张思麒, 王韬, 何秀凤, 万其昌. 一种微型地基干涉变形监测雷达[J]. 武汉大学学报 ( 信息科学版), 2020, 45(11): 1801-1808. DOI: 10.13203/j.whugis20190474
引用本文: 张思麒, 王韬, 何秀凤, 万其昌. 一种微型地基干涉变形监测雷达[J]. 武汉大学学报 ( 信息科学版), 2020, 45(11): 1801-1808. DOI: 10.13203/j.whugis20190474
ZHANG Siqi, WANG Tao, HE Xiufeng, WAN Qichang. A Micro Ground-Based Interferometric Radar System for Deformation Monitoring[J]. Geomatics and Information Science of Wuhan University, 2020, 45(11): 1801-1808. DOI: 10.13203/j.whugis20190474
Citation: ZHANG Siqi, WANG Tao, HE Xiufeng, WAN Qichang. A Micro Ground-Based Interferometric Radar System for Deformation Monitoring[J]. Geomatics and Information Science of Wuhan University, 2020, 45(11): 1801-1808. DOI: 10.13203/j.whugis20190474

一种微型地基干涉变形监测雷达

A Micro Ground-Based Interferometric Radar System for Deformation Monitoring

  • 摘要: 地基多输入多输出(multiple-input multiple-output, MIMO)雷达能够避免使用大尺寸天线或长线性导轨,与真实孔径雷达和合成孔径雷达相比更适合在隧道等狭小空间中使用。研究了一种基于MIMO技术的微型地基干涉雷达原理与方法。该雷达采用毫米波实现设备的微型化,采用MIMO技术构建大尺寸虚拟孔径天线,提升方位角分辨率,采用宽带调频连续波获得高的距离分辨率。利用傅里叶变换和波束形成实现监测目标区域的快速成像,与传统后向投影算法相比具有更好的实时性。利用差分干涉测量技术得到目标在雷达视线方向的高精度变形信息。实验原型样机为2发4收天线结构,发射77 GHz宽带调频连续波信号,提供4 GHz扫描带宽。使用步进电机控制角反射器在导轨上运动模拟目标变形。实验结果表明,所述雷达系统能够对短距离目标进行准确成像,具有较强的抗干扰能力,可获取优于亚毫米级的位移精度。

     

    Abstract:
      Objectives  Ground-based multiple-input multiple-output(MIMO) radar can avoid using large antennas or long linear guide rail. Compared with real aperture radar and synthetic aperture radar, MIMO radar has more advantages under the limitation of volume and weight. It is more suitable for use in narrow spaces like tunnels. In order to be used in these scenes, a micro ground-based interferometric radar based on MIMO technology is presented and discussed.
      Methods  Millimeter wave frequency band is used to achieve the miniaturization. MIMO technology can be used to construct large-scale virtual aperture antenna to improve angular resolution. The high range resolution is provided by the wideband frequency modulated continuous wave (FMCW) technology. Fast Fourier transform and beamforming algorithms are used to replace the traditional back projection algorithms as imaging algorithms, which can achieve better real time performance. Differential interferometry can obtain the high-precision deformation of the target in the direction of line of sight.
      Results  The prototype radar is a 77 GHz FMCW radar based on two transmitter antennas and four receiver antennas, can offer up to 4 GHz sweep bandwidth. Corner reflector is moving along a guide rail under control of stepper motor to simulate the small deformation of the monitoring target. The displacement curve of the corner reflector that varied with time is measured by the radar and compared with its actual displacement curve.
      Conclusions  The experimental results show that the radar system can get the image of short-range targets, obtain better displacement accuracy than sub-millimeter and have strong anti-interference ability.

     

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