微型电脑应用

为了提升公共实验室远程监控精度，以ZigBee网络中对等拓扑网络为基础，设计了由ZigBee网络模块、嵌入式网关和远程监控服务器共同组成的基于ZigBee技术的公共实验室远程监控系统。系统根据周期事件触发节点方式实现信息采集、判断与事件标志位的设定，根据接收事件标志位判断结果与ZigBee网络指令数据，实现节点动作响应，由此完成公共实验室温度、烟雾、电力、光照与防盗等安全因素的实时监控。系统采用基于测距的定位技术确定事件标志位，根据实际需求从接收信息强度指示法、信号到达时间差法和信号往返时间法中选择一种算法进行测距，并根据测距结果采用三边定位与多边定位算法进行节点定位。测试结果显示，该系统网络感测精度较高，且数据传输过程中接收功率耗损和误码率分别低于-45 dBm和3.5%,运行中断概率低于0.05%,传输时延保持在170 ms内，性能较优越。

In order to improve the accuracy of remote monitoring of public laboratory, a public laboratory remote monitoring system based on ZigBee technology is designed. It is a peer-to-peer topology network in ZigBee network, and is composed of ZigBee network module, embedded gateway and remote monitoring server. According to the periodic event trigger node mode, the system realizes the information collection, judgment and completion of event flag bit setting. According to the judgment result of receiving event flag bit and ZigBee network command data, the node action response is realized, so as to realize the real-time monitoring of public laboratory temperature, smoke, power, light and anti-theft. The system uses location technology based on distance measurement to determine the event marker bit. According to the actual demand, one algorithm is selected from the received information strength indication method, signal arrival time difference method and signal round-trip time method. According to the distance measurement results, trilateral positioning and multilateral positioning algorithm are used to locate the nodes. Test results show that the system has high network sensing accuracy, and the receiving power loss and bit error rate are lower than-45 dBm and 3.5%, respectively, during data transmission, the operation interruption probability is lower than 0.05%, the transmission delay is kept within 170 ms, and the performance is superior.