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Air frequency anti-interference method in satellite navigation application system and application system

An application system and satellite navigation technology, applied in the field of satellite navigation, can solve the problem of anti-multi-narrowband interference that cannot be filtered out, and achieve a strong practical effect

Active Publication Date: 2018-04-13
BEIJING SATELLITE INFORMATION ENG RES INST
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an anti-jamming method for space frequency in a satellite navigation application system that can effectively eliminate the problem that anti-multi-narrowband interference cannot be filtered out

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  • Air frequency anti-interference method in satellite navigation application system and application system
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  • Air frequency anti-interference method in satellite navigation application system and application system

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Embodiment Construction

[0039] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0040] like figure 1As shown, the block diagram of the existing space-frequency anti-jamming algorithm is given. The space-frequency anti-jamming algorithm is processed after the RF front end. The signal received by the array antenna outputs an intermediate frequency analog signal through the RF module, and the digital signal is obtained through AD sampling, and then the Anti-jamming algorithm processing, anti-jamming processing. It mainly includes six steps: sampling / buffering, windowing processing, DFT, anti-jamming filtering processing at each frequency point, IDFT, and inverse windowing processing, but there is no narrow-band filtering step between anti-jamming filtering processing at each frequency point and IDFT.

[0041] like figure 2 As shown, the present invention designs a space-frequency anti-jamming method...

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Abstract

The invention relates to an air frequency anti-interference method in a satellite navigation application system and an application system. Through adding a narrowband filter module after each frequency point anti-interference filter processing module and before an inverse Fourier transform module, the problem that anti-multi-narrow band interference can not be filtered existing in the current airfrequency anti-interference algorithm can be solved. The whole process can be realized through integrating in an FPGA, and miniaturization design of the device is facilitated; and the method is applicable to satellite navigation equipment in military fields such as missiles, bombs, aircraft, and ships and has a strong practicability.

Description

technical field [0001] The invention relates to a space frequency anti-jamming method in a satellite navigation application system and an application system, belonging to the technical field of satellite navigation. Background technique [0002] Satellite technology plays an increasingly important role in modern life, but due to the extremely weak satellite navigation signal (-130dBm), the equipment is very vulnerable to various natural or man-made interferences and cannot work. Therefore, it is necessary to introduce array antenna anti-interference technology To improve the anti-jamming ability of the satellite navigation system. [0003] There are narrow-band, broadband, frequency-sweeping, and pulse signals in the types of interference, and there are single-interference and multi-interference forms in the number of interferences. In order to improve the performance of anti-broadband interference and multi-interference, the space-time / frequency domain joint method is gener...

Claims

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Application Information

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IPC IPC(8): G01S19/21G01S19/37
CPCG01S19/21G01S19/37
Inventor 徐振兴刘鹏陈耀辉魏婵娟王宏伟车欢
Owner BEIJING SATELLITE INFORMATION ENG RES INST