摘要
分析线性调频(LFM)干扰对伪码体制引信相关检测性能的影响,结果表明当LFM干扰超出伪码体制引信自身抗干扰容限时,相关输出严重恶化,因此必须在相关检测前对LFM干扰进行抑制。通过对LFM干扰信号分数阶傅立叶变换计算结果的分析,提出在分数阶域进行LFM干扰抑制的方法;为避免固定门限方法在强干扰情况下造成有用信号的损失,提出了自适应门限的干扰抑制方法。通过仿真分析发现该方法能够有效消除LFM干扰,相关输出曲线明显改善,信干比得到显著提高。
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.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2006年第1期32-36,共5页
Acta Armamentarii
基金
国防"十五"重点预先研究项目(413050305)
