Surface Reconstruction Using Thinned Random Arrays in mm-Wave FMCW SAR Imaging

Dennis Pohle, Jan Barowski, Jochen Jebramcik, Ilona Rolfes

European Microwave Conference (EURAD) 2017, pp. 303-306, doi: 10.23919/EURAD.2017.8249207, Nuremberg, Germany, October 11-13, 2017


In this paper the influence of a randomly thinned synthetic aperture on 3D surface reconstructions, utilizing a mm-wave radar at 240 GHz, is investigated. Using a uniformly sampled rectangular aperture of an adequate size, with regard to high cross-range resolutions, measurements can be very time consuming. This is due to the high operating frequencies, which make it necessary to shift the antenna in very small steps below one millimeter to fulfill the Nyquist sampling theorem. To overcome this problem, a non-uniform sampling approach using random measurement positions is suggested. Successively reducing the amount of positions in a random way causes noiselike artifacts, due to undersampling together with an overall degradation of the signal-to-noise ratio. In the following, the performance of the reconstruction under these conditions is examined in detail.

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