1. Millimetre Wave Radar and High Frequency Sensors, Fraunhofer Institute for High Frequency Physics and Radar Techniques FHR, 53343 Wachtberg, Germany
2. Sensor Data and Information Fusion, Fraunhofer Institute for Communication, Information Processing and Ergonomics FKIE, 53343 Wachtberg, Germany
3. High Frequency Devices and Circuits, Fraunhofer Institute for Solid State Physics IAF, 79108 Freiburg, Germany