Automatic Interference Elimination Algorithm for Ultrasonic Multiple Access Method
Automatic Interference Elimination Algorithm for Ultrasonic Multiple Access Method
复制标题
超声波多址接入方式的自动干扰消除算法
DOI：
10.1143/jjap.47.4319
复制
发表时间：
2008
影响因子：
1.5
通讯作者：
H. Hachiya
中科院分区：
文献类型：
--
作者：
Yong Wang;T. Suginouchi;M. Hashimoto;H. Hachiya
超声波传感系统目前用于汽车和移动的机器人。针对多个超声波传感系统在小范围内工作的情况，提出了一种基于M序列扩频技术的超声波多址接入方法。然而，UMAM的效果取决于预设的阈值水平。在本文中，我们考虑一个自动干扰消除算法的UMAM。在干扰信号比已知的条件下，利用两传声器之间的归一化相关函数来研究UMAM中阈值电平的影响，进而由归一化相关函数的最大值来确定最佳阈值电平。利用一组合适的训练样本，可以得到最佳阈值与干扰信号比之间的近似函数。从实验结果来看，自动干扰消除算法是一种有用的工具。
Ultrasonic sensing systems are currently used in automobiles and mobile robots. Recently, under conditions of multiple ultrasonic sensing systems operating in a small area, we proposed an ultrasonic multiple access method (UMAM) based on the spectrum-spread technology using M-sequence code. However, the effect of the UMAM depends on the preset threshold level. In this paper, we consider an automatic interference elimination algorithm for UMAM. Under conditions with a known interference-signal ratio, the normalized correlation function between two microphones can be used to investigate the effect of the threshold level in UMAM, and further, the optimal threshold level can be obtained from the maximum value of the normalized correlation function. Using a set of suitable training examples, the approximation function between the optimal threshold and the interference-signal ratio can be obtained. From the experimental results, the automatic interference elimination algorithm is a useful tool.