东北大学学报(自然科学版) ›› 2024, Vol. 45 ›› Issue (3): 391-400.DOI: 10.12068/j.issn.1005-3026.2024.03.011
收稿日期:
2022-10-07
出版日期:
2024-03-15
发布日期:
2024-05-17
通讯作者:
敖萌
作者简介:
魏恋欢(1986-),女,辽宁沈阳人,东北大学副教授,博士生导师.
基金资助:
Lian-huan WEI, Xiao-tian WANG, Meng AO(), Xin LI
Received:
2022-10-07
Online:
2024-03-15
Published:
2024-05-17
Contact:
Meng AO
About author:
AO Meng, E-mail: aomeng@mail.neu.edu.cn摘要:
针对桥梁精细变形监测问题,提出一种考虑由温度引起的桥梁变形(简称温度变形)的升降轨合成孔径雷达(synthetic aperture radar,SAR)数据融合方法.首先,以连续箱梁桥为研究对象,分别使用升降轨SAR数据集,基于小基线子集干涉测量法(small baseline subsets interferometric SAR,SBAS-InSAR)提取视线向(line‐of‐sight,LOS)变形;然后,利用最小二乘法构建温度变形模型,分离周期性温度变形与长期性趋势变形;最后,结合桥梁结构特征,基于时空插值和奇异值分解方法实现升降轨数据融合,提取温度变形、纵桥向(即桥梁延伸方向)及垂直向趋势变形,分析桥梁变形机制及变形成因.结果表明,该方法可提取精确的桥梁温度变形及三维变形,为桥梁健康监测提供可靠的方法支撑.
中图分类号:
魏恋欢, 王啸天, 敖萌, 李鑫. 基于升降轨SAR数据的连续箱梁桥精细变形[J]. 东北大学学报(自然科学版), 2024, 45(3): 391-400.
Lian-huan WEI, Xiao-tian WANG, Meng AO, Xin LI. Detailed Deformation of Continuous Box Girder Bridge Based on Ascending and Descending SAR Data[J]. Journal of Northeastern University(Natural Science), 2024, 45(3): 391-400.
传感器名称 | 轨道方向 | 航向角/(°) | 成像模式 | 分辨率/m | 入射角/(°) | 影像数量 | 覆盖时段 |
---|---|---|---|---|---|---|---|
TerraSAR-X | 升轨 | ~348.7 | 条带模式 | 3×3 | ~23.98 | 30 | 20150825—20170606 |
COSMO-SkyMed | 降轨 | ~11.0 | 条带模式 | 3×3 | ~23.5 | 29 | 20150327—20170402 |
表1 SAR数据集详细参数
Table 1 Detailed parameters of the SAR datasets
传感器名称 | 轨道方向 | 航向角/(°) | 成像模式 | 分辨率/m | 入射角/(°) | 影像数量 | 覆盖时段 |
---|---|---|---|---|---|---|---|
TerraSAR-X | 升轨 | ~348.7 | 条带模式 | 3×3 | ~23.98 | 30 | 20150825—20170606 |
COSMO-SkyMed | 降轨 | ~11.0 | 条带模式 | 3×3 | ~23.5 | 29 | 20150327—20170402 |
图6 新立堡桥关键点变形时间序列和温度变化曲线(a)—监测点1; (b)—监测点2; (c)—监测点3; (d)—监测点4.
Fig.6 Time‐series displacements and temperature change of several key points on the Xinlipu bridge
图8 去除温度变形后新立堡桥LOS向趋势变形(a)—TerraSAR-X LOS向趋势变形; (b)—COSMO-SkyMed LOS向趋势变形.
Fig.8 LOS trending deformation of the Xinlipu bridge after removal of thermal deformation
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