Schedulability of train speed and position measurement system based on time-triggered multi-sensor fusion

作者：Ma Weigang; Ma Jianfeng^*; Hei Xinhong; Cao Yuan

来源：Journal of Southeast University(Natural Science Edition), 2013, 43(6): 1190-1194.

DOI：10.3969/j.issn.1001-0505.2013.06.011

• Multi-sensor fusion
• Position measurement systems
• Schedulability analysis
• Scheduling policies
• Scheduling tasks
• Time triggered
• Train control systems
• Train speed controls

The scheduling policy is studied with the time-triggered static scheduling table. The scheduling model of the multi-sensor fusion poisoning system is presented. The scheduling models of hard time constrained periodic tasks, soft time constrained aperiodic tasks and timeout detection tasks are established. The system time consumption and the CPU utilization rate are computed based on the task-time requirement function. In order to ensure the predictability and safety of the system, a schedulability theorem is proposed under both hard and soft time limits. The field tests on the train speed control and the positioning system show that the proposed method can adequately schedule both hard and soft time constrained tasks, and the system utilization rate and responding time meet the requirements of train control systems.

• 出版日期2013
• 单位北京交通大学; 西安电子科技大学