The Design Of Train Track Signal Processing System Based On OMAP-L138Application Processor

Over the past decade, the ZPW-2000A Jointless Track Circuit Frequency-shift Automatic Block System which was independently developed by China has been fully operated, and ZPW-2000has become the main track signal system, making a great contribution to the security and stability of railway signaling system of our country together with the JT1-CZ2000Cab Signal vehicle system. With the STM320VC33DSP chips in JT1-CZ2000Cab Signal vehicle system gradually draw from the market, it is particularly important to select a new DSP chip to develop a faster, safer and more stable vehicle system.The rapidly developing DSP applications technology provides a very advanced condition for the new generation locomotive vehicle equipment development, so does the information storage technology for the improvement of the signal for locomotive records. After fully studying the DSP chip’s processing speed and efficiency of data transmission and some other important technical indicators, this paper proposes and implementes a vehicle system scheme based on TI’s OMAP seriesdual-core floating-point processor.In this paper, we design a new high-speed and real time signal processing system which takes the TI’s OMAP-L138dual-core processor as the core. The physical structure of the system consists of two boards achieving the link between expansion board and core board by DIMM linker. The core board is composed of OMAP-L138minimum system and expansion board integrates all functions peripherals. This design style improves the flexibility and scalability of the system. In hardware design, useing OMAP-L138’s external expansion memory interface (EMIFA) as a peripheral expansion channel and mainly achieves the parallel connection of the DDS, A/D, D/A and other circuit chip. In addition, the system also extends the LCD, Audio, SD card, USB, EMac, SATA and other peripheral circuits through a variety of special interfaces that OMAP-L138owns.After the accomplishment of dual-core vehicle system’s hardware design, we design and implement six innovative experiments, including interrupt settings, ZPW-2000type rail signal transmission and collection, FIR filtering, FFT calculation, ZPW-2000type rail signal demodulation and off-line running. In this paper, we carry out a detailed analysis for each innovative experiment, give the flow chart of software implementation, analyze the experimental phenomena and carry out a detailed description of the problems in the experiment and software written notes.OMAP-L138dual-core track signal processing platform has the advantages of simple structure, rich interfaces and stable performance. As the ideal embedded applications, it not only can play a role in signal processing track but also has the potential application value in the field of industrial and teaching areas.