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Narrowband interference suppressing method based on transform domain filtering

A narrow-band interference and transform domain technology, applied in radio wave measurement systems, satellite radio beacon positioning systems, measurement devices, etc., 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: 2017-03-22
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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  • Abstract
  • Description
  • Claims
  • 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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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 a narrowband interference suppressing method based on transform domain filtering. The method is designed for a complex electromagnetic interference environment. The characteristic that narrowband interference damages evenness of original sampling signal frequency spectrum is utilized to identify and eliminate the narrowband interference according to different situations. Possibility of cascade use with spatial domain filtering is taken into consideration to deal with multi-channel parallelization situation. The design of FFT transformation is optimized. The method is suitable for cascade working with a spatial domain filtering method, and narrowband interference can be effectively eliminated when 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 Applications(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