Signal anti-interference processing method of GNSS navigation satellite

Abstract

The invention discloses a signal anti-interference processing method of a GNSS navigation satellite. The method is used for improving the anti-interference capability of a satellite navigation signalreceiving system, according to the technical scheme, the GNSS navigation satellite radio frequency signal is converted into a digital intermediate frequency sampling signal through a module/ digifax processing chip, the digital intermediate frequency sampling signal is sent to a signal and data processing module, the obtained I, Q sampling data flow which is subjected to digital down-conversion processing is subjected to data caching and extraction control, the product of the extracted I, Q sampling data and conjugate transposition of the I, Q sampling data is solved and carried out statistical averaging, and a self-correlation matrix is obtained; according to the power inversion criterion, the optimal weight coefficient of the digital wave beamforming is calculated; the I, Q data which issubjected to DBF synthetic processing is obtained; and finally, the digital intermediate-frequency signal which is subjected to the DBF synthetic processing is inputted in the module/ digifax processing chip for analog up-conversion processing, an anti-interference processed GNSS radio frequency signal is obtained and is sent to a receiver to carry out navigation positioning.

Description

technical field [0001] The invention relates to the field of signal processing and navigation, in particular to a satellite navigation anti-jamming signal processing technology in the civilian field. Background technique [0002] The Global Navigation Satellite System (GNSS) is about 20,000 kilometers away from the earth, and the signal power reaching the earth is very small, which makes the satellite navigation signal receiving system vulnerable to interference. In the civilian field, with the continuous increase of various communication systems and wireless data transmission systems, the electromagnetic environment is becoming more and more complex. Although these systems themselves may not be in the GNSS frequency band, the intermodulation products and out-of-band transmission of signals may affect GNSS. The reception of the signal causes interference, resulting in reduced navigation accuracy or complete loss of lock of the receiver. [0003] At present, the anti-jamming...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to improve the anti-jamming capability of the satellite navigation signal receiving system in a complex electromagnetic environment. For this reason, the present invention proposes a navigation satellite signal anti-jamming method based on adaptive array signal processing

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