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Multichannel synthetic aperture radar (SAR)
in azimuth can resolve the contradiction between high resolution and wide swath
faced with traditional SAR imaging. However, channel errors will degrade the
performance of imaging. This paper compares the performances of four channel error
estimation algorithms under different clutter distributions and SNR conditions.
Further, explanations are given for performance differences of the four
algorithms, which provide evidence for method selection in engineering applications.
The geometrical structure of ferromagnetic FeO is optimized. Its electric and magnetic properties
such as the half-metallicity, the conductivity and the magnetic moment distribution are investigated
by performing first-principles calculations within the generalized gradient approximation
for the exchange-correlation function based on density functional theory. Results show that ferromagnetic
FeO has 100% spin-polarization at the Fermi level. Its supercell magnetic moments
are 32.00 μB, which arise mainly from 3d-orbits of Fe-ions. The electronic structures of Fe-ions are Fe2+t2g3↑eg2↑t*2g1↓.