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Research on Frequency-shift Signal Generator of Railway Base on μC/OS-Ⅱ

Author: LvHeSheng
Tutor: ZhangJing
School: Chongqing University of Technology
Course: Signal and Information Processing
Keywords: Hair transcoder Embedded μC/OS- Ⅱ DDS FPGA
CLC: U284
Type: Master's thesis
Year: 2011
Downloads: 18
Quote: 0
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Abstract


As an important part of the system of trains, train signal equipment running smoothly or not directly related to the the train operating efficiency and traffic safety. Along with the smooth implementation of China's railway sixth large-scale speed, stability and reliability of train signal equipment facing higher requirements. Train signal equipment out of storage testing and computer monitoring system debugging is very necessary and important work. With the development of science and technology, the new theory of how to use new technology to solve problems encountered in the railway system, to better serve the cause of China's railway has greater practical significance. Debugging needs of the the domestic locomotive signal detection and computer monitoring system, combined with the existing issued transcoder complex operation, single function, the shortcomings of equipment on-site detection and computer monitoring system debugging is not easy, based on the embedded system design ideas and DDS (Direct Digital Synthesizing) technology, proposed a network embedded hair codec developed. This article consists of the following five elements: (1) in-depth analysis of the characteristics of our existing track circuit, combined with railway signal equipment on-site detection and system debugging need to study and clear the railway signal sent transcoder functionality and technical indicators. (2) under the direct digital synthesis theory, the text on the the DDS synthesis of signal from both the time domain and frequency domain analysis and synthesis of the theoretical value of the signal-to-noise of DDS. FPGA (Field-Programmable Gate Array) platform, based on DDS technology to achieve high-precision FSK (Frequency-shift keying) signal output. The modular design approach allows flexible design, different frequency FSK signal output by changing the value of the DDS frequency control word, the system has reached the general requirements. (3) Considering the signal device testing and system debugging requirements, system stability and reliability of the introduction of the railway signal failure - security design principles. Two takes two logic control system the internal two sets of closed-loop detection circuit to take, to ensure the reliability and consistency of the system to send a signal through the closed-loop detection of the transmitted signal, the automatic detection of system failures. (4) In order to improve the efficiency of the system and enhance the centralized management of the testing equipment, put forward the packet transmission and remote control method based on CAN bus system hardware and software co-design, take advantage of the modular design concept. This design can effectively shorten the design cycle of the system, and will also greatly enhance the stability of the system. (5) transplantation based on ARM7 μC/OS- Ⅱ system to determine the multitasking design μC/OS- Ⅱ system based. By μC/OS- Ⅱ multi-task scheduling, and ultimately the real-time transmission of high-precision frequency-shift signal. Hair transcoder room temperature, low temperature, high temperature experimental test, and then verify the present of hair design code-based embedded system design thinking, job stability, real-time and secure, reliable, with high accuracy sent the vast majority of standard FSK signal China's railway has a strong versatility, fully meet the demand of the train signal detection equipment and computer monitoring system debugging.

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