Adaptive millimeter-wave synthetic aperture imaging for compressive sampling of sparse scenes

Abstract

Abstract:We apply adaptive sensing techniques to the problem of locating sparse metallic scatterers using high-resolution, frequency modulated continuous wave W-band RADAR. Using a single detector, a frequency stepped source, and a lateral translation stage, inverse synthetic aperture RADAR reconstruction techniques are used to search for one or two wire scatterers within a specified range, while an adaptive algorithm determined successive sampling locations. The two-dimensional location of each scatterer is thereby identified with sub-wavelength accuracy in as few as 1/4 the number of lateral steps required for a simple raster scan. The implications of applying this approach to more complex scattering geometries are explored in light of the various assumptions made. 11. E. Lebed, P. J. Mackenzie, M. V. Sarunic, and F. M. Beg, "Rapid volumetric oct image acquisition using compressive sampling," Opt. Express 18, 21003-21012 (2010

Thorough approach toward cylindrical MMW image reconstruction using sparse antenna array

“…Moreover, in this paper, in order to improve the performance of the cylindrical MMW imaging system in terms of the total cost and image quality, a sparse multi-static 1D antenna array has been designed and implemented. There have been some previous efforts for implementing sparse MMW imaging systems [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In a group of works, compressive sensing theory has been utilised in order to reduce the number of required samples for obtaining an acceptable number of antennas [12][13][14][15][16].…”

“…This loss of data is compensated in adaptive image reconstruction algorithms. These methods maintain the information available in acquired data and do not need a priori knowledge about the specimen under test [17][18][19][20][21]. Still, the second shortcoming is the computational cost of the related optimisation algorithms, which is much greater than conventional image reconstruction methods.…”