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Item type:Publication, Access status: without files , A review on six-port radar and its calibration techniques(2018-07-05); ; ; The Six-port network is known for its high phase resolution and is therefore an interesting candidate for precise displacement sensors. This work gives an overview of Six-port networks and implementation technologies. Furthermore, several state-of-The-Art calibration techniques are discussed, which are necessary to achieve accurate displacement measurements. The calibration techniques can be classified into four categories: calibration of baseband signals, I/Q domain calibration, phase linearization and detector linearization. Highest accuracy is obtained by a combination of two or more calibration steps.Publicationtype: Conference Paper117 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , A multilayer dual-band filter using dual-mode resonators with second harmonic suppression(2018-07-05); ; ; ; A multilayer dual-band dual-mode bandpass filter with widely spaced passbands and using two independent square loop resonators is proposed. For improved stopband characteristics, the spurious second harmonic passband of the low frequency resonator is suppressed. The passbands are centered around 3 GHz and 9.35 GHz for application in a dual-frequency maritime radar. The simulated and measured results show good agreement.Publicationtype: Conference Paper252 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Separation of GPS signals in FSR system(2018-07-05); ; ; ; An approach and algorithm are proposed for separating the useful signal from a moving cosmic target and the direct signal transmitted by GPS satellites, on the background of the receiver noise. The algorithms for separating the useful signal will be based on the principle of separation in speed of two GPS signal sequences, the first-with a satellite velocity (reference signal), the second-with the target velocity. We will evaluate their performance with computer calculation or simulation.Publicationtype: Conference Paper199 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Influence of train interior on train-onboard communication(2018-07-05); ; ; ; This paper investigates wireless transmission of data sets within a high-speed train and the influence of train interior on the same. For the examinations orthogonal frequency-division multiplexing (OFDM) is used. With respect to fire protection doors, seats and windows, this work gives a classification of train interior parts regarding the attenuation. The results support the generation of future research strategies for various train design types regarding wireless train-onboard communication and the Train Communication Network (TCN).Publicationtype: Conference Paper87 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , A low cost dual-band transmit-receive module for a commercial maritime radar with digital beamformingA dual-band transmit-receive module for a new commercial maritime radar with digital beamforming is presented. The module is realized in a low cost approach. It consists of two RF-stages, one at S-and one at X-band, and a shared IF-stage. The cost is kept low by using components of the shelf and a novel integration technique for low-cost circulator. The transmit-receive module exhibits a transmit power of 28.7 dBm in the S-band and of 29.7 dBm in the X-band. The system noise figure is 2.9 dB and 7.5 dB, respectively.Publicationtype: Conference Paper70 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Compact PCB delay line for six-port based instantaneous frequency measurement(2018-07-05); ; ; ; The six-port interferometer is well known for its high phase resolution and is therefor used in a wide range of applications like network analysis, displacement sensors and communication systems. In addition, six-port based instantaneous frequency measurement has recently emerged as a promising alternative for instrumentation of wireless resonant sensors, such as surface acoustic wave (SAW) resonators. This paper discusses the specific requirements and design criteria for a compact and cost-effective radio frequency printed circuit board delay line, which is a core component in the overall measurement system for instantaneous frequency measurement. Finally, a compact realization for the 2.4 GHz frequency band is shown and two different surface finishes, electroless nickel immersion gold as well as immersion silver, are experimentally compared.Publicationtype: Conference Paper114