无串扰超声测距系统编码激励序列优化与分析  

Optimization and Analysis of Coded Excitation Sequences in Non-crosstalk Ultrasonic Range System

作　　者：姚振静[1] 孟庆浩[1] 李根旺[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072

出　　处：《压电与声光》2010年第3期502-505,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(60475028;60875053);教育部"新世纪优秀人才计划"基金资助项目(NCET)

摘　　要：为消除串扰,采用混沌脉冲位置调制(CPPM)构造每个超声换能器的编码激励发射序列,相关分析法被用于识别回声序列。回声序列的相关特性决定超声测距的准确性和精度,回声序列的能量影响超声测距的最远可测距离。为使回声序列的相关特性和能量最优,采用带精英策略的非支配排序遗传算法(NSGA-II)优化了CP-PM发射序列。用小波变换分析了优化后发射序列及回声序列的特点,得到了影响回声序列相关特性和能量的因素。该法在两路Polaroid 600系列静电超声换能器测距系统中获得了验证。To eliminate the ultrasonic crosstalk,Chaotic Pulse Position Modulation（CPPM） was used to construct the coded excitation triggering sequence for each ultrasonic transducer.The correlation analysis was applied to identify the echo sequence.The accuracy and the maximum measurable distance of ultrasonic range system were determined by correlation characteristic and energy of echo sequence respectively.To obtain the better correlation characteristic and the larger echo energy,the Non-dominated Sorting Genetic Algorithm-II（NSGA-II） was adopted to optimize the CPPM triggering sequence.The influence factors of correlation characteristic and energy of echo are obtained via analyzing the optimized triggering sequences and echo sequences by wavelet transform.Experiments using two Polaroid 600 series electrostatic transducers validated the feasibility of the proposed methods.

关 键 词：超声换能器 串扰 编码激励 混沌脉冲位置调制 多目标优化 小波变换 

分 类 号：TN918.66[电子电信—通信与信息系统] P225.6[电子电信—信息与通信工程]