基于NRTK技术的GNSS在桥梁结构变形监测中的应用研究

摘要

研究了一种基于NRTK技术的GNSS在桥梁结构变形监测中的应用.通过模拟实验和实桥实验,对GNSS测量过程中的噪声特性进行了分析,并给出了降低测量背景噪声的小波滤波处理方案,提高了NRTK技术在桥梁结构变动态监测中的测量精度,研究结果表明:采用NRTK方案监测精度达到毫米级,能准确监测出低于10 mm的桥梁结构振动,完全满足动态监测需求.通过构建小波滤波方案,能有效降低多路径误差、延时误差、设备随机误差,造成结果的不精确性;利用石桥验证,NRTK监测结果标准差低于1.8 mm,峰值误差保持在2 mm以内,相关系数均高于93.4%,完全能满足实际用用需求.%in this paper,we study a kind of based on the technology of NRTK GNSS application in deformation monitoring of the bridge structure.By simulation experiment and real bridge,the noise characteristics are analyzed in the process of GNSS measurements,and reduce background noise measurement is presented wavelet filtering processing scheme,improves the NRTK technology in bridge structure dynamic monitoring the accuracy of measurement,the results show that the accuracy of monitoring using NRTK meet millimeter,can accurately detect the bridge structure vibration of less than 10 mm,fully meet the demand of dynamic monitoring.;By constructing wavelet filtering scheme,which can effectively reduce the multipath error,delay error,random error,the inaccuracy result.Monitoring results validated with stone bridge,NRTK standard deviation less than 1.8 mm,peak error keep within 2 mm,the correlation coefficient were higher than 93.4%,can fully meet the demand of actual use.