Anti-interference method and system

A narrow-band interference and branch technology, applied in anti-interference, anti-interference method and system field of narrow-band interference pre-filtering, can solve the problems of insufficient precision, complex design and implementation, loss of phase information, etc., to reduce the number of effective bits, reduce Resource consumption, effect of increasing degrees of freedom

Inactive Publication Date: 2016-05-11
SPACE STAR TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Space-frequency joint anti-jamming is the current anti-jamming method with better anti-jamming performance. A large number of domain data bits will result in insufficient precision or high resource usage during anti-interference processing
[0004] An anti-jamming method in the prior art adopts frequency domain and space domain cascading method. Firstly, the frequency domain method is used to suppress narrowband interference, and then beamforming is realized in the space domain. The implementation process needs to be transformed into

Method used

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Embodiment 1

[0031] This embodiment provides a processing flow of an anti-jamming method such as figure 1 As shown, the following processing steps are included:

[0032] Step S11, filtering out the narrow-band interference of the immediate branch frequency domain signal and the delayed branch frequency domain signal;

[0033] Step S12, randomly select a branch frequency domain signal from the immediate branch frequency domain signal and the delayed branch frequency domain signal that have been pre-filtered by narrowband interference, and obtain the anti-interference filtering weight of the branch frequency domain signal ;

[0034] Step S13 , using the anti-interference filtering weights to perform anti-interference filtering processing on the frequency-domain signals of the immediate branch and the delay branch that have undergone the narrowband interference pre-filtering process respectively.

Embodiment 2

[0036] This embodiment provides a processing flow of an anti-jamming method such as figure 2 As shown, the following processing steps are included:

[0037] Step S21, dividing the baseband digital time-domain signal into the time-domain signal of the immediate branch and the time-domain signal of the delayed branch, and performing segmental windowing processing on the time-domain signal of the immediate branch and the time-domain signal of the delayed branch respectively Perform FFT transformation to obtain the frequency domain signals of the immediate branch and the delayed branch.

[0038] Acquiring the time-domain signal of the delay branch includes performing delay processing on the immediate branch to become a time-domain signal of the delay branch.

[0039] In this embodiment, one-half delay processing is performed on the immediate branch, and those skilled in the art should understand that the above-mentioned one-half delay processing on the immediate branch is only a...

Embodiment 3

[0064] This embodiment provides a module composition of an anti-jamming system such as figure 2 As shown, its specific implementation structure is as follows figure 2 As shown, specifically, the following modules may be included: a narrowband interference pre-filtering module 31, an anti-interference weight acquisition module 32 and an anti-interference filtering module 33; wherein,

[0065] A narrowband interference pre-filtering module 31 is used to pre-filter the narrowband interference of the immediate branch frequency domain signal and the delayed branch frequency domain signal;

[0066] Further, the narrowband interference pre-filtering module is used for zeroing out the amplitude of the interference spectrum when the amplitude of the interference spectrum is greater than the narrowband anti-interference threshold, so as to filter out the narrowband interference. The narrowband anti-interference threshold is set according to the number of data bits occupied by the str...

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Abstract

The invention discloses an anti-interference method. The method includes the following steps that: narrowband interference of instant branch frequency-domain signals and time-delayed branch frequency-domain signals are filtered out; the anti-interference filter weight of the instant branch frequency-domain signals or time-delayed branch frequency-domain signals of which the narrowband interference is filtered out is calculated; and anti-interference filtering processing is performed on the instant branch frequency-domain signals and the time-delayed branch frequency-domain signals of which the narrowband interference is filtered out by using the anti-interference filter weight. The invention also provides an anti-interference system. With the anti-interference method and the system of the invention adopted, the significant digits of anti-interference input signals can be effectively reduced, resources required by back-end processing can be decreased, the degree of freedom of anti-interference can be increased, and an anti-interference ability can be still enabled when the total amount of broadband interference and narrowband interference is greater than the number of array elements.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, to an anti-jamming method and system, in particular to an anti-jamming method and system for pre-filtering narrow-band interference. Background technique [0002] Wireless communication technology plays an increasingly important role in the field of modern communication, but because the wireless signal is extremely weak, it is vulnerable to various natural or man-made interferences and cannot be used. Therefore, it is necessary to introduce interference suppression technology to improve the resistance of wireless communication systems. Interference ability. In view of the limited anti-jamming effect of the current anti-jamming technology purely in the air domain, time domain, and frequency domain, it is necessary to use a combination of multiple anti-jamming methods. [0003] Space-frequency joint anti-jamming is the current anti-jamming method with better anti-jamming per...

Claims

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Application Information

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IPC IPC(8): G01S19/21
Inventor 魏婵娟张春水朱静刘鹏李东俊
Owner SPACE STAR TECH CO LTD
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