| With the quick development of economy, cities' population density is increasing, which leads to great traffic pressure. Today, the development of underground rail traffic has been the only method for releasing this pressure. Metro information system is on the way to the passenger-centric operation mode, and it necessarily proposes the requirement of LCD metro dynamic map system's development and application.LCD metro dynamic map system accepts train controller's message, which is the basis for control unit to select current scenes, and then generates video signals. After video encoder's encoding, the video signals are converted into low-bandwidth video bit stream to fit transmission requirement. Video decoders accept video stream through Ethernet and reconverted it into video signals for LCD screen's display. According to the above requirements, this system's overall frame is designed, then design frame and implement about video signals'conversion are introduced and at last, this thesis focuses on the design of this system's control unit, which is the most kernel module. On ETX module, VGA interface for displaying, RS-232 interface for control and Ethernet interface for maintenance are integrated into control unit. Based on Windows CE OS, control unit implements communication between itself and some other modules in this system or maintenance tools, management of all scenes, different scenes'switching and every scene's display.The old LED metro map system's information designation is too simple to satisfy with the need of today's metro operation mode. LCD metro dynamic map system can implement high-resolution, digital signal transmission and multi-scenes switching, and resolve with the old dynamic map system's disadvantage. So far, LCD metro dynamic map system has been successfully used in Shenzhen Metro Line, and running well. |
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