Analysis of inverse synthetic aperture radar imaging in the presence of time-varying plasma sheath |
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Affiliation: | School of Aerospace Science and Technology, Xidian University, Xi'an 710071, People's Republic of
China |
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Abstract: | The plasma sheath can induce radar signal modulation, causing not only ineffective target
detection, but also defocusing in inverse synthetic aperture radar (ISAR) imaging. In this paper,
through establishing radar echo models of the reentry object enveloped with time-varying plasma
sheath, we simulated the defocusing of ISAR images in typical environment. Simulation results
suggested that the ISAR defocusing is caused by false scatterings, upon which the false
scatterings’ formation mechanism and distribution property are analyzed and studied. The range
of false scattering correlates with the electron density fluctuation frequency. The combined value
of the electron density fluctuation and the pulse repetition frequency jointly determines the
Doppler of false scattering. Two measurement metrics including peak signal-to-noise ratio and
structural similarity are used to evaluate the influence of ISAR imaging |
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Keywords: | ISAR imaging plasma sheath time-varying transmission line matrix defocusing |
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