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A method for inversion of ocean surface currents by high-frequency space-ground wave radar

A space-ground wave and surface flow technology, applied in the field of radar, can solve problems such as errors in research results of space-ground wave sea state detection

Active Publication Date: 2019-12-24
WUHAN UNIV
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Problems solved by technology

Therefore, there are still large errors in the research results of space-ground wave and sea state detection based on the plane non-inclined ionospheric reflection model

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  • A method for inversion of ocean surface currents by high-frequency space-ground wave radar
  • A method for inversion of ocean surface currents by high-frequency space-ground wave radar
  • A method for inversion of ocean surface currents by high-frequency space-ground wave radar

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Embodiment Construction

[0067] The present invention will be further described in detail below in conjunction with examples. The implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0068] A high-frequency space-to-ground wave radar ocean surface current inversion method, the implementation method mainly includes radar echo signal preprocessing and specific implementation of the algorithm, specifically including the following steps,

[0069] Step 1: Ocean echo data preprocessing. On April 4, 2017, Wuhan University conducted a high-frequency space-to-ground wave radar networking experiment. The sky-wave transmitting station is located in Wuhan, and the ground-wave receiving stations are respectively located on a ship near Dongshan and Chihu in Fujian.

[0070] The echo data of the two receiving stations are processed separately. Including matched filtering of echo data, channel calibration, spectr...

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Abstract

The invention discloses an ocean surface current inversion method based on high-frequency sky-ground wave radar. The method provides an effective solution to the problems faced by sky-ground wave over-the-horizon radar such as ionosphere tilt, difficult-to-determine reflection point height and serious Doppler pollution. In view of the fact that different scattering elements correspond to differentreflection heights and ionosphere tilt angles, a Fourier series expansion algorithm is put forward to extract the first-order Bragg frequency of each scattering element in an antenna mode, common scattering elements are searched through traversal in a multi-station networked receiving mode, the pitch angle and the bi-static angle corresponding to each scattering element are calculated, and precise positioning is completed. The method is free from the assumption of non-tilted plane ionosphere. The detection error caused by ionosphere tilt and reflection point height change is eliminated. A novel inversion algorithm is provided for the inversion of ocean dynamic parameters in a sky wave mode. The detection accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a method for inversion of ocean surface flow by high-frequency space-to-ground wave radar, which is used to solve the problem that the state of the ionosphere faced by space-to-ground wave over-the-horizon radar is unknown so that accurate positioning is difficult to achieve. Background technique [0002] High-frequency space-to-ground wave over-the-horizon radar is a new remote sensing radar device suitable for large-scale ocean state monitoring. Because of its long detection distance and high signal-to-noise ratio, it has been widely used in target detection, ocean dynamics, etc. in recent years. Parameter inversion and other fields. [0003] The sky-ground wave over-the-horizon radar works in a new propagation mode of sky wave reflection / ground wave diffraction. The transmitter placed inland emits high-frequency radio waves and obliquely incident into the ionosphere,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/02
Inventor 吴雄斌李苗张兰岳显昌
Owner WUHAN UNIV
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