Due to the presence of phase noise and temporal decorrelation, high-quality pixel selection has been an indispensable part in ground-based synthetic aperture radar (GB-SAR) interferometry. The main pixel selection methods are permanent scatterer (PS) methods and coherent scatterer methods. However, both of them cannot properly solve the false-selection and the miss-selection caused by intrinsic scattering and temporal characteristics of the pixel on the whole dataset. Pseudo-PS and quasi-PS are first introduced into the high-quality pixel selection of GB-SAR interferometry, and a temporal selection method (TSM) is proposed to avoid the miss-selection of quasi-PS. Then, in order to achieve appropriate pixel density and high-quality pixels for deformation monitoring, a high-quality interferometric pixel selection method based on pseudo- and quasi-permanent scatterers analyses is proposed, which is a joint processing technique combining spatial variant apodization with TSM. Finally, the effectiveness of the proposed high-quality pixel selection method is validated by the field measurements of GB-SAR data.
Near range microwave imaging systems have broad application prospects in the field of concealed weapon
detection, biomedical imaging, nondestructive testing, etc. In this paper, the techniques of MIMO and sparse line array
are applied to near range microwave imaging, which can greatly reduce the complexity of imaging systems. In detail, the
paper establishes two-dimensional near range MIMO imaging geometry and corresponding echo model, where the
imaging geometry is formed by arranging sparse antenna array in azimuth direction and transmitting broadband signals
in range direction; then, by analyzing the relationship between MIMO and convolution principle, the paper develops a
method of arranging sparse line array which can be equivalent to a full array; and the paper deduces the backprojection
algorithm applied to near ranging MIMO imaging geometry; finally, the imaging geometry and corresponding imaging
algorithm proposed in this paper are investigated and verified by means of theoretical analysis and numerical simulations.
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