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Research of Technology for Sampling and Process on Train Track Signal

Author: QiaoZhiFeng
Tutor: SunFeng
School: Harbin Engineering University
Course: Measuring Technology and Instruments
Keywords: DSP Frequency shift signal CAN bus ZFFT Subsampling
CLC: U284
Type: Master's thesis
Year: 2007
Downloads: 214
Quote: 3
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Abstract


With the era of the development of rail transport is an increasingly prominent role in the national product, as well as the lives of the people , the safe operation of the railway traffic has become an important research topic . In this paper, research plays an important role in the operation of railway automation track signal acquisition and processing problems . Track signal system used in China , there are two main domestic 18 the frequency shift and UM71 standard . They are frequency shift keying (FSK) signal , a different carrier frequency and low-frequency signal . This paper design a hardware and software to track signal acquisition system with the new train control device . The article first introduces the knowledge of the locomotives and track signals . Acquisition system hardware design using TI's TMS320VC5416 main processing chip logic controller chip used Altera's EMP7128s chip communication using the CAN bus , the main control chip uses the Philips SJA1000 chip . Software , first the track signal of the two standard analysis , the main analysis respective different spectral characteristics . On this basis , the signal recognition algorithm . Determined by counting two standard carrier frequency detection ; using under-sampling signal of the low-frequency information , ZFFT method using MATLAB simulation algorithm . Finally , in the CCS environment programming system .

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CLC: > Transportation > Rail transport > Railway communication,signal > Railway signal
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