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Item type:Publication, Access status: without files , Diode detector design for 61 GHz substrate integrated waveguide Six-Port radar systems(2015-01); ; ; ; Radar sensors play a key role in today's industrial automation. Besides high accuracy, modern radar sensors have to feature high precision as well as challenging update rates. Six-Port wave correlators enable high phase resolution at high frequencies and therefore a high accuracy in radar applications. A low-cost Schottky diode detector applied to a substrate integrated waveguide (SIW) Six-Port is presented and measured. Furthermore, a displacement measurement using the SIW structure is performed.Publicationtype: Conference Paper207 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Low-weight wireless sensor network for encounter detection of bats(2015-01); ; ; ; In this paper a compact low weight wireless sensor node for proximity detection is presented. The energy-efficient system design enables an operation time of more than 9 days at a total weight of the tag of less than 2 g. Test measurements in a colony of bats proof the applicability of the system for encounter detection of individual bats based on received signal strength measurements.Publicationtype: Conference Paper65 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Combined localization and data transmission in energy-constrained wireless sensor networksMany applications demand simultaneous localization and aggregation in wireless sensor networks. For such an application, e.g. wildlife monitoring, a signaling scheme for a combined localization and communication using a common set of subcarriers is proposed. The concept is based on binary offset carrier signals. But, in contrast to Global Navigation Satellite Systems the presented approach makes use of pure subcarrier localization, and thus enables data transmission in short burst signals. The ranging performance is assessed utilizing the Cramér-Rao Lower Bound depending on the amount of data transferred and considering bit errors.Publicationtype: Conference Paper148 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , ADC depending limitations for Six-Port based distance measurement systems(2015-01); ; ; ; This publication will show some considerations for selecting an appropriate analog-digital-converter (ADC) in Six-Port based radar systems for distance measurements. It will be discussed how the ADC resolution is limiting the overall system range resolution. Furthermore, configurations with non-synchronous sampling of the four baseband signals and their influences on the system performance will be investigated.Publicationtype: Conference Paper79 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Underwater interferometric radar sensor for distance and vibration measurementWith the growing application of autonomous underwater vehicles (AUV) and underwater construction, i.e. robotic manipulator and maintenance systems, there is an increasing demand on precise underwater distance sensors. In this paper we present a low-cost, short-range and contactless sensor which uses electromagnetical (EM) waves for measuring distances underwater. The measurement system is based on interferometric radar applying a six-port interferometer and using EM waves at a frequency of 2.4 GHz. Measurement series in fresh water have been carried out showing an precision of below 100μm up to a distance of 35mm with only 8dBm of transmit power. Due to the high measurement rate the system can also be employed for vibration analysis. Additionally, by connecting a commercial 2.4 GHz data transceiver, it is imaginable for the system to be simultaneously used for high data rate communication between, e.g. AUV and unmanned underwater platforms (UUP).Publicationtype: Conference Paper219 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , 100 GHz reflectometer for sensitivity analysis of MEMS sensors comprising an intermediate frequency Six-port receiver(2015-01); ; ; ; Due to the growing market for Micro Electro Mechanical Systems (MEMS), especially for the application in mobile electronic devices like cameras, phones or tablet computers, cost and time efficient test and evaluation systems are required for the production process. This work presents a novel measurement setup for MEMS microphones, that allows an inline, contactless evaluation of the microphones' mechanical sensitivity at an early stage of the manufacturing process. A heterodyne receiver with a Six-port demodulator is deployed for displacement detection with micrometer resolution. Since the Six-port demodulator allows very high sampling rates, only limited by the analog-to-digital converter, short measurement times can be achieved.Publicationtype: Conference Paper170