Research On The Key Technologies Of Expressway Toll System Based On Linux

The toll system is an important part of expressway management system, and its basic function is to collect tolls. With the rapid development of the domestic economy, highway traffic volume is increasing year by year. In order to shorten the tolling time for a single vehicle and improve highway traffic rate, it becomes a very urgent task to design a new toll system. The highway toll systems currently in use are substantially developed on the Windows os. Due to limitations of Windows os itself, these toll systems are featured in poor security, high cost and difficult maintenance. In contrast, using Linux os to design highway toll system can solve all kinds of defects previously mentioned. Therefor, the key technologies for designing new highway toll system based on Linux os are studied in detail.In this paper, the toll system is divided into two parts by using C/S architecture:server and client, and then their functions are designed and implemented respectively. The server provides remote boot and installation, data management, security testing, online updates and other services; the client is responsible for collecting tolls, and uploading toll data. Each toll station consists of a server and multiple lane client. When designing the client system, the kernel, file system, and special hardware device drivers are conducted in-depth customization and optimization. The results show that system boot speed and resource consumption has been greatly improved.For the needs of real-time monitoring, this paper designs and implements a video capture optimization solution based on Overlay display mode. Then the video window covering problems and image blur problems for capturing fast-moving vehicles are analyzed and solved respectively. Compared with traditional methods, When using the Overlay display mode, video data stream does not require the CPU processing, instead, is directly sent to the computer’s memory by DMA channel to be displayed. The test results show that this method can significantly improve the video frame rate, and greatly reduce computer resource consumption.Since the toll systems currently in use are very difficult to maintain, this paper designs and implements a rapid deployment and recovery solution based on network. C/S architecture is introduced. The server implements remote start service and provides installation and configuration files stored in a fixed directory for client. Then the client performs a network boot through the remote start service, and run an automatic setup program to download installation and configuration files. After download is complete, the automatic setup program continues to install all the files to the client’s local disk. When everything is done, the client will get a completely new system. The solution presented supports multiple clients for system installation and recovery simultaneously, and is suitable for large-scale deployment of the toll system. Furthermore, it can significantly save system deployment and maintenance costs.