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Study of artificial and natural PSs in the area Bear Lakes calibration site

Alexander Zakharov(1) and Peter Zherdev(2)

(1) IRE RAS, Vvedensky square 1, 141190, Russian Federation
(2) Special Design Bureau of MPEI, Krasnokazarmennaya street, 14, 111250 Moscow, Russian Federation


The goal of the report is an analysis of the behavior of artificial and natural permanent scatterers in the area of Bear Lakes calibration site using ERS SAR and (very likely) ENVISAT ASAR data under our AO3-343 project. The area of study is calibration site in Moscow region with parabolic antennas (4.8 meters diameter of the dish), which were used over 5 years as calibration targets as well as the Moscow city territory. Our previous analysis of amplitude data has shown very high stability of RCS for both artificial (antennas) and natural (surface structures, urban constructions) targets. New stage of current study is focussed on phase stability of the scatterers mentioned. Of highest importance is the fact obtained from INSAR studies that such a large ground based calibration target as antenna does possess high phase stability (one tenth of the wavelength) in spite of the fact it is affected by pointing errors in every calibration session because of inaccurate predicted ephemeris and errors in the antenna settings. The same stability though in lower extent is specific to natural permanent targets. Among the other tasks is detection of landslides/subsidence because of technogenic processes to be solved using DINSAR technique. Having extended set of ERS SAR data including archival scenes since 1992 we can monitor the stability of the surface in the urban area of Moscow city on the decade time interval. Our preliminary analysis of the ERS DINSAR data shows evidence of the subsidences at the level of wavelength on some restricted areas on the south-eastern side of the city territory. We foresee an increase of our observation results with coming ENVISAT ASAR data both in the sense of radiometric calibration and phase calibration studies.


Full paper

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry