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Influence of hypersonic turbulence in plasma sheath on synthetic aperture radar imaging.

Authors :
Li Jiangting
Gong Teng
Yang Shaofei
Guo Lixin
Cheng Mingjian
Source :
IET Microwaves, Antennas & Propagation (Wiley-Blackwell). 2017, Vol. 11 Issue 15, p2223-2227. 5p.
Publication Year :
2017

Abstract

On the basis of the fractal theory and measurements of hypersonic turbulence, the spectral index, and twodimensional (2D) power spectrum of the refractive index fluctuation are derived, and the 2D band-limited Weierstrass fractal function is applied to simulate the refractive index fluctuation in hypersonic turbulence. Thus, the impact of hypersonic turbulence on synthetic aperture radar (SAR) imaging system is simulated using the fractal phase screen method. Results show that the resolution of SAR imaging is severely deteriorated under the influence of hypersonic turbulence. The phase error caused by the turbulence microstructures in the plasma sheath becomes more apparent with the increase in the fractal dimension of the hypersonic turbulence. The larger Reynolds number associated with the hypersonic turbulence results in a more evident microstructure fluctuation and inferior imaging quality. Furthermore, when an aircraft flies at high speed, the azimuth focus is considerably sensitive to the turbulence microstructure along the direction of flow field. Consequently, hypersonic turbulence in the plasma sheath has a significantly larger effect on the azimuth than on the range in point-target imaging. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
17518725
Volume :
11
Issue :
15
Database :
Academic Search Index
Journal :
IET Microwaves, Antennas & Propagation (Wiley-Blackwell)
Publication Type :
Academic Journal
Accession number :
126938101
Full Text :
https://doi.org/10.1049/iet-map.2017.0303