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Method for detecting and eliminating narrow-band interference by GNSS receiver

A narrowband interference and receiver technology, applied in the field of signal processing, can solve the problems of large amount of calculation and high complexity, and achieve the effect of small amount of calculation, reduced complexity, and reduced capture time

Active Publication Date: 2013-02-27
RDA TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This improved method does not need to know the frequency point of narrowband interference in advance, but the complexity of technical implementation is high, the amount of calculation is large, and it needs a certain stabilization time

Method used

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  • Method for detecting and eliminating narrow-band interference by GNSS receiver
  • Method for detecting and eliminating narrow-band interference by GNSS receiver
  • Method for detecting and eliminating narrow-band interference by GNSS receiver

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Embodiment Construction

[0033] see Figure 4 , the method for detecting and eliminating narrowband interference by the GNSS receiver of this application is:

[0034] First, the receiver transforms the received time-domain signal into a frequency-domain signal through FFT.

[0035] Secondly, according to the characteristics of the frequency bandwidth and low power spectral density of GNSS satellite signals, and the narrow frequency band and high power spectral density of narrowband interference signals, the receiver finds the frequency point where the power spectral density in the frequency domain signal becomes significantly larger, which is the narrowband The frequency point of the interfering signal. The receiver sets these bands or frequency points as the blocking frequencies of one or more notch filters.

[0036] Finally, the receiver passes the received time-domain signal through the one or more notch filters to filter out narrow-band interference signals. During filtering, the energy of the ...

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Abstract

The application discloses a method for detecting and eliminating narrow-band interference by a GNSS (Global Navigation Satellite System) receiver. The method comprises the steps as follows: firstly, the receiver converts received time-domain signals into frequency-domain signals through FFT (Fast Fourier Transform); secondly, frequency points of narrow-band interference signals are found in the frequency-domain signals and are set as a blocking frequency of a wave trapper; and finally, the receiver filters and eliminates the narrow-band interference signals from the received time-domain signals through the wave trapper. The application has the advantages of simplicity in implementing the technology, smaller calculated amount, high real-time performance and good flexibility.

Description

technical field [0001] The present application relates to a signal processing technology, in particular to a method for detecting and eliminating narrowband interference. Background technique [0002] The GPS system of the United States, the GLONASS system of Russia, the Beidou system of China, the Galileo system of Europe, etc. Each GNSS system includes at least two parts: GNSS satellites and GNSS receivers. The GNSS receiver determines its position on the earth's surface by receiving GNSS satellite signals. [0003] GNSS satellite signals usually use spread spectrum communication (Spread Spectrum Communication, spread spectrum communication), that is, the signal bandwidth used to transmit information is much larger than the minimum bandwidth necessary for the transmitted information. [0004] GNSS receivers will be subject to various electromagnetic interferences when receiving GNSS satellite signals. Common interference sources include wireless communication systems, TV...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21H04B1/71
Inventor 李倩
Owner RDA TECH
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