ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 2, pp. 42-51

Detection of bridges instability by means of SAR interferometry

L.N. Zakharova 1 , A.I. Zakharov 1 
1 V. A. Kotelnikov Institute of Radioengineering and Electronics RAS, Fryazino Branch, Fryazino, Russia
Accepted: 20.11.2017
DOI: 10.21046/2070-7401-2018-15-2-42-51
The paper focuses on remote sensing of bridges state, including estimation of displacements by means of radar interferometry technique. Ten bridges located in Russia and abroad were selected as test objects for our study. Results of processing Sentinel-1 radar data showed that there was strong decorrelation on the interferograms of four bridges which precludes the estimation of their stability by means of radar interferometry. Stability level of other six bridges of various types (suspension, truss, and girder ones) with lower temporal decorrelation was estimated and analyzed. It was discovered that two Volga River bridges were stable between observations, railway bridge in Murom demonstrated thermal dilation; two suspension bridges above sea straits near Istanbul and San Francisco showed moderate dynamics of explainable mechanical nature. For the Striginsky bridge over Oka River we discovered the possibility of phase measurements in a “ghost image”, which is an outcome of multi-bounce signal scattering from the bridge and water surface, and the results were in agreement with measurements over a standard single-bounce image of the bridge. We processed data acquired under warm/freeze conditions; also we considered a smooth/waved water surface state under bridges as an influential condition for the high multiple-bounce coherence.
Keywords: synthetic aperture radar, differential interferometry, displacement estimation, bridges
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