一种无线传感网中微秒级时钟同步设计

摘要

Based on the principle of IEEE 1588 clock synchronization theory, a clock synchronization scheme for contained each node of star topology of wireless sensor networks is put forward, the synchronous process be tween two nodes is introduced, the factors that affects the synchronization accuracy are analyzed. Based on this, a system realization method by the physical timestamp mark as a key technology is designed, the system test platform is constructed by using FPGA and wireless module nRF24L01. Clock synchronization accuracy derived through analysis of test results can reach microsecond. The overall design is simple and has a high practical value.%基于IEEE 1588时钟同步原理的思想,提出了一种星形无线传感网中各节点的时钟同步方法,具体介绍了两节点间同步过程的实现原理,分析了影响同步精度的关键因素,在此基础上设计了一种以物理层时间戳标记为关键技术的实现方式.利用FPGA和无线模块nRF24L01构建了系统的测试平台,通过对测试结果的分析得出时钟同步精度可以达到1μs,总体设计简单并具有较高的实用价值.