Research On The Key Technology Of Radar Deformation Instrument

In the fields of geological monitoring and engineering construction,the monitoring of deformation is an important means to ensure safety.The radar deformation instrument has a wide range of applications in deformation monitoring by measuring the surface displacement of the deformation body by microwave.However,the traditional radar deformation instrument faces the interference of the same frequency band signal in the electromagnetic environment,and the displacement vector of the target cannot be obtained,which influence the measurement accuracy and reliability of the radar deformation instrument.The key problems faced by radar deformation instrument are the influence of interference signal on measurement and the lack of displacement vector measurement method.In this paper,the anti-interference strategy of radar deformation instrument based on spectrum sensing is proposed to avoid these problems,the high-precision displacement measurement algorithm for anti-jamming is studied,and the implementation method of vector displacement measurement is discussed.Aiming at the problem that the radar deformation instrument measurement accuracy is susceptible to the interference signal in the same frequency band,an anti-interference technology based on spectrum sensing is proposed,which can select the interference-free frequency band for radar deformation instrument measurement.The spectrum sensing anti-interference strategy of the radar deformation instrument is studied.Compared with the complex calculation and high delay of the traditional spectrum sensing strategy,this strategy can achieve fast frequency selection in spectrum sensing by creating a working list and multi-device cooperative working method.Aiming at the high precision requirement of deformation measurement,the high-precision displacement measurement algorithm based on FMCW(Frequency Modulated Continuous Wave)is studied.Through the interferometry measurement in FMCW,high-precision displacement measurement can be realized while anti-interference.For this algorithm,there is a problem that the range is too small due to phase ambiguity.A range extension technique based on differential frequency sweep measurement is proposed,which can realize the extension of displacement range while ensuring measurement accuracy.For the problem that the current radar deformation instrument can not measure the displacement vector,a method for measuring the displacement vector by using multi-measurement master station is proposed,and various problems affecting its measurement accuracy are studied.Through simulation and experimental verification,the proposed anti-jamming technology based on spectrum sensing and FMCW-based interferometry measurement algorithm can achieve the avoidance of high-power interference signals and the elimination of low-power interference signals,these methods can solve the anti-interference of radar deformation instrument.The differential frequency sweep measurement algorithm based on FMCW and multi-measurement master station vector displacement method enables high-precision,large-range vector displacement measurement.