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中文摘要：
甚小线性调频调制作为一种超窄带调制方式,使用升频信号和降频信号分别对应二进制数据＂0＂和＂1＂.根据时频分析理论,证明了甚小线性调频信号是一类小波信号,并采用墨西哥草帽小波对甚小线性调频超窄带信号进行频谱分析比较,还讨论了甚小线性调频信号多周期情况.通过小波分析,从时频分析图中可以直观地看到甚小线性调频信号的频谱随时间的变化,即升频信号的频谱峰能量随码元变化有向高频偏移的趋势,反之,降频信号有向低频偏移的趋势;在多周期甚小线性调频信号中,调制系数越大,频率偏移的趋势则越明显.小波分析精确可靠,为设计特殊滤波器以及系统性能分析提供了基础.
英文摘要：
The very minimum chirp keying（VMCK） is a novel ultra-narrow band communication scheme in which the up-chirp or down-chirp waveform corresponds to one or zero.This paper proves that VMCK is a kind of wavelet signal.The Mexican hat wavelet is used in time-frequency analysis of VMCK communications.Multi-cycle VMCK signal is also discussed.The results show that the spectrums of VMCK signals are arranged in different ways.The spectrum of up-chirp signals shifts to high frequency in the bit symbol,while the down-chirp is in the opposite way.With the multi-cycle VMCK signals,the greater the modulation factor,the more the frequency shifts.The results show reliability of the wavelet analysis.
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