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Frequency domain and space domain joint anti-interference method aided by probability search

A probabilistic search and frequency domain technology, applied in the anti-jamming field of global navigation satellite systems, can solve problems such as malfunction, low power, system performance degradation, etc., and achieve the effect of improving dynamic performance and stability

Inactive Publication Date: 2014-08-27
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a probability search assisted joint anti-jamming method in the frequency domain and space domain, which solves the problem of coexistence of narrowband interference and broadband interference in the case of interference signals in the prior art, especially that the center frequency of narrowband interference falls within the bandwidth of broadband interference Medium, and the power is lower than the broadband interference, resulting in obvious degradation of system performance or failure to work normally

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  • Frequency domain and space domain joint anti-interference method aided by probability search
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  • Frequency domain and space domain joint anti-interference method aided by probability search

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[0014] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] refer to figure 1 , is the frequency-domain-space-domain joint anti-jamming method assisted by the probability search of the present invention, and relies on three parts of the system, namely the signal preprocessing part, the frequency domain filtering part and the spatial domain filtering part, wherein,

[0016] The structure of the signal preprocessing part is, including multi-channel RF front-end, A / D data collector, each A / D data collector is connected with digital down-converter, low-pass filter and decimator in sequence;

[0017] The structure of the frequency domain filtering part is that it includes two branches, one of which is composed of a window adder, an FFT processing module, a threshold generation and spectral line processing module, an IFFT processing module, and a 50% delay processing module connected in sequence ; T...

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Abstract

The invention discloses a frequency domain and space domain joint anti-interference method aided by probability search. The method includes the first step of signal preprocessing, the second step of frequency domain processing and the third step of space domain processing, wherein in the first step, signals are finally divided into I-path signals and Q-path signals to be output; in the second step, the I-path signals and the Q-path signals finally output in the first step are divided into two branches to be processed, and then the delayed signals and the obtained signals are synthesized through an adder; in the third step, space domain power inversion self-adaptive filtration is performed on the output signals finally synthesized in the second step, broadband interference in the signals is suppressed, and final output signals are obtained. The method solves the problem that when the frequency domain and the space domain are combined to resist interference, narrowband interference is drowned in broadband interference, and the performance of an anti-interference algorithm is reduced or the anti-interference algorithm fails, and the application range of the frequency domain and space domain joint anti-interference algorithm is expanded.

Description

technical field [0001] The invention belongs to the technical field of anti-jamming of global navigation satellite systems, and relates to a joint anti-jamming method of frequency domain and air domain aided by probability search. Background technique [0002] With the maturity of the Global Navigation Satellite System (GNSS) technology, GNSS has shown its incomparable importance in both the military and civilian fields. The research, development and application of GNSS technology are increasingly Many people's attention. However, the signal power of navigation satellites is low, and they are easily affected by various intentional or unintentional interferences. Especially in wartime, they will be suppressed by strong interference and cannot work normally. [0003] In the prior art, in a complex electromagnetic environment where narrowband interference and broadband interference coexist, algorithms such as spatial filtering, space-time joint (STAP), and frequency-domain con...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 席晓莉李敏超刘江凡
Owner XIAN UNIV OF TECH
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