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PALSAR-2 on ALOS-2 developed by JAXA, is a follow-on L-band SAR sensor from PALSAR on ALOS. The mission objectives defined by JAXA include contribution to disaster monitoring. To establish the methodology to acquire the damaged area for disaster monitoring, we need to improve our understanding of the relationships between the sensor parameters (e.g., coherence and errors of the interferogram) and...
The launch of Sentinel-1 constellation raise a new era for InSAR applications and time series analysis. The wide coverage, fine temporal and spatial resolution, precise control of orbits and the free distribution policy bring more new chances than ever to earth observations applications. In this experiment we use Sentinel-1A data that covers a period of one year and a half (from November 2014 to June...
Interferometric Synthetic Aperture Radar (InSAR) methods provide high resolution maps of surface deformation applicable to many scientific, engineering and management studies. Modern spaceborne satellites provide long sequences of observations that we can reduce to many interferograms, which in turn provide the deformation histories of many points on the surface. Here we show how raw radar data, or...
In this paper, we propose a model-based procedure to estimate the accuracy of Sentinel-1 orbit products by the Multi-Squint (MS) phase. The technique exploits the results of single baseline MS analyses collected for each possible master and slave combination in a stack to estimate the absolute orbit error. Accordingly, as first step we state the geometric model of the InSAR phase and the MS phase...
The accuracy of InSAR baseline measurement or estimation is the key factor of digital elevation model (DEM) generation. A new method of baseline estimation about Newton iteration method was presented in terms of the principle of SAR interferometry. The issue of baseline computation can be examined using the ERS-1/2 C wavelength single look complex (SLC) of April 15 and 16 in 1996, Its validity is...
Interferometric baseline plays a very important role in InSAR data processing, and it will directly affect the accuracy of interferometric result. In this article, three classical baseline estimation methods were described. By comparing and combining three methods, a new baseline estimation method and its flow were listed. RADARSAT-2 satellite image data and grid digital elevation model ASTER GDEM...
A tropospheric correction method for Interferometric Synthetic Aperture Radar (InSAR) was developed using profiles from the European Centre for Medium-Range Weather Forecasts (ECMWF) and Zenith Total Delay (ZTD) from the Global Positioning System (GPS). The ECMWF data were interpolated into a finer grid with the Stretched Boundary Layer Model (SBLM) using a Digital Elevation Model (DEM) with a horizontal...
Spaceborne INSAR (Interferometric Synthetic Aperture Radar) is an important remote sensing tool for topographic mapping, while there are inevitably shadow areas in Radar images. Shadow area has no radar echo signal or low coherence SNR (signal noise ratio). In this paper, Shadow area percentage estimation according to Radar look angle is proposed. Digital elevation model of natural terrains and ascending...
In view of the character of mining disaster and the limitation of traditional methods of earth surface deformation monitoring in western mining area, an attempt at adopting InSAR techniques in dynamic deformation monitoring in west mining area has been developed. This paper takes Shaanxi Province Binchang mining area as study area, processes the SAR image by differential interference, obtains the...
In this paper, we apply the Advanced Land Observing Satellite (ALOS) PALSAR data to study the urban subsidence condition in Shanghai, China. The baseline condition, troposphere delay, DEM accuracy mainly limit the capability of PALSAR interferometry, and the influences are evaluated. Six interferograms are analysed in this research, based on D-InSAR technology. We introduce a polynomial to fit the...
In this paper, we analyse the issue of SAR image co-registration for wide-swath and high-resolution spaceborne InSAR. A solution to this problem is proposed in which three processing procedures are adopted. First, image co-registration pre-processing is performed. There are two methods for this step: one is based on InSAR orbit and radar system parameters, and the other is based on the cross-correlation...
In this paper, an novel method for interferometric synthetic aperture radar (InSAR) image registration is proposed. The approach is more accurate than conventional methods since it uses a continuous interpolation technique. The approach gets rid of the limitation of restricted registration accuracy caused by discrete interpolation. The performances of the proposed method are shown by using simulated...
The `baseline' is one of the most important parameters in Interferometric Synthetic Aperture Radar (InSAR). The quality of InSAR products is significantly affected by the accuracy of baseline estimation. In this paper, a new approach to improving the baseline estimation is proposed. The main advantage of estimating baseline by the proposed method is that the calculation can be performed without the...
Baseline is an important parameter of the process of InSAR (interferometric synthetic aperture radar), which directly influences the accuracy of the ultimate DEM generated. In this paper, firstly, the relationship between positioning and deformation measure accuracy and baseline error was analyzed. Secondly, three classical baseline estimation methods, which are the method based on precise orbit data,...
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