The Experts below are selected from a list of 2997 Experts worldwide ranked by ideXlab platform
Klaus Dostert - One of the best experts on this subject based on the ideXlab platform.
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channel measurements and simulations with planar inverted f Antennas in an enhanced testbed for a wireless battery management system
Smart Antennas (WSA 2015); Proceedings of the 19th International ITG Workshop on, 2015Co-Authors: Damián Alonso, Oliver Opalko, Klaus DostertAbstract:Under the project IntLiIon, we are investigating a wireless data transmission alternative for the Battery Management System of electrical and hybrid vehicles. In our previous work, we introduced the testbed and battery emulator employed for the first radio channel measurements. In this work, we present an enhanced version of this testbed. The connection method between Antenna, Cable, and battery emulator was changed to avoid the influence of the feed Cables in the measurements, allowing more accurate channel measurements. Additionally, we have developed simulation models of the PIFA Antennas and the environment. We validated the new testbed as well as the channel transfer function between Antennas (point-topoint and point-to-multipoint links) in different positions inside the battery emulator by means of measurements and simulations, showing a good agreement.
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WSA - Channel Measurements and Simulations with Planar Inverted F-Antennas in an Enhanced Testbed for a Wireless Battery Management System
2015Co-Authors: Damián Alonso, Oliver Opalko, Klaus DostertAbstract:Under the project IntLiIon, we are investigating a wireless data transmission alternative for the Battery Management System of electrical and hybrid vehicles. In our previous work, we introduced the testbed and battery emulator employed for the first radio channel measurements. In this work, we present an enhanced version of this testbed. The connection method between Antenna, Cable, and battery emulator was changed to avoid the influence of the feed Cables in the measurements, allowing more accurate channel measurements. Additionally, we have developed simulation models of the PIFA Antennas and the environment. We validated the new testbed as well as the channel transfer function between Antennas (point-topoint and point-to-multipoint links) in different positions inside the battery emulator by means of measurements and simulations, showing a good agreement.
P Russer - One of the best experts on this subject based on the ideXlab platform.
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ultra fast broadband emi measurement in time domain using fft and periodogram
International Symposium on Electromagnetic Compatibility, 2002Co-Authors: Florian Krug, P RusserAbstract:A novel ultra-fast, broadband time domain EMI measurement system is described Measurements were performed in the 30-1000 MHz range. The signals from the Antenna are digitized and processed by a computer in order to obtain fast-Fourier transform (FFT) as well as Welch and Bartlett periodograms. Correction of errors originating from the frequency characteristics of Antenna, Cable and oscilloscope is made by digital signal processing. With the presented time domain measurement system the measurement time can be reduced by a factor of 10. The results obtained with the described system have been compared with measurements performed with a conventional EMI receiver. Over the whole frequency range from 30 to 1000 MHz the deviations have been below 3 dB.
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ultra fast broadband emi measurement in time domain using classical spectral estimation
International Microwave Symposium, 2002Co-Authors: Florian Krug, P RusserAbstract:In this paper, a novel ultra-fast, broadband time domain EMI measurement system is described. Measurements were performed in the 30-1000 MHz range. The signals from the Antenna are digitized and processed by computer in order to obtain Fast-Fourier Transform (FFT) as well as Welch and Bartlett Periodograms. Correction of errors originating from the frequency characteristics of Antenna, Cable and oscilloscope is made by digital signal processing. With the presented time domain measurement system, the measurement time can be reduced by a factor of 10. The results obtained with the described system have been compared with measurements performed with a conventional EMI receiver. Over the whole frequency range from 30 to 1000 MHz the deviations have been below 3 dB.
J. Delporte - One of the best experts on this subject based on the ideXlab platform.
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Absolute calibration of timing receiver chains at the nanosecond uncertainty level for GNSS time scales monitoring
Metrologia, 2020Co-Authors: David Valat, J. DelporteAbstract:The use of Global Navigation Satellite Systems (GNSS) for time transfer is widespread, in particular for the computation of the Coordinated Universal Time (UTC). It is an inexpensive, easy-to-implement method to compare distant clocks. This time transfer method can also be applied to the monitoring of the GNSS time scales and of the broadcast UTC conversion parameters. One mission of the French space agency (CNES) is to perform this task for Galileo. For that purpose it is mandatory to carry out an absolute calibration of the propagation delay of a GNSS receiver chain. This propagation delay is the one between the GNSS Antenna phase centre and the time reference that feeds the receiver chain. In order to allow a link to UTC, the time reference must be a UTC(k). CNES has developed a method of absolute calibration of GNSS receiver chains, in which the delays of the GNSS Antenna, the Antenna Cable and the GNSS receiver are determined separately, with a total uncertainty in the range of 1 ns (1-σ). The purpose of this paper is to present the method developed by CNES along with its uncertainty budget for GPS, Galileo and BeiDou signals. A validation in common-clock with actual GPS and Galileo signals is also provided. The absolute calibration is finally applied to an accurate monitoring of the GNSS time scales, the Galileo broadcast UTC conversion parameters and the broadcast Galileo to GPS time offset (GGTO), with associated uncertainties.
T. Y. Otoshi - One of the best experts on this subject based on the ideXlab platform.
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Simulation diagnostics of multiple discontinuities in a microwave coaxial transmission line
IEEE Transactions on Microwave Theory and Techniques, 1995Co-Authors: T. Y. OtoshiAbstract:Multiple discontinuities in microwave transmission lines can cause unusual reflection and transmission loss characteristics as functions of frequency. This article presents a method for developing models that simulate return loss and insertion loss data measured over a broad band of frequencies. The overall Cable is modeled as a coaxial transmission line consisting of shunt susceptance discontinuities separated by line lengths. A nonlinear least-squares fit is then performed between theoretical data (from the model) and experimental data. When this method was applied to modeling discontinuities in a slightly damaged S-band Antenna Cable, excellent agreement between theory and experiment was obtained over a frequency range of 1.70-2.85 GHz. >
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A method for modeling discontinuities in a microwave coaxial transmission line
Proceedings of IEEE National Telesystems Conference - NTC '94, 1Co-Authors: T. Y. OtoshiAbstract:A methodology for modeling discontinuities in a coaxial transmission line is presented. The method uses a non-linear least squares fit program to optimize the fit between a theoretical model and experimental data. When the method was applied for modeling discontinuities in a damaged S-band Antenna Cable, excellent agreement was obtained. >
Damián Alonso - One of the best experts on this subject based on the ideXlab platform.
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channel measurements and simulations with planar inverted f Antennas in an enhanced testbed for a wireless battery management system
Smart Antennas (WSA 2015); Proceedings of the 19th International ITG Workshop on, 2015Co-Authors: Damián Alonso, Oliver Opalko, Klaus DostertAbstract:Under the project IntLiIon, we are investigating a wireless data transmission alternative for the Battery Management System of electrical and hybrid vehicles. In our previous work, we introduced the testbed and battery emulator employed for the first radio channel measurements. In this work, we present an enhanced version of this testbed. The connection method between Antenna, Cable, and battery emulator was changed to avoid the influence of the feed Cables in the measurements, allowing more accurate channel measurements. Additionally, we have developed simulation models of the PIFA Antennas and the environment. We validated the new testbed as well as the channel transfer function between Antennas (point-topoint and point-to-multipoint links) in different positions inside the battery emulator by means of measurements and simulations, showing a good agreement.
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WSA - Channel Measurements and Simulations with Planar Inverted F-Antennas in an Enhanced Testbed for a Wireless Battery Management System
2015Co-Authors: Damián Alonso, Oliver Opalko, Klaus DostertAbstract:Under the project IntLiIon, we are investigating a wireless data transmission alternative for the Battery Management System of electrical and hybrid vehicles. In our previous work, we introduced the testbed and battery emulator employed for the first radio channel measurements. In this work, we present an enhanced version of this testbed. The connection method between Antenna, Cable, and battery emulator was changed to avoid the influence of the feed Cables in the measurements, allowing more accurate channel measurements. Additionally, we have developed simulation models of the PIFA Antennas and the environment. We validated the new testbed as well as the channel transfer function between Antennas (point-topoint and point-to-multipoint links) in different positions inside the battery emulator by means of measurements and simulations, showing a good agreement.