地基合成孔径雷达变形监测技术研究

发布时间：2018-05-19 19:59

本文选题：变形监测 + 合成孔径雷达　；参考：《重庆大学》2014年硕士论文

【摘要】：近年来，各种大型建筑如跨江桥梁、水库大坝、摩天大楼等层出不穷，给我们的生产生活带来很多便利。但它们在使用过程中尤其是在灾害环境下会发生变形，当变形量超出所能承受的范围时，，会引发灾难性后果。对这些建筑物进行变形监测是危险预警的主要手段，是分析建筑物形变机理的重要方法。为此，本论文研究了一种地基合成宽带合成孔径变形监测雷达系统与方法，通过使用合成孔径技术提高了方位向分辨率，通过使用合成宽带技术提高了距离向分辨率，通过使用干涉测量技术得到了位移量。雷达辐射多子带信号照射观测区域，并接收回波信号。接收信号的处理过程为：以合成孔径雷达成像距离多普勒算法为基础，对各子带信号进行匹配滤波，通过相干合成，完成超宽带雷达信号距离向压缩，然后进行距离校正、方位向匹配滤波、压缩成像。论文以子带为线性调频信号，带间为步进频率信号为例，分析了合成宽带信号处理的基本工作原理。论文还讨论了地基环境及轨道长度受限条件下，雷达信号处理的各个过程以及非全孔径成像的各项参数之间的关系。理论分析和仿真结果表明，本文方法可以在距离监测对象50m处，实现0.1m的距离向分辨率和0.4m的方位向分辨率，以及毫米级的位移测量精度。与传统的地基合成孔径雷达相比，本论文通过引入合成宽带信号处理技术，进一步提高了变形监测雷达距离向分辨率。
[Abstract]:In recent years, various large buildings, such as cross river bridges, reservoir dams and skyscrapers, have brought many conveniences to our production and life, but they will deform in the process of use, especially in a disaster environment. When the amount of deformation exceeds the range that it can bear, it will cause catastrophic consequences. Measurement is the main means of hazard warning and an important method to analyze the deformation mechanism of buildings.
In this paper, a wide-band synthetic aperture deformation monitoring radar system and method are studied in this paper. By using synthetic aperture technology, the azimuth resolution is improved. The range resolution is improved by using synthetic broadband technology. The displacement is obtained by using interferometry. The radar radiation multiband signal is illuminated. The processing process of the received signal is as follows: Based on the Doppler algorithm of SAR imaging distance, the signal of each subband is matched and filtered, and the signal range of UWB radar is compressed by coherent synthesis, then the distance correction, azimuth matching filtering and compression imaging are carried out. The basic working principle of the synthetic wideband signal processing is analyzed with the linear frequency modulation signal and the step frequency signal as an example. The paper also discusses the process of radar signal processing and the relation between the parameters of the non full aperture imaging under the condition of the foundation environment and the orbit length limited. The theoretical analysis and simulation results show that this paper is the paper. The distance resolution and 0.4m azimuth resolution of 0.1M and millimeter level displacement measurement accuracy can be achieved at the distance monitoring object 50m.
Compared with the traditional ground-based synthetic aperture radar, the synthetic broadband signal processing technology is introduced in this paper to further improve the range resolution of the deformation monitoring radar.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51

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