摘要
在无线传感器网络中,一般采用电池供电,如何取得精度和功耗的平衡十分重要。应变片功耗与其他传感器相比大得多,直接决定无线节点总功耗。系统设计时,不但要考虑电路参数和器件噪声对精度的影响,功耗分析也很必要。从无线节点整体框架出发,系统分析了模拟和数字电路中精度和功耗的影响机理,建立了完整的理论模型。精度和功耗同时受电桥电压影响,电桥电压越高,精度越高,但功耗也越大,精度与功耗相互制约。以电桥电压和器件参数为影响因素,提出了在保证测量精度的同时,减小电路功耗的方法。在设计无线应变测量节点时,该研究可以为实现系统精度和功耗的平衡提供理论指导。
Batteries are generally used to power the wireless sensor networks,so it ＇ s very important to get the balance of precision and power consumption.The power of strain gauge is much larger than any other sensors and takes a large part of the power of whole node.In the design of wireless strain measurement node,it is important to consider the influence of circuit parameters and component noise to the precision,as well as the power consumption.The influence mechanism and main factors of precision and power consumption are obtained by analyzing the architecture of the analog and digital circuit of the wireless node,and it is modeled the relationship between them theoretically.Precision and power consumption are both effected by bridge voltage,and higher the bridge voltage is,the precision is higher but the power consumption is greater.Precision and power consumption restrict each other.It is proposed a method to get better tradeoff with the influence of bridge voltage and component parameters.This study can provide instructions theoretically to balance the precision and power-consumption in the design of wireless strain measurement node.
出处
《传感技术学报》
CAS
CSCD
北大核心
2012年第9期1289-1293,共5页
Chinese Journal of Sensors and Actuators
基金
中央高校基本科研业务费项目(CDJXS11122218
CDJRC10120010)
关键词
无线传感器网络
精度
功耗
应变
电路
wireless node
strain
precision
power consumption
circuit
