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Inthis article an impulse based radar systemoperating in the ultra-wideband frequency range between 3.1 GHz and 10.6 GHz is presented. The radar sensor is intendedtobeused in medical diagnostics.Inprinciple the realized radar could be appliedtovarious applications, especially due to the compact overall size and the size of the radar front-ends in particular.One focus of the paper is on adetailed description of the system architecturewith the correlation receiver and the time delay adjustment using a variable phase setting for the trigger signals. Furthermore, the key components of the radar, the monolithically integrated pulse generator and the planar antenna, are explained.The capabilities of the radar and the correlation principle are shown in different validation measurements, where ametal plate is used as an ideal target. In addition, two different methods for movement detection were demonstrated successfully measuring the respiration and the heart beat of atest person.

Abstract-Using a series-model of an automotive short range radar sensor (SRR) and a recently completed experimental radar system, field tests have been performed in a surface mine. It was examined, to what extent low-cost electronically scanning radar sensors can provide useful data for assistance systems in large scale mining machines. The series SRR sensor using mono-pulse principles for cross range measurement, proved to be useful to supervise the safety zone of a bucket wheel excavator. The more complex and sophisticated experimental radar system using digital beam-forming for cross range processing, can clearly detect and map the contours of trenches and escarpments. The overall promising results refer to many more potential applications for electronically scanning radar in surface mining and motivate to adapt the experimental sensor for such applications.Index Terms-Electronically scanning radar, digital beamforming, surface mining applications.

Architecture, design, assembly and performance data of a 38 GHz radiometer are presented in this article. The radiometer is intended to serve as a demonstrator in microwave system education and as a platform to demonstrate novel RF structures and design techniques. Among other components, it includes a folded planar reflect array antenna, a mechanically sealed transition from circular waveguide to microstrip and several monolithic microwave integrated circuits (MMIC). With an internal reference and various analog and digital compensation circuits, the radiometer is able to measure absolute noise temperatures within a considerable operating temperature range. Adjustable data integration parameters allow the radiometer to be used for many different scenarios. The overall performance of the radiometer is verified by system measurements and some exemplary field tests. ÜbersichtIn diesem Artikel werden Architektur, Entwicklung und Aufbau eines Radiometers bei einer Frequenz von 38 GHz beschrieben. Das Radiometer stellt sowohl ein Demonstrationsobjekt in der Lehre als auch eine Experimentierplattform für neue Hochfrequenzstrukturen und Entwurfstechniken dar. Es enthält unter anderem eine gefaltete planare Reflektorantenne, einen mechanisch dichten Übergang von Rundhohlleiter auf Mikrostreifenleitung und verschiedene MMIC-basierte Millimeterwellen-und Hochfrequenzschaltungen. Da das Radiometer über eine interne Referenz und verschiedene analoge und digitale Kompensationsnetzwerke verfügt, ist die Messung von absoluten Rauschtemperaturen innerhalb eines beträchtlichen Gerätetemperaturbereichs möglich. Über einen weiten Wertebereich einstellbare Integrationszeiten erlauben es, das Gerät für verschiedene Meßszenarien zu verwenden. Die Leistungsdaten des aufgebauten Radiometers wurden durch die Ergebnisse von Systemmessungen und durch beispielhafte Feldtests verifiziert.