Pohl, N.N.PohlJaeschke, T.T.JaeschkeVogt, M.M.Vogt2022-03-122022-03-122013https://publica.fraunhofer.de/handle/publica/381365Existing SAR systems are often limited in resolution by their small bandwidth of below 10 GHz. In this contribution an ultra-wideband 80 GHz FMCW radar sensor for SAR imaging with 25.6 GHz bandwidth is presented. It is based on a custom low-power SiGe-MMIC including all high frequency components, using a nested PLL concept in combination with off-the-shelf PLL synthesizer ICs. In single direction radar measurments, a resolution of 8.09mm is shown. Additionally, results of SAR measurements with a point target show that a good spatial resolution of 12.0 mm × 8.1 mm (Tukey window, = 0.25, -6 dB width) is achieved. Furthermore, high resolution SAR images of a bike acquired with the sensor are presented.enconference paper