摘要：随着科学技术的飞速发展，铁路由于具有速度快而且又经济实惠的优点，在我国的交通运输系统中扮演着越来越重要的角色，对整个社会的经济发展也起到了很大的推动作用。每天铁路的客流量都很大，在关乎这么多生命和财产的情况下，它的安全问题也就需要得到特别的重视。而在我国常用的就是移频轨道电路，为了保证安全，我们就需要对轨道电路中移频信号的各项参数进行定期的测试。本次课题设计主要是对轨道电路以及移频信号进行了介绍，并分析了国内外的研究现状，对世界上几种常用的移频轨道电路也进行了简单的介绍，最后是通过Matlab中的GUI界面设计进行仿真。由于没办法对移频信号进行实地测试，所以在我的设计中首先要自己利用低频和载频生成移频信号，而现实生活中测到的移频是带有噪声的，所以我要在已生成移频信号的基础上加入高斯白噪声，之后就是对移频信号进行解调，解调采用的方法是先进行滤波，然后把时域内的波形转化到频域来分析，根据频率特性得出移频信号的参数。82307

毕业论文关键词： 移频轨道电路； 滤波； GUI界面设计； 加噪 

Design of frequency -shift parameter test system of track circuit

Abstract：Nowadays, the technology develops rapidly, because of the fast speed and the economic benefits, the railway is playing an increasingly important role in the transportation system of our country, and it plays a very important role in promoting the economic development of the whole society。 Every day the railway traffic is very large, in the case of so many lives and property, its security issues also need to attach great importance to。 And commonly used in our country is frequency shift track circuit, in order to guarantee the safety of track circuit, we need to track circuit frequency-shift signal on a regular basis for the various parameters of the test。 The design of this project is mainly about the track circuit and the frequency shift signal。  This paper analyzes the present situation of domestic and foreign research, then a simple introduction to some of the world's most commonly used frequency-shifted rail circuits。 Finally, the design of GUI interface in Matlab is simulated。 Since there is no way to conduct field tests on the frequency shift signals, I first need to use low frequency and carrier frequency to generate the frequency shift signals in my design, In real life, the frequency shift is noisy, so I'm going to add gaussian white noise on the basis of the generated shift signal。 And then there's the demodulation of the shift signal, The method of demodulation is to do the filtering first, then convert the waveform in the time domain to the frequency domain to analyze the parameters of the frequency shift signal based on the frequency characteristics。 

KeyWords : frequency-shift track circuit; add noise; filter; GUI interface design

目录

1 绪论 1

1。1 课题的目标和意义 1

1。2 国内外研究现状 1

1。2。1国内研究现状 1

1。2。2 国外研究现状 2

1。3 发展趋势 3

1。4 论文主要研究内容 3

2 移频轨道电路 4

2。1 轨道电路的结构组成 4

2。2 轨道电路的工作原理 5

2。3 轨道电路的作用 6

2。4 移频信号的调制