无线传感节点的滤波处理探究

Research on Filter Processing of Wireless Sensor Node

本文介绍了无线传感节点中模拟滤波器和数字滤波器的设计,结合两种滤波器共同消除传感节点在信号采集过程中存在的射频干扰和频率混叠。针对节点在高采样率采集而要求过渡带窄的情况,在不降低滤波效果的前提下,进行下采样并分级滤波,降低了数字滤波的计算量。

This paper introduces the design methods of analogue filter and digital filter design in wireless sensor node.Two kinds of filter are both used to eliminate frequency interference and frequency aliasing in the process of sensor node's signal acquisition.For nodes in a high sampling rate with narrow transition zone,without reducing the filtering effect,sampling and hierarchically filtering,the amount of computation of the digital filter are reduced.