Research And Verification Of Key Technologies Of Building Deformation Monitoring Radar

Deformation monitoring is an important means for safety assessment and early warning of natural and man-made disasters such as building collapse,ground subsidence and engineering construction.According to the deformation state of the building and the characteristics of the building itself,the safety early warning and disaster prevention and control of the building are of important scientific significance and research value for protecting the safety of people’s lives and properties.The radar deformation meter can determine the overall deformation state of the target by measuring several monitoring points on the target surface by microwave,that is,by measuring the displacement,angle,speed and other parameters of the target deformation point changes to carry out high-precision deformation monitoring of buildings,with the advantages of high resolution,no distance blind zone,mature technology,and so on.In response to the high standards and high precision requirements in the building deformation measurement specifications,a high-precision deformation measurement algorithm based on Frequency Modulated Continuous Wave(FMCW)was studied,and the purpose of building facade deformation monitoring was realized.In the process of monitoring the deformation of the building facade by the radar deformer,there are key problems of the phase method displacement and angle measurement range being too small,as well as the optimized acquisition technology of the signal based on the difference frequency sweep phase method.Aiming at the key issues in the displacement measurement and angle measurement based on the phase method,this thesis studies a displacement and angle measurement range expansion technology based on the difference frequency sweep phase method,which meets the high precision,high standards and requirements of building deformation monitoring.Large-range measurement criteria and specifications.Aiming at the optimized acquisition technology of the difference frequency sweep signal,this article changes the waveform system on the same sawtooth linear frequency modulation continuous wave,and realizes the acquisition of the difference frequency signal in the phase method.This thesis has completed the design of the radar system,and after theoretical simulation and field experiments,the high-precision displacement measurement and angle measurement algorithms proposed in this thesis and the corresponding displacement and angle measurement range expansion technology based on the difference frequency sweep phase method are carried out.Through the performance verification,while realizing the high-precision deformation monitoring of the building facade,the phase ambiguity problem is solved reasonably,and the high-precision,large-range deformation monitoring effect is achieved.