Self-adaption side lobe cancellation method based on recognition processing

An adaptive and cancellation technology, applied to radio wave measurement systems, instruments, etc., can solve problems such as interference suppression, no analysis and selection of adaptive sidelobe cancellation methods, and inability to use adaptive sidelobe cancellation methods. Achieving good cancellation performance

Active Publication Date: 2014-06-25
XIDIAN UNIV
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Problems solved by technology

However, when the interference is intermittent or deceptive, the sampling data in the rest period may contain less interference signals, and the number of learning samples that can be used is small, and the adaptive sidelobe cancellation system will basically fail
In addition, when the radar is working in pulse Doppler mode, since there is no rest period, the adaptive sidelobe cancellation method cannot be used to suppress interference
These problems are all because the traditional adaptive sidelobe cancellation method does not analyze and select samples

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  • Self-adaption side lobe cancellation method based on recognition processing
  • Self-adaption side lobe cancellation method based on recognition processing
  • Self-adaption side lobe cancellation method based on recognition processing

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with accompanying drawing:

[0026] combine first figure 1 A description of the adaptive sidelobe cancellation technique is given in figure 1 Among them, the nth sampling signal of the main antenna receiving signal is d(n), the nth sampling signal of the auxiliary receiving signal is X(n), W is the adaptive weight coefficient at the corresponding time, and y(n) is the corresponding time The output of the adaptive sidelobe cancellation system,

[0027] y(n)=d(n)-y a (n),y a (n)=W T X(n),

[0028] Among them, in the main antenna response, auxiliary antenna response and integrated system response, θ d is the direction of arrival of the desired signal, θ I is the direction of arrival of the interfering signal.

[0029] The traditional adaptive sidelobe cancellation method can only complete the cancellation of continuous wave interference and high duty cycle interference, but the present invention c...

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Abstract

The invention belongs to the radar interference inhibition technology field and discloses a self-adaption side lobe cancellation method based on recognition processing. The self-adaption side lobe cancellation method based on the recognition processing comprises steps of utilizing a main antenna and an auxiliary antenna of the radar to receive backwave signals in a pulse repeated cycle to obtain main antenna reception signals and auxiliary antenna reception signals, performing first time of signal screening and second time of signal screening according to the main antenna reception signals and the auxiliary antenna reception signals to obtain an effective study sample, utilizing a direct matrix inversion algorithm to perform self-adaption weight calculation and obtain a corresponding weight by aiming at the effective study sample, and utilizing the self-adaption weight W to perform side lobe cancellation on the main antenna reception signal and the auxiliary antenna reception signal to obtain the self-adaption side lobe cancellation result.

Description

technical field [0001] The invention belongs to the technical field of radar interference suppression, in particular to an adaptive sidelobe cancellation method based on cognitive processing, which can be used to suppress various types of active interference entering through antenna sidelobes. Background technique [0002] The role of electronic countermeasures in modern warfare is becoming more and more important. Radar without anti-jamming completely loses its functions of finding and measuring enemy targets and controlling guided firearms. Therefore, in a sense, anti-jamming measures are necessary or even the primary normal working condition of radar. There are many types of electronic interference, but most of them enter the receiver through the side lobe of the radar antenna. When the radar is in a strong interference environment, the side lobe interference can drown the target signal of the main beam, thus greatly affecting the performance of the radar system. One of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/2813G01S7/36
Inventor 赵永波朱玉堂刘宏伟水鹏朗程增飞李慧
Owner XIDIAN UNIV
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