摘要
时钟同步是传感器网络通信中的关键技术,但是在有限节点传感网络信息传递过程中,多采用先同步局部范围的节点,在扩展到所有节点,在局部与整体的切换过程中,信息在不同层传递,存在层间不定的时间同步随机时间延迟,传统的传感网络时间延迟消除方法是假定不同网络层时延一致的情况,对应层同量补偿误差较大,误差消除效果不佳。提出采用自回归积分滑动控制算法的时钟同步累计误差补偿方法。在传感通信中,将传感网络分割为若干个子单元,获取对应局部区域的时间域窗口结构,在指定时域窗口中将所有的节点展开,计算传感网络累计延迟率。根据时钟同步累计误差补偿目标函数,建立自回归积分滑动控制模型,实现时钟同步累计误差补偿。实验结果表明,利用改进算法进行传感通信网络的时钟同步累计误差补偿,能够降低传感网络的延迟性,满足传感网络通信需求。
A compensation method for clock synchronization accumulated error is presented based on the regres- sion integral sliding control algorithm. In a sensor communication, the sensor network is divided into several sub- units, a window structure in time domain is obtained corresponding local area, all nodes are expanded in a specified time window, and sensing network delay rate is computed. According to an objective function, a regression integral sliding control model is established to realize the clock synchronization accumulated error compensation. Experimen- tal results show that the improved algorithm can reduce the delayed onset of sensor network and compensate for the clock synchronization accumulated error effectively.
出处
《计算机仿真》
CSCD
北大核心
2014年第10期346-349,共4页
Computer Simulation
关键词
时钟同步
累计误差
传感通信网络
Clock synchronization
The accumulated error
Sensor communication network
