The Railway Track Inspection Technology Based On Fpga

Since it is a regular job for railway workers to measure the railway track's static geometry parameters. Inspecting instrument for static geometry parameters of track does benefit them by greatly reducing the work. Along with the vigorous growth of Chinese railway construction recent years, the inspecting instrument is required to be advanced. The paper, referring the precious experiences from overseas advanced measuring technology, develops a new design program. The program uses Field Programmable Gate Array (FPGA) as the key technique, and adopts embedded intellectual system. The system takes full use of the FPGA chip programmable design characteristics, with a hardware portion design by software thinking way, and has a modular hardware system constructed by the software named SOPC Builder. The system can meet the requirements on automatic and intelligent detection. The paper includes three parts:Firstly, this paper introduces the background of the research of inspecting instrument of track, by investigating the current situation of track measuring equipment, and analyzing its advantages and disadvantages. The introduction points to the direction of the paper. In this part, the general introduction to the intellectual system and embedded system is also provided. It clear states the purpose and main content of the paper.Secondly, the paper states an overall design on the track measuring system. The system selects proper sensors and other external components, in accordance with the requirements on measuring those three stratic geometry parameters. Nios II soft processor is adopted in this system. The paper makes detail explanation on the design from both software and hardware perspective. The hardware design includes CPU and peripheral controller module, analog signal regulate circuit, data acquisition circuit, encoders digital interface circuit, sensor circuit, man-machine interface circuit and other auxiliary circuit, etc.; while software system design is divided into start layer program, driving layer and the application layer design. Finally, the paper operates simulation on the newly designed system. The result suggests that the system can well meet the requirements of the three parameters (namely, mileage, track width, superelevation) testing standard.