TY - JOUR
U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1 - Shrena, Ismail
A1 - Eisele, David
A1 - Bardong, Jochen
A1 - Mayer, Elena
A1 - Reindl, Leonhard Michael
T1 - High-precision signal processing algorithm to evaluate SAW properties as a function of temperature
JF - IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
N2 - This paper presents a signal processing algorithm which accurately evaluates the SAW properties of a substrate as functions of temperature. The investigated acoustic properties are group velocity, phase velocity, propagation loss, and coupling coefficient. With several measurements carried out at different temperatures, we obtain the temperature dependency of the SAW properties. The analysis algorithm starts by reading the transfer functions of short and long delay lines. The analysis algorithm determines the center frequency of the delay lines and obtains the delay time difference between the short and long delay lines. The extracted parameters are then used to calculate the acoustic properties of the SAW material. To validate the algorithm, its accuracy is studied by determining the error in the calculating delay time difference, center frequency, and group velocity.
KW - Signaltechnik
KW - Verfahrenstechnik
KW - Akustische Oberflächenwelle
Y1 - 2013
SN - 0885-3010
DO - https://dx.doi.org/10.1109/TUFFC.2013.2629
VL - 60
IS - 4
SP - 805
EP - 813
ER -
TY - JOUR
U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1 - Pany, Thomas
A1 - Falk, Nico
A1 - Riedl, Bernhard
A1 - Stöber, Carsten
A1 - Winkel, Jón O.
A1 - Schimpl, Franz-Josef
T1 - Innovation: Under Cover: Synthetic-Aperture GNSS Signal Processing
JF - GPS World
N2 - Researchers are developing new GNSS receivers and antennas based on an innovative signal-processing scheme to significantly improve GNSS tracking reliability and accuracy under degraded signal conditions. It is based on the principles of synthetic-aperture radar. Like in a multi-antenna phased array receiver, GNSS signals from different spatial locations are combined coherently forming an optimized synthetic antenna-gain pattern. The method is implemented in a real-time PC-based software receiver and works with GPS, GLONASS, and Galileo signals. Multiple frequencies are generally supported. The idea of synthetic-aperture processing is realized as a coherent summation of correlation values of each satellite over the so-called beamforming interval. Each correlation value is multiplied with a phase factor. For example, the phase factor can be chosen to compensate for the relative antenna motion over the beam-forming interval and the resulting sum of the scaled correlation values represents a coherent correlation value maximizing the line of sight signal power.
KW - GNSS
KW - Signaltechnik
KW - Apertur
Y1 - 2013
UR - https://www.gpsworld.com/innovation-under-cover-synthetic-aperture-gnss-signal-processing/
UR - https://www.researchgate.net/publication/270285468_Innovation_Under_Cover_Synthetic-Aperture_GNSS_Signal_Processing
SN - 1048-5104
VL - 24
IS - 9
SP - 42
EP - 50
ER -