基于复合滤波的RSSI无线测距算法

RSSI Wireless Ranging Algorithm Based on Composite Filter

节点定位技术是Zigbee无线蜂窝网络最为重要的应用技术之一,其定位原理主要是基于接收信号强度指示(Received Signal Strength Index,RSS1)的测距算法,RSSI值的精度直接影响到定位精度。为抑制RSSI值中的复杂干扰噪声,本文提出了一种复合滤波算法,融合了中值滤波、均值滤波、高斯滤波、狄克逊法滤波等多种滤波器的特性,实验结果表明,与单一滤波器相比较,复合滤波后的RSSI值波动更小,平均误差更低,鲁棒性与自适应性更强。

Location Technology is one of the most important applications of Zigbee Wireless Cellular Network,the location principle is based on Received Signal Index,RSSI ranging Algorithm,RSSI value precision directly affects the location accuracy.In order to suppress the complex interference noise in RSSI values,a composite filtering algorithm which combines the characteristics of median filter,mean filter,gauss filter,Dixon filter is proposed.The result shows that,compared with single filter,the RSSI value of composite filter has smaller fluctuation,lower average error,stronger robustness and adaptability.