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摘要：铁路运输在中国是一种非常重要的运输方式，它对于调节社会经济水平的高低起着特别重要的作用。所以，增强铁路的运输能力和保障火车行驶安全是非常重要的。轨道电路是一种基础设备，可以控制列车行驶、保证行车安全型，而且必须对轨道电路的工作状态进行定期的检查来保障其可靠性，因为它的安全直接影响铁路的列车行驶安全。
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移频轨道电路是一个目前在我国普遍使用的轨道电路的主要形式。目前，我国移频轨道电路包含国产18信息、移频自动闭塞系统和来自法国的但是被国产化的ZPW-Z000A无绝缘移频自动闭塞系统两种制式，且全部以频率作为参数来传递行车信息。本论文课题的研究对象为ZPW-2000A，通过对这个系统的移频轨道电路信号的频谱特点进行分析后，提出了以FFT算法为基础的提取特征频率的新方法， 利用MATLAB仿真软件，对所提出的轨道移频信号检测与提取方法进行了大量的仿真验证。36428
毕业论文关键词： 轨道电路；移频信号；FFT；MATLAB仿真
Characteristic frequency track circuit analysis system design
Abstract：Railway transport is a very important mode of transportation in our country, which is playing an extremely important role in the development of social economy. Therefore, it is very important to strengthen the railway transport capacity and ensure the safety of train running .Track circuit as the basis equipment to control train’ safety running, its reliability directly affect the safety of railway, therefore the working state of the track circuit must be regular inspected.
Track circuit frequency shift is a major form currently in widespread use of the track circuit.At present, China's shift frequency track circuit comprising 18 domestic information, frequency shift automatic blocking system and from France but is localization ZPW-Z000A Uninsulated Frequency Shift Automatic Block System in both formats, and all the frequency as a parameter to pass traffic information. This thesis topic use ZPW-2000A system as the main research object. Through to the frequency shift signal spectrum characteristics analysis, put forward on the basis of the FFT algorithm to extract the characteristic frequency of the new method of using MATLAB simulation software, the proposed track frequency shift signal detection and extraction methods are a large number of simulation. Using MATLAB simulation software, the proposed track frequency shift signal detection method for a large amount of simulation test and verify.
Keywords: track circuit; frequency-shift signaling; FFT; MATLAB Simulation
目录
1 绪论 1
1.1 课题研究目的和意义 1
1.2 国内外研究水平 1
1.3 轨道移频信号特征频率提取的研究现状 2
1.4 本课题研究内容 3
2 ZPW-2000A系统介绍 4
2.1 ZPW-2000A系统组成 4
2.2 轨道电路组成与原理 5
2.2.1轨道电路组成 5
2.2.2轨道电路工作原理 6
2.3 移频轨道电路工作原理 7
3移频信号的介绍 11
3.1 移频信号介绍 11
3.2 轨道移频信号的特点 13
3.2.1时域特点 13
3.2.2频域特点 13
3.3铁路 FSK 信号的调制原理 13
4移频轨道电路特征频率提取的算法研究 15
4.1 HHT 算法原理介绍 15
4.2 FFT算法原理介绍 18
4.3 MATLAB中FFT的实现 20
5 MATLAB简介 21
5.1 MATLAB系统介绍 21
5.2 MATLAB中利用GUIDE创建GUI 22