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GNSS interference feature identification method and system based on time-spectral value smoothing and segmentation

An identification method and spectrum value technology, applied in the field of GNSS interference signal identification, can solve the problems of slow post-correlation interference detection, poor characteristic parameter estimation, inability to interfere with signal cycle characteristics, and key parameter estimation of frequency change characteristics.

Active Publication Date: 2020-10-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Compared with the two schemes, post-correlation interference detection is slower and less sensitive to interference signals, while pre-correlation interference detection is faster and more sensitive to interference
[0004] In addition, most of the above-mentioned interference detection methods can only detect the existence of interference, and cannot estimate the key parameters such as the periodic characteristics and frequency variation characteristics of the interference signal, so they cannot identify the interference characteristics
Considering the time-frequency analysis method, the parameters of the interference signal can be estimated while detecting the existence of the interference signal. However, the traditional time-frequency analysis only has a good estimation effect on the parameters of the high-power interference signal. , especially the characteristic parameter estimation effect of broadband low-power interference signal is not good

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  • GNSS interference feature identification method and system based on time-spectral value smoothing and segmentation

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Embodiment Construction

[0031] A GNSS interference feature identification system is disclosed in the embodiment, which mainly includes: an input GNSS intermediate frequency signal, a joint time-frequency domain analysis module, a comprehensive numerical processing module, a multi-channel block numerical processing module, a period extraction module, and an edge integrity judgment module, data smoothing module, spectral value frequency band segmentation module and data reorganization module. Among them, the comprehensive numerical processing module and the multi-channel block numerical processing module have the same internal structure, and are composed of a normalization module, a filter and a binarized data segmentation module; the period extraction module includes a gradient extraction module and a period estimator; The frequency band division module has multiple output terminals, and the array reorganization module has multiple input terminals.

[0032] The GNSS intermediate frequency signal is in...

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Abstract

The invention provides a method and a system for identifying an interference feature of GNSS based on smoothing and segmentation of a time-frequency spectrum value. The method comprises: combining a feature of a GNSS signal to optimize a classical time-frequency method; performing smoothing of the time-frequency spectrum value; and performing segmentation of the spectrum value according to a frequency band energy distribution condition. According to the method and the system for identifying the interference feature of the GNSS based on the smoothing and the segmentation of the time-frequency spectrum value, identifying capability of the interference feature of the signal with small-power of a broadband can be improved, identifying effect of the interference feature of the signal can be improved, and a necessary condition is provided for suppression of subsequent interference.

Description

technical field [0001] The invention belongs to the field of GNSS interference signal identification, in particular to a GNSS interference feature identification method based on time-spectrum value smoothing and segmentation. Background technique [0002] With the rapid development of economy and technology, Global Navigation Satellite System (GNSS) has gradually become an important infrastructure for providing location-based services in today's society. However, its reliability is threatened by many factors. After a long-distance transmission, the signal power of the satellite signal is very low when it reaches the ground, and it is easily affected by various unintentional or intentional radio interference signals. Suppressive interference signals are one of the worst types of GNSS interference. Interference signals affect the tracking performance of satellite signals, resulting in increased pseudo-range errors and positioning errors, which seriously reduce the reliability ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 丁梦羽许睿刘建业曾庆化孟骞熊智
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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