Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 5, pp. 103-112
A study of accuracy of single-pass interferometric synthetic aperture radar with front-side view for measuring the Earth’s surface
P.E. Shimkin
1 , M.I. Babokin
2 , A.I. Baskakov
1 1 National Research University "MPEI", Moscow, Russia
2 JSC Aerocon, Zhukovsky, Russia
Accepted: 01.06.2017
DOI: 10.21046/2070-7401-2017-14-5-103-112
This work is devoted to the study of real accuracy of surface topography measurement with the help of single-pass interferometric system of Earth Remote Sensing (ERS) by example of an airborne synthetic aperture radar (SAR). The interferometric SAR (InSAR), which is concerned in this work, allows operational evaluation of the terrain in one pass of the SAR carrier without employment of the second receiving antenna. Algorithmic implementation of interferometric signal processing is described, its verification and debugging are carried out by real SAR raw data, which are recorded onboard of an aircraft during test flights. The feature of interferometric processing in this InSAR design is the possibility to use one enlarged synthetic aperture interval splitted into subintervals for the organization of interferometric measurements. Due to this approach there is a possibility to vary the interferometer base during digital signal processing. It allows to obtain information on the accuracy of terrain measurements depending on interferometer base and choose an optimal baseline with minimum root-mean square error of the terrain by studying the correlation coefficient of a pair of single look complex (SLC) images. Visual comparison of the obtained terrain 3D-images with the data from Google Earth is performed. The applicability of the proposed single-pass InSAR design in obtaining digital terrain models is demonstrated.
Keywords: single-pass interferometric SAR, correlation coefficient, digital terrain model, three-dimensional image
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