基于HHT改进算法的轨道信号解调设计
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摘要
为更好地提高轨道交通信号的可靠性和稳定性,结合轨道交通信号模型提出了一种改进的HHT的信号调节算法。以ZPW2000信号的特点为基础,构建ZPW2000信号的数学模型,以便于改良传统的信号解调只适用于高信噪比场景的弊端,推出一种以HHT为基础的创新算法——采用第一个固有模态函数对轨道信号的上下边频和频率进行解调。多次实验结果显示,新的分析法获得的实际瞬时频率图像同纯轨道信号的瞬时频率图像有很高的重合度,差异落在误差规定的区间内,证明该算法可以在铁路中实际运用。
In order to improve the reliability and stability of rail transit signal,combined with the rail traffic signal model,an improved HHT signal regulation algorithm is proposed.In order to improve the traditional signal demodulation only applicable to high SNR scenarios,this paper constructs the mathematical model of ZPW2000 signal,which based on the characteristics of ZPW2000 signal,so an innovative algorithm based on HHT is proposed.The methid is using the first eigenmode function to tune the lower frequency and frequency of the orbital signal.Been validated by many times experiment,the results showed that the actual instantaneous frequency images obtained by the new analysis method has high coincidence degree with the instantaneous frequency image with pure orbit signal.The difference falls within the margin of error,and it is proved that the algorithm can be used in railway.
In order to improve the reliability and stability of rail transit signal,combined with the rail traffic signal model,an improved HHT signal regulation algorithm is proposed.In order to improve the traditional signal demodulation only applicable to high SNR scenarios,this paper constructs the mathematical model of ZPW2000 signal,which based on the characteristics of ZPW2000 signal,so an innovative algorithm based on HHT is proposed.The methid is using the first eigenmode function to tune the lower frequency and frequency of the orbital signal.Been validated by many times experiment,the results showed that the actual instantaneous frequency images obtained by the new analysis method has high coincidence degree with the instantaneous frequency image with pure orbit signal.The difference falls within the margin of error,and it is proved that the algorithm can be used in railway.
引文
[1]王雪丽.基于TMS320C6720的轨道信号解调方案研究[D].北京:北京交通大学,2017.
[2]杨菲菲.基于TMS320C6722的轨道信号解调方案研究[D].北京:北京交通大学,2018.
[3]苗成伟,陈光武,高建国,等.基于DSP的轨道移频信号解调实现[J].电子科技,2017,(3):47-48,52.
[4]董红生,张爱华,邱天爽,等.分频段Hilbert谱熵的心率变异信号分析方法[J].生物医学工程学杂志,2017,(2):248-254.
[5]王丽萍,苗成伟.Z-FFT变换在站内轨道信号解调中的应用[J].电子科技,2017,(5):35-37.
[2]杨菲菲.基于TMS320C6722的轨道信号解调方案研究[D].北京:北京交通大学,2018.
[3]苗成伟,陈光武,高建国,等.基于DSP的轨道移频信号解调实现[J].电子科技,2017,(3):47-48,52.
[4]董红生,张爱华,邱天爽,等.分频段Hilbert谱熵的心率变异信号分析方法[J].生物医学工程学杂志,2017,(2):248-254.
[5]王丽萍,苗成伟.Z-FFT变换在站内轨道信号解调中的应用[J].电子科技,2017,(5):35-37.