The Technique Research On Microwave High-precision Remote Displacement Measurement

Landslide monitoring can provide early warning of landslides and minimize the losses caused by disasters.Displacement monitoring is the most direct and effective way of landslide monitoring.In addition,displacement monitoring is also widely used in engineering construction.The construction of dams,bridges,roads,and constructions are of great research significance and value.This thesis reviews the research dynamics at home and abroad,focuses on the characteristics of displacement monitoring and high-precision monitoring requirements in harsh environments,studies the displacement measurement technology,and completes the overall design of the program.Finally,the practicality of the system is proved through prototype development and field experiments..The main tasks include:1.Research on key technologies of microwave high-precision remote displacement measurement systemStarting from the basic principle of microwave displacement measurement,the three displacement measurement methods are compared and the interferometric method is used to measure the displacement finally;the waveform system of remote displacement measurement is determined,and the “phase folding” phenomenon and the effect of the initial distance and angle on the measurement are performed.Based on the analysis of background clutter generation mechanism,the effect of background clutter on the phase and the maximum measurement range was studied.It was inspired by the orthogonal polarization technique of the antenna and the clutter suppression method was studied.A variety of high-precision phase-difference measurement techniques,including correlation function method,spectral analysis method,and IQ demodulation method,were finally selected to measure the phase difference by the IQ demodulation method.2.Based on the research of key technologies of microwave high-precision remote displacement measurement system,the overall design of the system has been completed.Starting from the application scenarios and performance indicators of the system,major parameter selection and parameter verification were performed.Based on this,the structural design of the displacement measurement system was completed,including the main device structure design and the device structure design;the displacement measurement system was Performance analysis,including displacement resolution,phase unfolding processing,and crystal stability influence on displacement measurement,was finally verified by simulation.3.Developed a verification prototype of the displacement measurement system and conducted a field verification experimentBased on the key technology and overall scheme of microwave high-precision remote displacement measurement system,a prototype of the principle verification was developed and its performance was tested.Based on this,an outfield experiment program was formulated and an external field experiment was performed according to the steps.The effectiveness of the displacement measurement system and the displacement measurement performance of the system.