Design And Implementation Of A Ground-based MIMO Micro-deformation Monitoring Radar

With the rapid development of China's infrastructure construction,the number of large buildings such as tunnels and bridges is also increasing rapidly.During the construction and use of the large buildings,the building will occur a certain degree of deformation due to various factors.Once the deformation degree exceeding the tolerance of the building,there will be a danger of building's overall collapse,and threatening people's lives and property security.Although the deformation monitoring technology has achieved initial application in some fields,it is vulnerable to environmental factors,and has poor portability and high cost.Therefore,a new method of deformation monitoring is urgently needed.For the actual needs of large-scale building deformation monitoring,this paper designs a MIMO radar system that has capability of real-time monitoring for shortdistance and medium-distance target points in complex environments.The principle of deformation monitoring technology has introduced in this paper,and the system structure and the components of hardware and software of the radar are also discussed.Finally,the whole system was tested,verified and analyzed.The system uses the millimeter wave system to solve the problems that the existing monitoring technology is vulnerable to environmental interference and has poor portability.Use FMCW technology to send and receive wideband radar signals,achieving accurate measurement of the distance direction from observation points,and to obtain high range resolution.Use MIMO technology to obtain high azimuth resolution under certain conditions of radar physical size.Combined with FMCW and MIMO technology,the radar can accurately image the target area.By optimizing the traditional radar imaging algorithm,the data calculation speed is improved,and the hardware resource consumption is reduced,and the overall real-time performance of the system is improved.The phase interferometry and phase unwrapping algorithm are used to obtain the small deformation information of the monitoring point from the radar complex image,and finally achieving high-precision measurement of the monitoring target with submillimeter accuracy.The micro-deformation monitoring radar system in this paper is composed of three parts,the single-line rail linear slide module,the millimeter-wave radar end and the radar data processing and imaging part.By using the linear slide module to control the small displacement of the slide platform,simulate the small deformation of the target surface.The millimeter wave radar end consists of AWR1642 and DCA1000 EVM,using it to monitor the real-time displacement of the target and obtain the original ADC data.After subsequent data processing,obtain the radar image and the displacement of the monitored target.The experimental results show that the designed MIMO deformation monitoring radar system can realize all-weather,non-contact and real-time high-precision measurement.Compared with the prior art,the volume,weight and cost of the monitoring system are greatly reduced,which is more advantageous for practical engineering applications.