Frequency domain anti-interference method and device based on adaptive threshold judgment

Abstract

The invention discloses a frequency domain anti-interference method and device based on adaptive threshold judgment. The frequency domain anti-interference method and device based on adaptive threshold judgment are used for solving the technical problem that an existing frequency domain anti-interference method is poor in real-time performance. According to the technical scheme, a threshold is worked out through real-time data and directly acts on the current data, and overlap processing and windowing operation are adopted in the processing process to solve the problem that the signal-to-noise ratio is low. In the method, the real-time data are adopted for working out the threshold, the mean value is worked out after major vertexes are removed to serve as the threshold, the threshold acts on the current data for achieving interference suppression, and therefore the accuracy and the real-time performance of the threshold are achieved; pipeline design is completely achieved in practical application, any feedback is not needed, and the problem that interference fringes can not be completely suppressed is solved; in addition, the interference suppression adaptive ability is completely achieved due to the processing real-time performance, and effective working can be achieved under the high dynamic environment and the fast interference transformation environment.

Description

Technical field [0001] The invention relates to a frequency domain anti-interference method, in particular to a frequency domain anti-interference method based on adaptive threshold decision. It also relates to a device for implementing the frequency domain anti-interference method based on adaptive threshold decision. Background technique [0002] The power of the satellite signal in the satellite navigation system is very low (even lower than -133dBm), and it is susceptible to various forms of intentional or unintentional interference, which leads to the degradation of the navigation and positioning performance of the user machine, and even the normal operation. Therefore, the development of satellite navigation receivers with anti-jamming capabilities has become an important issue that needs to be resolved urgently. [0003] Currently, filtering narrowband interference or multi-tone interference in the effective bandwidth of satellite signals usually includes the following two ...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the disadvantage of poor real-time performance of existing frequency domain anti-jamming methods, the present invention provides a frequency domain anti-jamming method based on adaptive threshold judgment

The method uses real-time data to obtain the threshold, and directly applies the threshold to the current data. The processing process adopts overlapping processing and windowing operations to solve the problem of low signal-to-noise ratio; the present invention uses real-time data to obtain the threshold, and then obtains The average value is used as the threshold, and the threshold is applied to the current data for interference suppression, thereby realizing the accuracy of the threshold and the real-time performance of the threshold. In practical applications, the pipeline design is completely realized without any feedback, and the problem that the interference edge cannot be completely suppressed is solved. , and the real-time processing fully realizes the adaptive ability of interference suppression, and can work effectively in the environment of high dynamics and rapid interference changes

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