Narrowband interference resisting system and method based on adaptive signal processing

An adaptive signal and interference system technology, applied in the field of satellite navigation signal processing, can solve problems such as receiver performance degradation and failure to work normally, and achieve the effect of improving positioning performance

Inactive Publication Date: 2015-04-08
XIAN HUAXUN MICROELECTRONICS
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Problems solved by technology

[0003] In order to overcome the defects in the prior art, the present invention provides an anti-narrow-band interference system and method based on adaptive signal processing, which filters out the narrow-band interference components in the received digital intermediate frequency signal, so as to solve the problems caused by interference in the receiver Slow performance or even non-working issues

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  • Narrowband interference resisting system and method based on adaptive signal processing
  • Narrowband interference resisting system and method based on adaptive signal processing
  • Narrowband interference resisting system and method based on adaptive signal processing

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[0015] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] For GNSS signals containing additive narrowband interference, such as figure 1 As shown, the digital intermediate frequency signal output by the radio frequency module contains narrowband interference components, and the anti-narrowband interference system processes the digital intermediate frequency signal, filters out the narrowband interference signal and outputs it to the GNSS receiver. The specific operation steps are as follows: First, use the power spectrum estimation module to perform spectrum analysis on the intermediate frequency signal, mainly to make unbiased estimation of the frequency of the interference signal, including the estimation of interference power and interference bandwidth, such as figure 2 As shown, it mainly includes two steps: autocorrelation calculation and interference ...

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Abstract

The invention discloses a narrowband interference resisting system and a narrowband interference resisting method based on adaptive signal processing. The narrowband interference resisting system based on the adaptive signal processing is located at the front end of a digital baseband, performs filtering processing on a digital intermediate frequency signal received by the narrowband interference resisting system based on the adaptive signal processing, and outputs the signal to the digital baseband after interference of the signal is filtered out. The narrowband interference resisting system based on the adaptive signal processing comprises a power spectrum estimation module of an interference signal, an interference reference signal generation module and an adaptive signal processing module. The narrowband interference resisting method based on the adaptive signal processing is directed at narrowband noise and continuous wave interference, and used to accurately detect, track and filter the interference signal. According to the narrowband interference resisting system and the narrowband interference resisting method based on the adaptive signal processing, useful signal components are retained to the utmost on the premise of filtering out the interference signal.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation signal processing, and in particular relates to an anti-narrow-band interference system and method based on adaptive signal processing. Background technique [0002] The receiving power of GNSS satellite signals after reaching the ground through long-distance space propagation is already very weak, coupled with the complex electromagnetic environment near the ground, GNSS receivers are easily affected by in-band interference, and the interference signals will block the receiver's reception of satellite signals with demodulation. For interference signals with an interference-to-signal ratio of less than 15dB and GNSS signals with a bandwidth of 2MHz, the receiver signal processing can effectively suppress interference after despreading, but for interference signals with strong power, the performance of the GNSS receiver will degrade, or even fail. Acquire and track GNSS satellite sign...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 王大鹏刘刚李文刚白杨王亮梁大伟周文益张科伟
Owner XIAN HUAXUN MICROELECTRONICS
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