基于FMCW毫米波雷达的测距值气象改正模型的建立  

Establishment of a meteorological correction model of ranging values based on FMCW millimeter-wave radar

作　　者：曹彬 张小溪 邹进贵[1] 赵胤植 CAO Bin;ZHANG Xiaoxi;ZOU Jingui;ZHAO Yinzhi(School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China)

机构地区：[1]武汉大学测绘学院,湖北武汉430079

出　　处：《测绘通报》2024年第S02期204-210,共7页Bulletin of Surveying and Mapping

基　　金：国家自然科学基金(41871373)

摘　　要：FMCW毫米波雷达具有低功耗、低成本、全天时全天候、精度高等优点,选择其作为监测设备,可以很大程度上满足监测需求,同时其操作便捷,携带方便。但是有研究表明,FMCW毫米波雷达在进行长时序观测时,雷达测距值会随着空气中的气象因素(温度、湿度、气压等)的改变而发生变化,导致测量精度降低。基于此,本文针对气象因素对毫米波雷达测距精度的影响而展开研究,提出基于调制载波折射率公式构建毫米波雷达的气象改正模型,改正后雷达测距值随时间的波动程度相较于改正前明显降低,测距值的标准差较改正之前降低了30%左右,与温度和湿度的相关系数均降低了50%及以下。结果表明,该模型在一定程度上削弱了气象因素对毫米波雷达测距值的影响,但是削弱效果有限,模型还有待优化。Compared with other monitoring equipment,FMCW millimeter wave radar has the advantages of low power consumption,low cost,all-weather all-day,high accuracy,etc.Choosing it as the monitoring equipment can meet the monitoring needs to a large extent,and at the same time,its operation is more convenient and easy to carry.However,some studies have shown that when FMCW millimeter wave radar conducts long time series observation,the radar ranging value will change with meteorological factors(temperature,humidity,air pressure,etc.)in the air,leading to the decrease of measurement accuracy.Based on this,this paper aimed to study the influence of meteorological factors on the ranging accuracy of millimeter-wave radar,and proposed to construct a meteorological correction model of millimeter-wave radar based on the modulated carrier refractive index formula,and the degree of fluctuation of radar ranging value over time after correction was significantly reduced compared with that before correction,the standard deviation of the ranging value was reduced by 30%compared with that before correction,and the correlation coefficients with the temperature and humidity were both reduced by 50%or less.It could be concluded that the model had weakened the influence of meteorological factors on the millimeter-wave radar range values to a certain extent,but the weakening effect was limited,and the model still needed to be optimized.

关 键 词：FMCW毫米波雷达 气象因素 测距值 气象改正模型 

分 类 号：P225.1[天文地球—大地测量学与测量工程]