摘要
该文提出了一种在误差有界下的音频驻波液位估计算法。首先根据音频驻波的测距原理构造关于驻波波长的非线性状态方程和线性观测方程,其中将麦克风的观测误差和扬声器的状态误差建模为有界区间噪声的形式;再根据建立的系统模型和确定的误差界限,利用基于区间置信结构的状态估计算法估计出音频驻波的波长;最后根据波长的估计值换算出液位的高度。从实验结果可以看出,与直接从驻波观测值换算出液位的方法相比,加入滤波算法后,可以有效提高液位估计的精度。
A liquid level estimation algorithm based on acoustic standing wave under bounded-error condition is presented.First,the nonlinear state equation and linear measurement equation of standing wave length are formulated according to the ranging principle of acoustic standing wave,where the speaker′s system state error and microphone′s observation error are modeled as bounded interval noises.Then,the estimation of standing wave length can be obtained by state estimation method of interval belief structure.Finally,liquid level measurement will be obtained from the estimated standing wave length.The experiment shows that the proposed method can effectively improve accuracy of liquid level estimation.
出处
《杭州电子科技大学学报(自然科学版)》
2011年第6期139-142,共4页
Journal of Hangzhou Dianzi University:Natural Sciences
基金
国家自然科学基金资助项目(61004070
61104019
60934009
61034006
60874105)
中国博士后基金资助项目(0470353)
国家科技支撑计划资助项目(BAG12A08)
关键词
误差有界
驻波
液位估计
区间置信结构
bounded-error
standing wave
liquid level measuring method
interval belief structure