轨道移频信号特征频率提取嵌入式软件设计

发布时间：2018-05-09 14:11

本文选题：轨道移频信号 + 特征频率　；参考：《哈尔滨理工大学》2012年硕士论文

【摘要】：随着我国经济社会的不断发展，我国铁路进入飞速发展的时期，铁路几次的大提速，高铁的投入使用。铁路已经越来越成为人们出行的主要交通工具。但是在铁路发展的同时，如何确保列车的安全运行已经成为一个重要的问题。铁路信号装置是铁路系统的基本装置，同时也担负着确保行车安全的重要责任。现今我国的轨道建设一日千里，行车速度不断加快，对轨道信号的通信与信号的准确显示的要求也越来越高。因此，对指示列车运行的轨道信号的高精度的检测则成为一个重要的课题。本课题是针对我国的轨道移频信号设计的检测系统，它能检测轨道移频信号的特征频率参数，即信号的载频和低频。本系统采用TI公司的OMAPL137作为硬件平台，该芯片是DSP+ARM双架构芯片，它是一款运行速度快，而功耗低的芯片。既可以应用DSP的数字信号处理能力实现信号检测，，应用ARM实现Linux系统的嵌入以及进行各种驱动的设计。OMAPL137芯片的特性符合本设计的要求。Linux操作系统是现在应用比较广泛的CPU操作系统，这个系统的源码都是开放性的，可以在很多处理器上应用，只要根据需求对内核进行剪裁和移植就能够使用。本文主要研究了UM71轨道移频信号的低频信号频率、载频频率检测方法。在对UM71轨道移频信号进行检测时，一个主要的问题就是如何降低采样频率，因为轨道信号符合窄带信号的特征，所以在本设计中采用欠采样方法来实现采样频率的降低，而不使用奈奎斯特的采样方法；同时采用ZFFT的方法进一步提高低频信号的频率分辨率。实现移频信号特征频率的检测。另一方面，基于Linux操作系统设计USB的驱动，LCD的驱动，GPIB接口的驱动，以及对A/D采样芯片ADS1178的驱动。经过设计，本文基本实现了检测系统的主要功能，即对信号特征频率的检测，以及系统软件平台的搭建。
[Abstract]:With the development of our country's economy and society, the railway of our country has entered the period of rapid development, the railway has been speeded up several times, and the high-speed railway has been put into use. Railways have become more and more the main means of transportation for people to travel. But at the same time of railway development, how to ensure the safe operation of trains has become an important issue. Railway signalling device is the basic device of railway system, and also bears the important responsibility of ensuring the safety of driving. Nowadays, with the rapid construction of track in our country, the speed of driving is speeding up, and the requirement of communication and accurate display of track signal is becoming more and more high. Therefore, the high-precision detection of track signals indicating train operation becomes an important subject. This paper is aimed at the design of the track frequency shift signal in China. It can detect the characteristic frequency parameters of the track frequency shift signal, that is, the carrier frequency and the low frequency of the signal. This system uses TI company's OMAPL137 as the hardware platform, this chip is the DSP ARM dual structure chip, it is a fast, but the power consumption low chip. Not only can the digital signal processing ability of DSP be used to realize signal detection, The application of ARM to realize the embedding of Linux system and the design of various drivers. The characteristics of OMAPL137 chip accord with the requirements of this design. LinuxOS is a widely used CPU operating system, and the source code of this system is open. Can be used on many processors, as long as the requirements of the kernel tailoring and porting can be used. This paper mainly studies the low frequency signal frequency and carrier frequency detection method of UM71 track shift signal. In the detection of UM71 track frequency shift signal, one of the main problems is how to reduce the sampling frequency. Because the track signal accords with the characteristics of narrow band signal, the under-sampling method is adopted in this design to reduce the sampling frequency. At the same time, the method of ZFFT is used to improve the frequency resolution of low frequency signal. The detection of the characteristic frequency of the frequency shift signal is realized. On the other hand, the driver of USB is designed based on Linux operating system, the driver of GPIb interface, and the driver of ADS1178, an A / D sampling chip. After the design, the main functions of the detection system are realized, that is, the detection of the signal characteristic frequency, and the construction of the system software platform.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：U284;TP368.1

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