Frequency modulation fuze anti-interference method based on harmonic envelope adaptive weighting

Abstract

The invention relates to a frequency modulation fuze anti-interference method based on harmonic envelope adaptive weighting, and belongs to the technical field of information countermeasure. According to the invention, fast Fourier transform is carried out on the frequency-modulated fuze difference frequency signal to obtain each harmonic coefficient containing target information, the corresponding harmonic position is determined according to the predetermined burst height, and the real target signal is identified by combining the adaptive weighting processing between two adjacent harmonics with the threshold judgment and utilizing the logic characteristics in the missile-target intersection process. And accurate control of the burst point is realized. According to the method, through combined extraction of the harmonic envelope corresponding to the predetermined burst height and the adjacent higher harmonic envelope, the far-to-near rendezvous information contained in the real target echo signal is obtained, and the interference signal which does not meet the logic characteristic can be inhibited; and through multiplication of two paths of harmonic envelopes, the relative correlation sidelobe level is reduced, clutter interference is suppressed, and the target detection precision is improved.

Description

technical field [0001] The invention relates to a frequency modulation fuze anti-interference method based on harmonic envelope adaptive weighting, and belongs to the technical field of information countermeasures. Background technique [0002] The frequency modulation fuze uses the frequency difference between the transmitted signal and the echo signal to determine the distance. Because of its simple algorithm and easy hardware implementation, it has the characteristics of high distance determination and reliable performance compared with the continuous wave Doppler fuze. At present, many countries are equipped with radio fuzes, and in recent years, the equipment is mainly FM fuzes. According to the development of fuzes in various countries, it can be concluded that FM fuzes are still one of the main objects of research and equipment in various countries. [0003] The FM fuze transmits a constant-amplitude continuous wave signal with a frequency change controlled by the mod...

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Problems solved by technology

[0006] The object of the present invention is to provide a kind of FM fuze anti-jamming method based on harmonic envelope self-adaptive weighting, by carrying out fast Fourier transform to the difference frequency signal of FM fuze, obtain each order harmonic coefficient that contains target information, and Determine the corresponding harmonic position according to the predetermined explosion height, through the adaptive weighting processing between two adjacent harmonics combined with the threshold judgment, use the logic characteristics in the process of bomb-eye intersection to reduce the level of related side lobes, identify the real target signal, and realize the explosion Point precise control to solve the problem of insufficient anti-interference ability of FM fuze

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