数字式雷达液位测量系统  

Design of a Digital Radar Fluid Surface Positioning System

作　　者：陈海[1] 王新民[1] 沈宁[1] 

机构地区：[1]西北工业大学自动化学院,陕西西安710072

出　　处：《测控技术》2007年第1期26-29,共4页Measurement & Control Technology

摘　　要：针对传统液位测量系统精度低、抗干扰能力差、接触式的特点,介绍一种利用雷达原理研制的数字式液位测量系统。本系统采用调频测量法,用C8051F020单片机作为频率测量模块的核心。运用自相关函数对信号进行滤波;快速傅里叶变换(FFT)算法进行频域分析;移频法对频率进行细化,最后得到液位的高度。该系统具有很强的适应能力和完善的接口,在实测中取得了满意的精度。A digital fluid surface positioning system is designed based on the radar theory. The position of the fluid surface can be decided by the frequency difference between the original and returning signal. The system is constructed based on the C8051F020 microprocessor. To analyze the difference signal, the autocorrelation function is employed for signal filtering, and the FIT is used for frequency domain analysis. The measurement precision is under low, The system also has variable interfaces for further expansion.

关 键 词：液位测量 雷达 快速傅里叶变换 移频法 自相关函数 

分 类 号：TP302[自动化与计算机技术—计算机系统结构] TN95[自动化与计算机技术—计算机科学与技术]