Phase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band
Autor: | Wu Shiyou, Shen Zheng, Liu Xiaojun, Fang Guangyou, Guan Yang, Chao Li |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Point spread function
Physics Synthetic aperture radar Correctness Image quality Science MIMO Bistatic radar multiple-input-multiple-output synthetic aperture radar terahertz band Reflection (physics) General Earth and Planetary Sciences Wavenumber sidelobe suppression algorithm Algorithm phase shift migration |
Zdroj: | Remote Sensing Volume 13 Issue 22 Pages: 4701 Remote Sensing, Vol 13, Iss 4701, p 4701 (2021) |
ISSN: | 2072-4292 |
DOI: | 10.3390/rs13224701 |
Popis: | In multiple-input-multiple-output synthetic aperture radar (MIMO-SAR) systems, sparse arrays are usually applied, resulting in increased sidelobes of the point spread function. In this paper, a phase shift migration (PSM) imaging algorithm based on the explosion reflection model with modified coherent factor was proposed for sidelobe suppression in MIMO-SAR three-dimensional (3D) imaging application. By defining the virtual difference wavenumber, reconstructing the raw echo by data rearrangement in wavenumber domain, the original coherent factor algorithm operating in spatial domain can be achieved by the PSM algorithm frame in the wavenumber domain, which means two orders of magnitude increase in computational efficiency. The correctness of the theory is verified by simulation. Finally, a bistatic prototype imaging system in the 0.3 THz band was designed for the proof-of-principle experiments. The experimental results show that the proposed algorithm has a 0.948 structural similarity value to the original coherent factor back-projection algorithm (CF-BPA) which means comparable image quality with much superior efficiency. |
Databáze: | OpenAIRE |
Externí odkaz: | |
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