计算机科学 ›› 2019, Vol. 46 ›› Issue (8): 133-137.doi: 10.11896/j.issn.1002-137X.2019.08.022
倪晓军, 高雁, 李凌锋
NI Xiao-jun, GAO Yan, LI Ling-feng
摘要: 基于接收信号强度指示(Received Signal Strength Index,RSSI)的测距技术因其低成本及低复杂度被广泛用于无线传感网络(WSN)定位技术中。由于RSSI值易受环境的影响,即使在同一位置采集到的RSSI值也会出现波动、突变,从而导致测距结果误差较大。在分析RSSI测距原理和当前常见的滤波算法的基础上,通过实验比较单一滤波的效果,综合单一滤波的优势,提出了一种基于狄克逊检验法滤波、中位值滤波及高斯滤波的混合滤波算法。实验首先利用线性回归算法优化RSSI测距模型的参数,再通过混合滤波过滤异常RSSI值来获得最优值,以实现准确测距。实验结果显示,与单一的滤波算法相比,混合滤波算法能明显减小RSSI值的波动,更为有效地剔除异常RSSI值,且滤波后的RSSI值更接近理想值,测距误差更小,证明了混合滤波算法是有效且可行的。
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