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An SiGe-chip-based 80 GHz FMCW-radar system with 25 GHz bandwidth for high resolution imaging

: Pohl, N.; Jaeschke, T.; Vogt, M.

Rohling, H. (Ed.) ; Deutsche Gesellschaft für Ortung und Navigation -DGON-:
International Radar Symposium, IRS 2013. Proceedings. Vol.1 : Dresden, Germany, June 19 - 21, 2013
Göttingen: Cuvillier, 2013
ISBN: 978-3-95404-223-4
International Radar Symposium (IRS) <14, 2013, Dresden>
Fraunhofer FHR

Existing 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.