Title :
Millimeter-Wave Imaging With Optimized Sparse Periodic Array for Short-Range Applications
Author :
Gumbmann, F. ; Schmidt, L.
Author_Institution :
Dept. of Microwave Eng. & High-Freq. Technol., Univ. of Erlangen-Nuremberg, Erlangen, Germany
Abstract :
This paper presents a multiple-input-multiple-output imaging system on the basis of a hybrid concept with synthetic aperture radar and digital beam forming. By moving a multistatic linear array perpendicularly to the array dimension, a 2-D aperture is sampled. The scope of application is concealed weapon detection in conjunction with the imaging of humans and, alternatively, nondestructive testing (NDT). The frequency range of 75-90 GHz was chosen because of the inherent high lateral resolution. For NDT, it seems to be a good compromise between lateral resolution and penetration depth as well. A moderate number of transmit and receive channels are achieved by a sparse periodic array (SPA) design. Since this is a far-field approach, ambiguities are not well suppressed in the near-field point spread function of the sparse array. An extension of the SPA concept for short-range applications on the basis of an optimized array design and an optimized beamforming algorithm is presented in this paper.
Keywords :
MIMO radar; image resolution; military radar; millimetre wave imaging; nondestructive testing; radar imaging; radar receivers; radar resolution; radar transmitters; synthetic aperture radar; weapons; 2D aperture; SPA concept; digital beam forming; human imaging; inherent high lateral resolution; millimeter-wave imaging; multiple input multiple output imaging system; multistatic linear array; near field point spread function; nondestructive testing; optimized beamforming algorithm; optimized sparse periodic array dimension; receiving channel; synthetic aperture radar; transmitting channel; weapon detection; Apertures; Arrays; Image reconstruction; Imaging; Kernel; Receiving antennas; Transmitting antennas; Millimeter-wave (mmW) radar; multiple-input–multiple-output (MIMO) systems; synthetic aperture radar (SAR);
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
DOI :
10.1109/TGRS.2011.2164616