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Narrowband Interference Suppression Method Based on Transform Domain Filtering

A technology of narrowband interference and transformation domain, applied in the field of narrowband interference suppression, can solve the problems of difficult identification and elimination of interference, and achieve the effect of improving capabilities and reducing resource consumption

Active Publication Date: 2018-10-19
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The present invention solves to a certain extent the problem that interference is difficult to identify and eliminate in a complex interference environment

Method used

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  • Narrowband Interference Suppression Method Based on Transform Domain Filtering
  • Narrowband Interference Suppression Method Based on Transform Domain Filtering

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] The narrowband interference suppression method based on transform domain filtering, the above method converts the sampled signal to the frequency domain through the transform domain, and analyzes the composition characteristics of the spectrum while identifying the narrowband interference, then removes the narrowband interference, and finally removes the interfered signal Returning to the time domain is characterized in that it comprises the following steps:

[0026] (1) Two channels of original sampling low-IF frequency signals in the time domain a sig signal and b sig After normalization, the signals are divided into punctual branch signals and delayed branch signals: the first punctual branch signal a, the second punctual branch signal b, and the first delayed branch signal a delay and the second delayed branch signal b delay ;

[0027] (2) N(N=2) is perf...

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Abstract

The invention discloses an improved narrow-band interference suppression method based on transform domain filtering, which is designed for complex electromagnetic interference environments, uses narrow-band interference to break the characteristics of the flatness of the original sampling signal spectrum, and identifies narrow-band interference in different situations And culling, while considering the possibility of cascaded use with spatial filtering, specifically dealing with the case of multi-channel parallelism, the design and implementation of FFT transformation has been optimized. This method is suitable for cascading work with the spatial domain filtering method, and can effectively eliminate narrowband interference under the condition that both narrowband interference and broadband interference exist simultaneously.

Description

technical field [0001] The invention relates to a narrow-band interference suppression method for a satellite navigation receiver, which can be effectively cascaded with wide-band interference suppression algorithms such as airspace filtering, and improves the ability of interference suppression. Background technique [0002] At present, the narrow-band interference suppression method based on transform domain filtering mainly eliminates frequency points different from the normal spectrum according to the characteristics of the signal spectrum without interference. However, since the actual interference situation may be more complicated, there may be multiple narrowband and broadband interference sources at the same time, which requires an effective strategy for complex situations. Contents of the invention [0003] The purpose of the present invention is to propose a narrowband interference suppression method for effectively eliminating the narrowband interference when mu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 杜辉张望池付海军
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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