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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2023, Vol. 20, No. 2, pp. 49-59

Application of space-based SAR in single-pass squint mode in Earth tomographic study

M.I. Babokin 1 , P.E. Shimkin 2 
1 JSC Aerocon, Zhukovsky, Moscow Region, Russia
2 National Research University "Moscow Power Engineering Institute", Moscow, Russia
Accepted: 21.03.2023
DOI: 10.21046/2070-7401-2023-20-2-49-59
Construction features and main characteristics of a tomographic complex based on a single-position space radar with synthetic aperture radar (SAR) operating in the single-pass squint Earth observation mode are considered. The operating conditions and requirements for information support of the multichannel signal processing system are determined. The operability of the proposed approach using real signals of two wavelength ranges obtained during experimental flights was tested. The tomographic SAR (TSAR) under consideration makes it possible to perform a rapid four-dimensional assessment during one pass of the carrier, without using a second receiving antenna. The algorithmic implementation of paired signals multidimensional processing is described, the verification and debugging of which was carried out using real radio holograms. The feature of this TSAR construction is the possibility to use one increased synthesis interval, with a division into sub-intervals to enable spatial diversity of multi-pair receiving apertures, in the implementation of multi-dimensional phase-difference radar measurements. The possibility demonstrated to use the proposed construction design of the tomographic complex with SAR in solving tasks related to obtaining additional information on the state of the Earth’s surface. This paper presents the first experimental results of imaging the layered inhomogeneities of the underlying surface by using multidimensional phase-difference processing of paired signals from a single-pass SAR operating in squint mode.
Keywords: synthetic aperture radar (SAR), tomographic SAR, multidimensional signal processing, complex earth surface, experimental results
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