本文選題：軌道移頻信號 + 特征頻率�。� 參考：《哈爾濱理工大學(xué)》2012年碩士論文

【摘要】：隨著我國經(jīng)濟社會的不斷發(fā)展，我國鐵路進入飛速發(fā)展的時期，鐵路幾次的大提速，高鐵的投入使用。鐵路已經(jīng)越來越成為人們出行的主要交通工具。但是在鐵路發(fā)展的同時，如何確保列車的安全運行已經(jīng)成為一個重要的問題。鐵路信號裝置是鐵路系統(tǒng)的基本裝置，同時也擔(dān)負著確保行車安全的重要責(zé)任。現(xiàn)今我國的軌道建設(shè)一日千里，行車速度不斷加快，對軌道信號的通信與信號的準(zhǔn)確顯示的要求也越來越高。因此，對指示列車運行的軌道信號的高精度的檢測則成為一個重要的課題。 本課題是針對我國的軌道移頻信號設(shè)計的檢測系統(tǒng)，它能檢測軌道移頻信號的特征頻率參數(shù)，即信號的載頻和低頻。本系統(tǒng)采用TI公司的OMAPL137作為硬件平臺，該芯片是DSP+ARM雙架構(gòu)芯片，它是一款運行速度快，而功耗低的芯片。既可以應(yīng)用DSP的數(shù)字信號處理能力實現(xiàn)信號檢測，，應(yīng)用ARM實現(xiàn)Linux系統(tǒng)的嵌入以及進行各種驅(qū)動的設(shè)計。OMAPL137芯片的特性符合本設(shè)計的要求。Linux操作系統(tǒng)是現(xiàn)在應(yīng)用比較廣泛的CPU操作系統(tǒng)，這個系統(tǒng)的源碼都是開放性的，可以在很多處理器上應(yīng)用，只要根據(jù)需求對內(nèi)核進行剪裁和移植就能夠使用。本文主要研究了UM71軌道移頻信號的低頻信號頻率、載頻頻率檢測方法。在對UM71軌道移頻信號進行檢測時，一個主要的問題就是如何降低采樣頻率，因為軌道信號符合窄帶信號的特征，所以在本設(shè)計中采用欠采樣方法來實現(xiàn)采樣頻率的降低，而不使用奈奎斯特的采樣方法；同時采用ZFFT的方法進一步提高低頻信號的頻率分辨率。實現(xiàn)移頻信號特征頻率的檢測。另一方面，基于Linux操作系統(tǒng)設(shè)計USB的驅(qū)動，LCD的驅(qū)動，GPIB接口的驅(qū)動，以及對A/D采樣芯片ADS1178的驅(qū)動。經(jīng)過設(shè)計，本文基本實現(xiàn)了檢測系統(tǒng)的主要功能，即對信號特征頻率的檢測，以及系統(tǒng)軟件平臺的搭建。
[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.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：U284;TP368.1

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本文編號：1866329