Design And Implementation Of C-Band Ground Based MIMO Deformation Monitoring Radar

With the acceleration of urbanization process,the state builds a lot of infrastructures.While the number of infrastructure is increasing,there are also many problems.For example,in the construction and use of highway,railway,dam,reservoir and other infrastructure projects,due to the interference of natural environment and human activity factors,there is the possibility of slope collapse in the above projects,which threatens the safety of people's property and lives seriously.At present,the solution of slope deformation monitoring is time-consuming,limited monitoring area,low flexibility,unable to achieve all-weather monitoring,and expensive.Therefore,it is particularly important to seek a solution which can realize and high-precision measurement,portable equipment,all-weather and low-cost deformation monitoring.In this dissertation,according to the application requirements of slope monitoring,combined with the analysis of existing methods and technologies,a solution of C-band ground MIMO deformation monitoring radar is proposed,and the scheme is designed and implemented.The main contents of this dissertation are as follows:(1)Design and implementation of miniaturization system.FMCW technology is introduced to realize the accurate measurement of the range direction of the observation point;combined with MIMO technology,the high resolution of the azimuth direction of the observation point can be realized under the condition of a certain number of physical antennas.Combining FMCW and MIMO radar systems,a portable slope deformation monitoring radar with all-weather and non-contact characteristics is designed and implemented,which can effectively avoid the interference of environmental factors.(2)The reasonable arrangement of antenna elements is designed.Aiming at the overlapping problem of MIMO Radar Virtual Array,the idea of Coprime number is introduced by referring to sparse array.In order to use less physical elements to be equivalent to more virtual elements.(3)Solve the problem that ADC needs to collect the whole frequency modulation cycle data.FPGA is used to design and implement the system control timing,complete the control antenna switching according to the rules and control the ADC acquisition time.(4)Build different test environments,complete the system performance test.Test the performance of the frequency source module and mixer module designed in this dissertation,and get the performance index.Verify the imaging ability of the system in different environments,and preliminarily test the measurement accuracy of the system.The test results show that the slope monitoring radar system designed and implemented in this dissertation can realize all-weather and high-precision deformation measurement,and the measurement accuracy can reach sub millimeter level.Compared with the existing scheme,it has the advantages of small volume and low cost,and has a good application prospect.