摘要
轨道电路是轨道信号的载体,是行车安全的可靠保障。铁路上通常采用测试轨道信号参数的方法来衡量轨道电路工作状态的好坏,并且对测试方法的实时性和准确性都有严格的要求。本文提出了一种轨道信号参数实时测试的新方法。轨道信号由机车底盘下面的感应器感应上来,经过隔离、滤波和放大,送至数字采集卡进行A/D采样;采样后的离散样本经FFT变换后,先进行频谱细化,再进行频谱校正处理;最后,根据频谱分布的对称性,得到信号的幅度和频率参数。系统的硬件结构和软件实现均采用了虚拟仪器技术。现场实验表明,该分析仪测试精度高,实时性好,满足所有的测试要求。
Track circuit plays an important role in automatic train control system. It can be examined by testing the railway signal parameters according to certain testing requirements. In this paper, a new test method was put forward so as to acquire the FSK modulated railway signal parameters in real time. Railway signal samples were firstly transferred by FFT, then zoomed and corrected in frequency domain. Lastly, Signal parameters were obtained according to the symmetry of FSK modulated signal. During the system implementation and software realization, the virtual instrumentation techniques were adopted. Trial test shows that the analyzer is efficient and easy to use and all the requirements are satisfied.
出处
《电子测量技术》
2007年第2期84-86,113,共4页
Electronic Measurement Technology
关键词
虚拟仪器
频谱校正
轨道信号
virtual instrumentation
spectrum correction
railway signal
