极端温度条件对无线传感器通信可靠性影响的实验研究

Experimental study on the influence of extreme temperature conditions on the reliability of wireless sensor communication

该文借助高低温实验箱来模拟极端温度,通过实验研究极端温度对大量部署在室外配电台区无线传感器节点通信可靠性的影响,并且对无线传感器节点在实际环境中采集到的数据进行分析。实验中,采用无线信号接收强度(received signal strength indication,RSSI)和数据丢包率(packet lost ratio,PLR)作为评估通信可靠性指标。试验结果表明:当发射端或接收端处于极端温度下时,丢包率基本都维持在1%左右,可以合理推测丢包率和温度之间的关联性不大,丢包的原因更多在于硬件本身的参数设置;当接收端处于极端温度下时,高温会导致接收端的RSSI值降低,而低温对RSSI无太大影响;当发射端处于极端温度下时,极高温度和极低温度对接收端的RSSI的影响不明显,在相同发射功率下不同温度时的RSSI差别不大,并且随着发射功率的增大变化也不明显,基本在-70dBm附近波动。

With the help of high and low temperature experimental box to simulate the extreme temperature,by means of the experimental method,we study the influence of extreme temperature on the communication reliability of a large number of wireless sensor nodes deployed in the outdoor distribution area,and analyze the data collected by wireless sensor nodes in the actual environment.In the experiment,the received signal strength indication(RSSI)and packet loss ratio(PLR)are used to evaluate the communication reliability.The experimental results show that:when the transmitter or receiver is in the extreme temperature,the packet loss rate is basically maintained at about 1%,it can be reasonably speculated that the correlation between packet loss rate and temperature is not large,and the reason for packet loss is more due to the parameter setting of the hardware itself;When the receiver is in the extreme temperature,the RSSI value of the receiver will decrease at high temperature,while the RSSI value of the receiver will not be affected at low temperature;When the transmitter is at the extreme temperature,the influence of very high temperature and very low temperature on the RSSI of the receiver is not obvious.Under the same transmit power,the RSSI of different temperature has little difference,and the change is not obvious with the increase of transmit power,which fluctuates around-70 dBm.