EMD算法在移频信号解调中的应用研究

随着我国列车运行速度的不断提高,对列车运行自动控制系统的可靠性和安全性提出越来越高的要求.现存的算法大多考虑纯净的或SNR较高的移频信号.为了实现在强噪声背景下移频信号的可靠、准确解调,本文提出了一种基于EMD分解算法的移频信号解调方法,并进行了计算机仿真.仿真结果表明,用EMD分解算法能够从强噪声背景下分解出移频信号,结合FFT变换,可以实现移频信号的解调.与现存的算法比较,本文的算法简单,可实时性好.

Study on Frequency-shift Signal Demodulation Using EMD Algorithm

With the velocity of cab increasingly rising, the higher and higher demands on reliability and security of the cab automatic control system are proposed. The existing methods usually take into account the frequencyshift signal which is free-noise or is contaminated by the faint noise with high SNR. In order to realize the reliable, accurate demodulation of frequency-shift signal in the strong background noise, a frequency-shift signal demodulation method based on EMD algorithm is proposed and the numerical computer simulation is carried out to illustrate the validity and feasibility of our algorithm in this paper. The result of the computer simulation shows that frequency-shift signal can be demodulated accurately by using the EMD algorithm and combining with FFT. Compared with the existing methods, our method has good properties of simply calculating and high real-time processing.