对空无线电引信多普勒信号特征

Revealing Doppler Signal's Feature of Continuous Wave Doppler System Radio Fuze for Air Attack by Means of Short Time Fourier Transform

建立弹目空中交会的数学模型,做些合理的假设,求出理论上的多普勒信号,能从时域或频域提取信号的特征。对于具有非平稳随机特性的实测引信多普勒信号,理论方法和传统的傅立叶变换都无能为力提取其特征。文中用短时傅立叶变换分析实测的引信多普勒信号,讨论分析过程中窗函数的选择,并从联合时频域提取了引信多普勒信号的特征。

It is a theoritical method to set up a mathetical model about missile-target encounter in the air, to make some reasonable hypotheses and to compute Doppler signal, then to reveal its feature of time or frequence domain. But the theoritical method and traditional Fourier transform can't reveal feature of practical signal which is of nonblanced and stochastic. In this paper, choice of window function is discussed and analyzed, and practical signal's feature of joint time and frequence is revealed by means of Short Time Fourier Transform.