Application Research On Synthetic Aperture Imaging Of Shallow Subsurface Ground Penetrating Radar

Ground-penetrating radar (GPR) as a new engineering geophysical detection technology,has the advantage of continuous, non-destructive, efficient and high-precision, its detectionprecision and the range resolution mainly depend on the bandwidth of the radar antenna. Withthe development of Ultra-Wideband (UWB) technology, shallow subsurface GPR adopt theUWB technology. GPR is always one of the researching hot spots in the world in these yearsand is widely used in all kinds of fields.Based on full understanding of existing GPR technology in this paper, I have studied themethod and application on synthetic aperture Imaging of Shallow Subsurface GroundPenetrating Radar. Analysis the principle and implementation process of and four kinds ofmigaration synthetic aperture Imaging, simulation experiments and measured data are carriedout to demonstrate the performance of synthetic aperture imaging technology, finally draw anconclusion that frequency-wavenumber migration imaging is more suitable for application toshallow ground penetrating radar.In this paper the author also make research on synthetic aperture imaging on the actualdetection environment situation that media wave velocity changes, introduce anothersynthetic aperture imaging method which is based on minimum entropy regularization offrequency wavenumber migration. Segment velocity model is proposed to process sub-partsynthetic aperture imaging of the image by different media, thus allow wave velocity changeat the detection line in the underground media, experiments are also carried out to invalidatethe method. The paper finally use the RIS-K2ultrawide GPR to apply the synthetic apertureimaging method to detect the rebar in the concrete floor, and the results show that the imageresolution is significantly imporved and more conducive for precise positioning of the rebar.