Herschel, R.R.HerschelNowok, S.S.NowokWarok, P.P.WarokZimmermann, R.R.ZimmermannLang, S.A.S.A.LangPohl, N.N.Pohl2022-03-132022-03-132015https://publica.fraunhofer.de/handle/publica/39487310.1109/EuMC.2015.7345793A millimeter wave imaging system operating around 90 GHz with 7.5 GHz bandwidth is presented. 2D images with 20 mm resolution in range and 3.2° in azimuth are obtained with an 1×4 MIMO approach. The performance of receiver and transmitter modules driven by a Direct Digital Synthesizer is discussed. Experimental data on radar imaging between 1 and 4 m is shown and the used calibration is discussed in further detail. The system successfully achieves a dynamic range of more than 40 dB.enconference paper