Short Range Imaging with Optimized Sparse Array

Conference: EUSAR 2010 - 8th European Conference on Synthetic Aperture Radar
06/07/2010 - 06/10/2010 at Aachen, Germany

Proceedings: EUSAR 2010

Pages: 4Language: englishTyp: PDF

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Gumbmann, Frank; Schmidt, Lorenz-Peter (University of Erlangen-Nuremberg, Institute for Microwave Technology, (LHFT), Cauerstr. 9, 91058 Erlangen, Germany)

This paper presents a MIMO imaging system on the basis of a hybrid concept with synthetic aperture radar (SAR) and digital beam forming (DBF). By moving a multistatic linear array perpendicular to the array dimension a two dimensional aperture is sampled. The scope of application is the field of non destructive testing (NDT) and security systems. Thus the frequency range 75-90 GHz seems to be a good compromise between lateral resolution and penetration depth. A moderate number of transmit and receive channels is 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. Therefore an optimized array was developed as well as a post processing algorithm on the basis of a notch filter. This notch filter is applied to attenuate the main part of the ambiguous energy in the doppler spectrum. Results are demonstrated with simulated and measured data.