雷达流速仪测量精度关键技术研究  

Core Technology Research on High Precision for Radar Velocity Meter

作　　者：周冬生 宗军[1,2] 蒋东进 张恒[4] ZHOU Dongsheng;ZONG Jun;JIANG Dongjin;ZHANG Heng(Hydrology and Water Resources Engineering Research Center for Monitoring,Ministry of Water Resources,Nanjing 210012,China;Nanjing Automation Institute of Water Conservancy and Hydrology,Ministry of Water Resources,Nanjing 210012,China;Jiangsu NAIWCH Technology Co.,Ltd,Nanjing 210012,China;Nanjing Reno Technology Co.,Ltd,Nanjing 210019,China)

机构地区：[1]水利部水文水资源监控工程技术研究中心,江苏南京210012 [2]水利部南京水利水文自动化研究所,江苏南京210012 [3]江苏南水水务科技有限公司,江苏南京210012 [4]南京仁欧科技有限公司,江苏南京210019

出　　处：《水文》2018年第5期67-70,共4页Journal of China Hydrology

摘　　要：雷达流速仪在水文测验中的应用越来越广泛,目前该类产品主要存在流速测量精度偏低、对波浪等外界环境影响难以克服、不能适应低流速等问题。提出在快速傅里叶变换基础上使用最大值插值拟合算法提高流速测量精度的方法,采用多普勒频率加权平均算法消减波浪对流速测量的影响,利用变频方法满足较低流速测验的精度要求,并且将研究成果应用于新型雷达流速仪样机,进行了仿真试验及验证。试验表明,方法合理可行,可较好解决目前雷达流速仪普遍存在的上述问题,具有良好应用前景。Radar velocity meters are widely used in hydrological survey. At present, there are some problems from the products, such as low velocity accuracy, influence of wave or other external environment, insensitivity at low velocity and etc. The Maximum Interpolation Fitting （MIF） based on Fast Fourier Transform （FFT） has been adopted for accuracy enhancement of flow velocity computing. Besides, the frequency conversion was introduced for the accuracy of low velocity measurements. These research results were applied to a new-type radar current meter, and the tests of simulation and verification were carried out also. Field site tests indicate that the methods are reasonable and feasible, which can solve the above problems commonly existing in radar current meters.

关 键 词：雷达流速仪 多普勒效应FFT 最大插值拟合 

分 类 号：P335[天文地球—水文科学]