A close link exists between FHR and the Institute for High frequency Physics (IHF) of RWTH Aachen through the professors of the two Fraunhofer FHR directors. The research group of Fraunhofer FHR is located in IHF. The testing and further development of radar-based sensors for different modes of transport is one of the focal points of the research group. The research group in Aachen is responsible for the project ATRIUM, in which a radar target simulator is being developed to simplify, above all, the validation of automotive radar sensors. The group also focuses on the new application fields of radar polarimetry. This enables the extraction of information on physical scattering mechanisms that occur on the radar target and remain concealed in the absence of polarimetric data collection. The research group in Aachen pursues the strategic goal of expanding the cooperation between IHF and Fraunhofer FHR and establishing a stronger network between the institutes of RWTH Aachen and the Fraunhofer-Gesellschaft. In its own HF laboratory, the group can measure and test radar sensors, also when using complex signal forms. Through the cooperation with IHF, the research group also has easier access to other infrastructure in the locality.