【摘 要】
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Track circuit shift frequency signal is a kind of continuous phase frequency shift keying signal.It has typical non-stationary signal characte rtstics.The time-frequency analysis methods is introduced
【机 构】
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School of Information Science and Technology,Southwest Jiaotong University,Chengdu,China
论文部分内容阅读
Track circuit shift frequency signal is a kind of continuous phase frequency shift keying signal.It has typical non-stationary signal characte rtstics.The time-frequency analysis methods is introduced to process the non-stationary signal,but two classic Cohens classes and Affmes class time-frequency analyzing methods cannot avoid crossing interference item influence.This paper introduces a kind of method based on the theory of signal rearrangement,to reduce the influence of cross interference item of the two time-frequency method,and improve readability of signal time-frequency domain.Finally,using the computer simulation,the transformation through the rearrangement the two time-frequency analysis methods can provide better time domain and frequency domain resolution,verifying the effectiveness of rearrangement of method.
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