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Portable high-frequency ground wave radar radio frequency interference inhibition method

A high-frequency ground wave radar and radio frequency interference technology, applied in the field of radar interference, can solve the problems of lack of polarization information, beam width, etc., and achieve the effects of strong correlation, good suppression effect, and good suppression effect

Inactive Publication Date: 2018-01-09
WUHAN UNIV
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Problems solved by technology

but due to the wide beam of portable HF SWR and the lack of polarization information, these methods will fail

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  • Portable high-frequency ground wave radar radio frequency interference inhibition method
  • Portable high-frequency ground wave radar radio frequency interference inhibition method
  • Portable high-frequency ground wave radar radio frequency interference inhibition method

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Embodiment Construction

[0021] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] This embodiment is realized by adopting the following technical scheme, a portable high-frequency ground wave radar radio frequency interference suppression method, the high-frequency ground wave radar uses two monopole cross-loops as receiving antennas; each monopole cross-loop antenna A monopole antenna and two crossed loop antennas are included; the radio frequency interference suppression method includes the following steps:

[0023] Step 1. Perform channel calibration on two monopole cross-loop antennas;

[0024] Step 2, in each sweep cycle, identify radio frequency interference;

[0025] Step 3, in the frame period in which there is interference, first, for the monopole antenna channels of the two monopole cross-loop antennas, the data matrix of the interference is constructed using the data of the long-distance element; then the covarian...

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Abstract

The invention relates to the radar interference technology field, and concretely relates to a portable high-frequency ground wave radar radio frequency interference inhibition method. Two monopole crossed rings are adopted by a high frequency ground wave radar receiver to serve as reception antennas. After channel calibration, radio frequency interference takes place in monopole channels of the two monopole crossed rings and in two respective crossed ring channels. A spatial domain subspace projection method is adopted to realize interference inhibition: setting a threshold and determining whether each frame includes radio frequency interference; and for frame periods with radio frequency interference, obtaining a radio frequency interference sample through signals of long-distance elements only containing interference, extracting a sub-space of radio frequency interference through Eigen value decomposition, and for signals of near-distance elements containing radio frequency interference and sea state information, projecting the signals onto an orthogonal sub-space of the sub-space of radio frequency interference to inhibit interference. The method has a great inhibition effect for dense radio frequency interference, and ensures that arrival angle results of monopole crossed ring antennas, estimated by a MUSIC algorithm, are reliable after interference inhibition.

Description

technical field [0001] The invention belongs to the technical field of radar interference, and in particular relates to a method for suppressing radio frequency interference of a portable high-frequency ground wave radar. Background technique [0002] High-frequency surface wave radar is widely used in the inversion of ocean surface parameters such as current field, wave height spectrum, and wind information, and can provide useful ocean state information in large areas of the ocean in real time. Since the CODAR company proposed the monopole cross-loop receiving antenna, the portable high-frequency ground wave radar has been widely used. However, since a large number of high-frequency radio devices share high-frequency bands, high-frequency ground wave radars face a very important problem of radio frequency interference. High-frequency radio frequency interference is very frequent and often covers up useful echo signals, including sea state and hard targets. Therefore, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02G01S7/36
Inventor 文必洋田震赵久瑞王思捷李子言
Owner WUHAN UNIV
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