基于RLS的列控音频检测方法研究

摘要

Automatic Train Control (ATC)is the guarantee of train operation safety,and audio signal is an important source of ground information for ATC.For reliable detection of ATC audio information,in the paper we introduce the characteristics of railway ATC frequency shift signals,and propose a new RLS technology-based method for ATC audio detection.The method first detects ATC audio ’s carrier frequency signal size,and then takes a certain edge frequency of ATC audio for the expected reference input of RLS filter.Through MATLAB software the method is verified,the results show that this method can effectively filter out the corresponding edge frequency,and can calculate low frequency envelope signal through low pass filtering.In end of the paper,the algorithm is employed to detect real ATC audio signals,and the measurement result is consistent with the actual ones,so the algorithm is effective and has certain applied value.%列控系统是列车运行安全的保证，而音频信号又是列控系统的地面重要信息来源。为了对列控音频信息可靠检测，介绍铁路列控系统移频信号的特点，提出一种基于递推最小二乘（RLS ）技术的列控音频检测新方法。该方法首先检测列控音频的载频信号大小，然后取列控音频的某一边频为RLS滤波器的期望参考输入。通过MATLAB软件进行验证，结果表明，该方法能有效地滤除相应边频，可以通过低通滤波求取低频包络信号。最后，利用该算法对真实的列控音频信号进行检测，测量结果与实际相符合，因此该算法是有效的，具有一定的应用价值。