航电中继系统任务实时调度设计  

Design of Real-Time Task Scheduling for Avionic Relay Systems

作　　者：樊智勇 鲁彦 刘涛 FAN Zhiyong;LU Yan;LIU Tao(Civil Aviation University of China Engineering Technology Training Center,Tianjin 300300,China;Civil Aviation University of China School of Electronic Information and Automation,Tianjin 300300,China)

机构地区：[1]中国民航大学工程技术训练中心,天津300300 [2]中国民航大学电子信息与自动化学院,天津300300

出　　处：《电光与控制》2021年第1期56-60,共5页Electronics Optics & Control

基　　金：国家自然科学基金委员会中国民航局民航联合研究基金(U1533201);中央高校基本科研业务费项目中国民航大学专项(3122017019)。

摘　　要：研究了单处理器嵌入式实时系统的多任务优先级分配方法,首先,选择截止期单调(DM)优先级分配方法为实现航电中继系统的采集激励软件而划分的多任务分配优先级,然后,结合VxWorks的优先级抢占式调度算法对该任务集进行可调度性理论分析和计算,给出了基于VxWorks的数据采集激励软件的一般调度设计过程,最后,在基于该调度算法的航电中继系统上进行了数据转发实验。实验结果表明,航电中继系统转发数据的最大延迟时间不超过3.5 ms,可实现4种类型数据的稳定、正确转发。因此,基于DM优先级分配的抢占式调度算法的航电中继任务调度设计满足实时性和可靠性要求。The multi-task priority allocation method of a real-time embedded uni-processor system is studied.Firstly,the Deadline Monotonic(DM) priority allocation method is selected and implemented for the multiple tasks, which are classified for running the acquisition and incentive software of the avionic relay system.Then, by using the preemptive priority-scheduling algorithm of VxWorks, the schedulability of the task set is theoretically analyzed and calculated.The general process of the scheduling design for the VxWorks-based data acquisition and incentive software is also given.Finally, a data-forwarding experiment was performed on the avionic relay system based on the scheduling algorithm.The experimental results show that the maximum delay time for the avionic relay system to forward data does not exceed 3.5 ms, which can realize the stable and correct forwarding of 4 types of data.Therefore, the avionic-relay task scheduling design based on the preemptive scheduling algorithm of DM priority allocation can meet the real-time and reliability requirements.

关 键 词：航电系统 中继 实时调度 优先级分配 

分 类 号：TP311.52[自动化与计算机技术—计算机软件与理论]