LFM Interference Excision Technique in Pseudo-random Code Fuse Based on Fractional Fourier Transform
Shuning Zhang · Acta Armamentarii · 2006
The influence of LFM interference on correlation detection performances of the pseudo-random code fuse was analyzed.It is found that the correlation output is deteriorated when the LFM interference power exceeds the anti-jamming limitation of the fuse itself.Thus,the LFM interference must be excised before correlation.By analyzing the fractional Fourier transform(FRFT) result of LFM signal,a method of excising LFM interference in fractal domain was put forward.To avoid the disadvantage of useful signal loss with the fixed threshold when strong interference exists,a method of adaptive threshold was proposed.Simulation results show that it can excise the LFM interference effectively,ameliorate the correlation output and improve signal to jamming ratio.