The Application Of InSAR Technology And Its Precision Analysis In DEM Construction

Digital Elevation Model(Digital Elevation Model),referred to as "DEM,is terrain Elevation attributes,in the form of a numerical array is a set of orderly ground Elevation,used to describe the attributes of the terrain surface morphology Digital expression Model,the Digital terrain Model(Digital Elevation Model,referred to as DTM)is a branch of,other kinds of terrain characteristic value can be derived therefrom.Therefore,DEM in surveying and mapping,hydrology,meteorology,geomorphology,geology,soil,engineering construction and the national economy and national defense construction,and humanities and natural science has a wide range of applications.Synthetic Aperture Radar Interferometry(InSAR,Synthetic Aperture Radar Interferometry)is a kind of Synthetic Aperture Radar is used to collect the phase information as the information source,the surface of the 3 d information and the change of information a earth observation technology.It first two antennas at the same time by synthetic aperture radar system(monorail)or two parallel observations(repeat mode),for the ground target area of the two SAR images,and then to interfere with the two SAR images get interference figure,finally use the plural images like the imaging geometry relationship,to convert the phase information for the elevation information,can obtain each resolution cell ground elevation,and then obtain the ground target area of digital elevation model.As compared with traditional measurement methods and InSAR technology has great potential in access to a wide range of DEM.In this paper,the Sentinel-1a satellite radar data as data sources,and the data processing and analysis,discusses in detail the InSAR technology for the core technology research in the process of digital elevation model.Papers in jiangchuan county and xingyun lake surrounding area as the study area,a Sentinel-1 satellite access data as data sources,through theoretical analysis,data processing,the experimental results and analysis,etc.,was studied by InSAR technology for the precision of DEM,it analyses the reasons of the InSAR technique to obtain DEM precision,the feasibility of InSAR technology for DEM are studied.To complete the paper in the process of the main work done is as follows:1.Detailed knowledge of the theory of synthetic aperture radar interferometry,a deep understanding of the principle of synthetic aperture radar interferometry technology.2.In understanding the basis of the principle of synthetic aperture radar interferometry,is given through the flow chart of InSAR technology for digital elevation model,and use the Sentinel-1 a satellite data,combined with secondary data generated the DEM of the study area.3.In the use of synthetic aperture radar interferometry technique in the process of generating DEM,mainstream interferogram filtering method is studied in detail.On the basis of coherence interference image after filtering,the comparison of the different adaptive filtering method.4.Several wrapped phase solution algorithms are studied in detail,and respectively treated with different methods of phase unwrapping bound the interference image,and the statistical analysis of wrapped phase image than the applicability of different phase unwrapping bound method.5.With high precision SRTM DEM data as the standard,to evaluate the accuracy of the experiment of DEM data.