基于DSP的轨道电路移频信号测试仪设计

Design of Track Circuit Frequency-shift Signal Tester Based on DSP

随着铁路技术的快速发展和列车运行速度的不断提高,准确快速地检测列车自动控制系统中轨道电路移频信号参数成为了列车安全运行的重要保证。针对现有轨道电路移频信号检测算法在检测精度和检测时间上的局限以及传统移频信号测试仪智能化的不足,采用了基于FFT的汉宁窗频谱重心校正算法,以DSP为核心进行了轨道电路移频信号测试仪的软硬件设计,并进行了测试实验,实验结果表明,该测试仪能够快速准确的自动检测出移频信号的各项主要参数。

With the rapid development of railway technology and the constant improvement of train running speed,accurately and quickly detecting the track circuit frequency-shift signal parameters in train automatic control system becomes the important guarantee of train safe running.Aiming at the limitations on detection precision and times of current track circuit frequency-shift sig-nal detection algorithms and the shortcomings on intelligence of traditional frequency-shift signal testers,the Hanning window spec-trum orthocenter correction algorithm based on FFT was used.With DSP as the core of the software and hardware design of track circuit frequency-shift signal tester,the test experiments were carried out.The test results show that the mainly parameters of fre-quency-shift signal can be automatically demodulated quickly and accurately by the tester.