Outer radiation source radar cofrequency interference elimination method

A technology of external radiation source radar and co-frequency interference, which is applied in the field of radar and can solve problems such as no effective elimination.

Active Publication Date: 2016-10-26
XIDIAN UNIV
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  • Application Information

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Problems solved by technology

However, there are cases where the direction of arrival of the co-channel interference and the target echo are located in the same main lobe. In this case, the existing spatial filtering algorithm is no longer applicable.
For co-channel interference in the main lobe, there is no effective elimination method at present

Method used

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  • Outer radiation source radar cofrequency interference elimination method
  • Outer radiation source radar cofrequency interference elimination method
  • Outer radiation source radar cofrequency interference elimination method

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Embodiment Construction

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0021] In addition, in order to clearly describe the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, words such as "first" and "second" are used to distinguish the same or similar items with basically the same function and effect, Those skilled in the art can understand that the words "first", "second", etc. do not limit the quantity and execution order.

[0022] For ease of understanding, the follo...

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Abstract

The invention belongs to the radar technology field and discloses an outer radiation source radar cofrequency interference elimination method. The method comprises steps that a reference signal received by a reference antenna and M echo signals received by an array element antenna are acquired; direct wave signals and multi-path signals of the M echo signals are eliminated by utilizing the reference signal to acquire M first echo signals, and an echo signal matrix is constructed; independent component analysis on the echo signal matrix is carried out to acquire three independent component signals; the three independent component signals are utilized to carry out three times of time domain interference elimination for the echo signal matrix to acquire three second echo signals; distance-Doppler two-dimensional correlation for each second echo signal and the reference signal is carried out to acquire three correlation matrixes, target detection is carried out by utilizing the correlation matrixes, second echo signals corresponding to the correlation matrixes of the target information can be acquired, namely echo signals after cofrequency interference elimination. The method is advantaged in that cofrequency interference in a main lobe can be effectively eliminated, and a relatively good target detection result is acquired.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a method for eliminating co-frequency interference of external radiation source radar. Background technique [0002] External radiation source radar uses a third-party radiation source signal (such as FM broadcast signal, analog TV signal, communication signal, etc.) as an illumination source to illuminate the target for detection, and its detection process is passive detection. Therefore, for external radiation radar, compared with interference and noise, its target echo signal is very weak, so the suppression degree of interference and noise will directly affect the detection performance of external radiation radar. [0003] Interference under the external radiation source radar system includes coherent interference and non-coherent interference. Among them, coherent interference refers to direct wave interference and multipath interference, and non-coherent interference refers t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36G01S7/41
CPCG01S7/36G01S7/41
Inventor 王俊郭帅邓亚琦
Owner XIDIAN UNIV
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