| InSAR相位解缠算法比较及误差分析 |
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| 引用本文： | 吴文豪, 李陶, 陈志国, 徐侃, 张校志. 基于子带干涉技术监测大型桥梁形变[J]. 武汉大学学报 ( 信息科学版), 2017, 42(3): 334-340, 420. DOI: 10.13203/j.whugis20140306 |
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| 作者姓名： | 吴文豪 李陶 陈志国 徐侃 张校志 |
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| 作者单位： | 1.武汉大学卫星导航定位技术研究中心, 湖北 武汉, 430079;2.湖南科技大学煤炭资源清洁利用与矿山环境保护湖南省重点实验室, 湖南 湘潭, 411201 |
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| 基金项目： | 国家自然科学基金（41274048，41474014）；湖南科技大学煤炭资源清洁利用与矿山环境保护湖南省重点实验室开放研究基金（E21502） |
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| 摘 要： | 大跨度桥梁，其变形受风力、温度、车辆等因素的影响，其变化往往达到数十厘米或者更高。这使得利用雷达干涉技术监测其变形存在相位模糊度的问题。子带干涉技术可将距离向宽带频谱分解成两个甚至多个频带，然后进行干涉处理。该技术可以使雷达波长放大10~100倍，从而为m级的变形监测成为可能。详细介绍了子带干涉技术原理和处理方法，通过分别对风力和温度影响下的青马大桥子带干涉结果进行分析，验证子带干涉技术无需进行相位解缠处理在监测大型人工建筑物形变方面的可靠性和优势。
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| 关 键 词： | 子带干涉 子带分解 相位模糊 大型桥梁 雷达干涉测量 |
| 收稿时间： | 2015-10-27 |
Some Properties of Radio Waves Reflected from the Moon and Their Relation to the Lunar Surface |
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| WU Wenhao, LI Tao, CHEN Zhiguo, XU Kan, ZHANG Xiaozhi. The Application of Split Band Interferometry in Large-scale Bridge Monitoring[J]. Geomatics and Information Science of Wuhan University, 2017, 42(3): 334-340, 420. DOI: 10.13203/j.whugis20140306 |
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| Authors: | WU Wenhao LI Tao CHEN Zhiguo XU Kan ZHANG Xiaozhi |
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| Affiliation: | 1.GNSS Research Center, Wuhan University, Wuhan 430079, China;2.Hunan Province Key Laboratory of Coal Resources Clean-Utilization and Mine Environment Protection, Hunan University of Science and Technology, Xiangtan 411201, China |
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| Abstract: | The bridge displacement responses can move from several centimeters to several meters induced by a combination of four major types of loading due to wind, temperature, highway, and railway. One of the main challenges of InSAR technique is phase unwrapping. One can take advantage of this wide band to split it into sub-bands and determine the phase-frequency gradient between the sub-band interferograms. This simulates a SAR system with a much longer carrier wavelength than the actual one, which makes it possible to monitor the meter-scale deformation. This paper presents the theory and method of split bandwidth interferometry in detail, and the effectiveness and advantage of split bandwidth interferometry was verified in feasibility of monitoring structural deformation of Tsingma Bridge under the influence of different factors. |
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| Keywords: | split band interferometry sub-band decomposition phase ambiguity large-scale bridge synthetic aperture radar interferometry |
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