二相编码信号发射的超声液位测量误差分析  

Error analysis of the ultrasonic liquid level measurement by binary phase coded signal

作　　者：李鹏[1] 王银娟[1] 尹杰[1] 

机构地区：[1]南京信息工程大学电子与信息工程学院江苏省气象探测与信息处理重点实验室,江苏南京210044

出　　处：《安徽大学学报（自然科学版）》2014年第5期52-58,共7页Journal of Anhui University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41075115);江苏省高校自然科学研究计划资助项目(10KJB510012)

摘　　要：二相编码信号发射的超声波液位测量不仅可以改善测量的准确性,而且能够增强测量系统的抗干扰性能.研究表明优化测量系统的发射信号波形可以明显提高测量精度和改善系统稳定性.采用Barker二相编码信号作为发射信号、压缩回波信号能量、优化信号处理、引入测量误差补偿,形成一种新的超声液位测量方法,并进行仿真验证.仿真结果表明:使用自适应白化滤波器、相关处理技术和最小二乘法曲线拟合,对测量结果进行修正,可以减小Barker码激励的超声液位测量误差,提高测量准确性.The ultrasonic liquid level measurement by the binary phase coded excitation can not only improve the measurement accuracy,but also strengthen the anti-jamming performance of the measuring system.The research results show that the system of transmitting wave which is optimized could improve the accuracy of measurement and stability.A new ultrasonic liquid level measurement technology was formed in this paper which was verified through experiments by using Barker coded wave transmission,compressing the echo signal energy,optimizing signal processing methods and measuring error compression.The experimental results demonstrated that the methods could reduce the measuring errors of the ultrasonic liquid level measurement by combining the Barker phase coded excitation,the adaptive filter and the correlation energy compression technology.In addition,it could improve the measurement precision.

关 键 词：超声波 二相编码 液位测量 误差分析 

分 类 号：TB551[理学—物理]