraction, it returns to the radar receiver along various propagation paths,...

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Problems solved by technology

However, it is not realistic to deploy dense vertical survey observation stations in the Wanli sea area

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