The Hardware Design Of Catenary Fixed Piont Monitoring System

With the rapid development of railway system and train speed unceasing enhancement, the safety awareness and demand of driving are gradually improved. The overhead catenary is an important part of the railway system, and its fault rate is high as to the working environment. If an overhead contact line breaks down, the involved railway lines will be greatly affected. According to the problem, an idea for the designing a device for early warning the fault of overhead catenary,which is based on image processing technology, has been proposed in this paper.At the same time,the design of the hardware of the device has been analyzed detailedly.The main task of this project is to propose the overall design scheme of the fault early warning device, and design the related hardware platform for it. The main monitoring objects including:catenary wrist arm lists, contact the tension, and made stem and contact wire site status, and the meteorological information along the railway. So the whole design scheme is mainly based on digital signal processor, Analog-to-Digital converter, the infrared camera, temperature sensors, wind sensors, tension sensor and wireless microcontroller and other chips to monitor the meteorological information and to acquire the image of contact lines and the pillars so as to monitor the catenary. Sensors are used to collect the data of temperature, tensile force, angle of inclination, wind direction and wind speed, etc. When some data reach or even exceed the setting value, the infrared camera will be launched and acquire an image automaticly.After processing and contrasting the images, the device could get the similarity of two images. If the similarity is lower than the setting value, warning messages will be sent through the communication module. The aim of the early warning device is to monitor the catenary, especially to monitor the potential fault exist or not of the contact lines and pillars or even broke down, so as to improve the safety of driving.According to the function of early warning device to carry out the design, and this design project focuses on data collection and image processing module. And the starting point of the paper is to design the hardware of failure warning device in catenaries. TMS320DM642 chip is the core processor for the design, and based on the minimum system, the peripheral circuit has been designed according to the chips such as AM29LV320, MT48LC4M32B, SAA7113H, AD7656, and TL16752B and so on. According to the modular idea, the principle and specific functions of each module have been analyzed. Each part has been analyzed seriously in this paper according to the sequence of selecting devices, analyzing the principle, designing the whole circuit and debugging the hardware.Both of the principle diagram and PCB are designed in the paper. At the same time, the related theories of the signal integrity and the HyperLynx simulation tools have been introduced briefly. At the end of this thesis, integrated development environment CCS and the development process of DSP have been analyzed, and the methods of debugging also have been analyzed.