Research On Fenwei Basin Surface Deformation Monitoring With Scan-InSAR Technology

The ScanSAR is a Synthetic Aperture Radar with a swath wider than that ofconventional SAR systems. This is achieved by scanning different subswaths. The useof WSM would reduce the revisit time to a few days due to the very large ScanSARswath. ScanSAR interferometry is an attractive option for efficient topographicmapping of large areas and for monitoring of large-scale motions. With meliorationand enhance of facility and orbit tecqnique of SAR satellite, scanning patternsynchronization and the critical baseline of precondition condition for scanningsynthetic aperture radar interferometry have been pledged, at the same time, manySAR satellites have been launehed or will be eradiated so that they can provide moreabundant data for WSInSAR. Therefore, ScanSAR interferometry offers an newpotential technology for studing plank movement and geodynamics.ScanSAR interferometry relative to the conventional mode interferencemeasurements, despite the lower resolution, but its coverage is generally3-5times thenormal mode. Under the interference conditions are good, the accuracy of ScanSARinterferometry monitoring can be obtained with conventional InSAR considerable,Using ScanSAR interferometry to obtain deformation field of wide area involve awider range of seismic deformation field monitoring studies as well as glaciers, floodsand other disasters has a very significant advantage of monitoring, so ScanSARinterferometry theory and methods has become a new research focus of the InSARtechnique.Although wide swath mode is one of modes of spaceborne SAR satellites, theirmodes are different, and imaging principle and proeess of interferometry also have alot of dissimilitudes such as coherence, coregistering, correction of atmosphere effects.In order to make use of ScanSAR data to get wider deformation field, theory and itsapplication of ScanSAR interferometry are studied, including the following contents:(1) The paper reviewed and summarized the domestic and foreign ScanSARtechnology development and its application in various fields. Based on this, The paper analyzed and discussed on the basis of the ScanSAR existing theory and applicationdifficulties.(2) The study discussed the basic theory of ScanSAR interferometry, including theimaging principle of the ScanSAR mode imaging parameters, and ScanSAR imagingof three commonly used algorithms and their respective advantages and disadvantagesand scope of application, and summarizes the ScanSAR mode and the correspondingparameters of the different satellites.(3) ScanSAR interferometry processing method and its error analysis. ScanSARinterferometry processes in conventional InSAR interferometry and sources of erroranalysis on the basis of ScanSAR interferometry various error sources and theirweakened measures were analyzed and discussed.(4) Using the ScanSAR interferometry to obtain the deformation field of the Bamearthquake, and were compared with the conventional InSAR, the two results are wellconsistent.(5) Studied ScanSAR interferometric techniques in the Fenwei basin deformationmonitoring applications. First attempt at the use of ScanSAR interferometry formonitoring slow deformation of a wide range. ScanSAR interferometry Enviast/ASAR wide-based data were studied. RAW and SLC data test, interference betterdifferential interferogram. The test has been more consistent with conventional InSARresults. Evaluated on the basis of a comparative analysis of results with conventionalInSAR results, the ScanSAR monitoring of accuracy.