Method and device for inhibiting narrowband interference

Abstract

The invention discloses a method and device for inhibiting narrowband interference. The method comprises steps of performing delay processing on an intermediate frequency signal in a satellite navigation positioning system to obtain initial signals of at least four paths which have different percentage clock delays, performing interference inhibition processing on the initial signal of each path to obtain a processing signal which is in one-to-one correspondence with the initial signal of each path, wherein a maximum sidelobe of a preset window function adopted in the interference inhibition processing is lower than a maximum sidelobe of a Blackman window function, and performing superposition processing on the processing signal of each path to obtain an output signal. Because the method adopts the preset window function during the interference inhibition processing, wherein the maximum sidelobe of the preset window function is lower than the maximum sidelobe of the Blackman window function, the method has a good effect of inhibiting the narrowband interference. Furthermore, the method adopts a measure that the signals of at least four paths are processed synchronically, so that dramatic decrease of satellite positioning system performance due to comparatively great loss of the signal to noise ratio of the output signal is avoided.

Description

technical field [0001] The present invention relates to the field of anti-interference technology, and more specifically, relates to a method and device for suppressing narrow-band interference. Background technique [0002] Satellite navigation and positioning systems are widely used in various fields of life. Satellite navigation and positioning systems use spread spectrum communication technology, which can suppress interference signals of a certain strength in the environment. , the performance of the entire system will drop sharply. [0003] The mainstream narrowband interference suppression technology in the prior art is the transform domain anti-jamming technology. Its main idea is to use the characteristics of the effective signal and the narrowband interference signal to be very different in different transform domains, and use this feature to detect the narrowband interference signal. In this way, the attenuation or zeroing of the spectrum amplitude is performed o...

AI Technical Summary

Problems solved by technology

However, the main disadvantage of this technology is that the maximum sidelobe of the applied window function is relatively high. Even the Blackman window function with a lower maximum sidelobe is only -57dB, and the suppression effect on interference signals is poor. However, limited by the processing flow of this method, if a window function with a lower maximum side lobe is used, it will bring a large loss of signal-to-noise ratio, which will lead to a sharp decline in the performance of the satellite navigation and positioning system.

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