基于分数阶域瞬时频率估计的线性调频引信测距性能分析  

Range Performance Based on Fractional Fourier Domain Instantaneous Frequency Estimation for Linear Frequency Modulated Fuze

作　　者：陶艳[1] 郝新红[1] 岳凯[1] 孔志杰[1] 

机构地区：[1]北京理工大学机电工程与控制国家级重点实验室,北京100081

出　　处：《制导与引信》2015年第4期13-19,共7页Guidance & Fuze

摘　　要：研究了基于分数阶域瞬时频率估计的线性调频引信的测距性能:计算线性调频信号的分数阶傅里叶变换,得到分数阶域信号的模糊函数;推导测距精度的定量计算公式,分析测距精度的影响因素,并进行仿真验证。结果表明:观测周期和调制频偏是影响线性调频引信测距性能的关键因素,测距精度随观测周期的增大和调制频偏的增大而提高;并且可以在不提高调制频偏的前提下,合理选择观测周期来改善引信的测距精度。The range performance based on fractional Fourier domain （FRFD） instantane- ous frequency （IF） estimation for Linear-Frequency-Modulated （LFM） radio fuze is studied. The quantitative formula for calculating the range accuracy is deduced by calculating the frac- tional Fourier transform of chirp signal and the ambiguity function of FRFD signal. The main factors affecting the range accuracy are obtained and the simulation verification is car- ried out. The simulation results show that the modulation frequency offset and observation period are the key factors of the range accuracy for LFM fuze system, and the range accuracy can be improved by choosing appropriate observation period, based on the premise of not changing modulation frequency offset.

关 键 词：线性调频 引信 傅里叶变换 测距精度 

分 类 号：TJ439[兵器科学与技术—火炮、自动武器与弹药工程]