时频分析方法提取对空近炸引信多普勒信号频率信息特征

Abstracting of the Message Feature of Frequency of Doppler Signal Received by Radio Proximity Fuze for Air-attack by Using Time-frequency Analysis Method

随着数字信号处理技术的发展和高性能数字信号处理器件的出现 ,使得利用时频分析方法实时提取信号的时变频率信息成为可能。在表征信号频率的时变性能方面 ,对目前广泛使用的数字计数测频方法和新提出的时频分析估计频率方法作了具体的分析和比较。最后通过仿真 ,验证了在弹目交会的短暂过程中连续波多普勒体制对空无线电近炸引信回波信号多普勒频率随时间的变化规律。

With the development of DSP technology and the advent of superior DSP, it is possible to abstract real time time Varing frequency of the signal. In this paper, two calculating frequency methods respectively by enumerating and time frequency analysis are analyzed and compared with each other in aspect of indicating time varing feature of signal's frequency. At last, the feature of Doppler frequency of signal received by the radio proximity fuze for air attack during projectile target engagement is demonstrated through simulation.