http://www.tu-ilmenau.de

Logo TU Ilmenau


Ansprechpartner

Prof. Dr. Giovanni Del Galdo

Telefon +49 3677 69-4281

E-Mail senden

Ihre Position

INHALTE

Univ.-Prof. Dr.-Ing. Giovanni Del Galdo

Head of EMS Group

Kontakt
Tel.:+49 3677 69-4280
Büro:Helmholtzbau, Room 2502
Adresse
Technische Universität Ilmenau
Fakultät für Elektrotechnik und Informationstechnik
Fachgebiet Elektronische Messtechnik und Signalverarbeitung
Postfach 100 565
98684 Ilmenau

Kurzbiografie

Giovanni Del Galdo studied telecommunications engineering at Politecnico di Milano. In 2007 he received his doctoral degree from Technische Universität Ilmenau on the topic of MIMO channel modeling for mobile communications. He then joined Fraunhofer Institute for Integrated Circuits IIS working on audio watermarking and parametric representations of spatial sound.

Since 2012 he leads a joint research group composed of a department at Fraunhofer IIS and, as a full professor, a chair at TU Ilmenau on the research area of wireless distribution systems and digital broadcasting.  Since 2016, the group has merged with the chair Electronic Measurements led by Prof. Reiner Thomä, giving birth to the Electronic Measurements and Signal Processing (EMS) group.

Since 2017 he is director of the Institute for Information Technology at TU Ilmenau and he leads the VDE-ITG Expert Group HF.2 on Radio Systems.

His current research interests include the analysis, modeling, and manipulation of multi-dimensional signals, over-the-air testing for terrestrial and satellite communication systems, and sparsity promoting reconstruction methods.

Publikationen
Anzahl der Treffer: 210
Erstellt: Fri, 30 Oct 2020 23:26:02 +0100 in 0.0555 sec


Bauer, Julia; Andrich, Carsten; Ihlow, Alexander; Beuster, Niclas; Del Galdo, Giovanni;
Characterization of GPS disciplined oscillators using a laboratory GNSS simulation testbed. - In: IEEE Xplore digital library. - New York, NY : IEEE, ISSN 2473-2001, (2020), insges. 4 S.

This paper introduces a testbed to characterize the performance of GPS disciplined oscillators using a GNSS signal simulator and a measurement system based on software-defined radios and digital signal processing that allows to examine the stability of up to four devices with sub-nanosecond precision, time-coherently for 1 PPS and 10 MHz signals, in a controllable laboratory environment with reproducible and adjustable GNSS signal settings over a long-term observation period. To demonstrate the effectiveness of this method, four devices of one specific low-cost GPSDO type available to the authors are characterized and compared in terms of their positional accuracy and their time and frequency stability in steady state and during stabilization.



https://doi.org/10.1109/IFCS-ISAF41089.2020.9234932
Andrich, Carsten; Engelhardt, Maximilian; Ihlow, Alexander; Beuster, Niclas; Del Galdo, Giovanni;
Measurement of drift and jitter of network synchronized distributed clocks. - In: IEEE Xplore digital library. - New York, NY : IEEE, ISSN 2473-2001, (2020), insges. 8 S.

We propose a measurement setup for simultaneous measurement of drift and jitter of network synchronized distributed clocks using only off-the-shelf components. A network interface card with hardware timestamping capability and a local GPS-synchronized PTP grandmaster combined with appropriate post-processing enable absolute time measurement with sub-microsecond accuracy. The setup is explained in detail and its use exemplified by a 34 day measurement campaign. By polling a selection of globally distributed, GPS-synchronized NTP servers, delay asymmetry measurements were enabled. A detailed analysis of results illustrates the time-variant statistical properties of the jitter.



https://doi.org/10.1109/IFCS-ISAF41089.2020.9234926
Andrich, Carsten; Engelhardt, Maximilian; Ihlow, Alexander; Beuster, Niclas; Del Galdo, Giovanni;
Stochastic modeling of short and long term clock skew. - In: IEEE Xplore digital library. - New York, NY : IEEE, ISSN 2473-2001, (2020), insges. 4 S.

Traditional black box clock skew models are either the power-law noise model or a more recent approach based on auto-regressive (AR) filters. Unfortunately, neither algorithm can accurately model short and long term skew due to limited degrees of freedom or stability constraints. We propose a novel model that employs the current AR algorithm recursively with appropriate pre- and post-processing to achieve numeric stability and accurate reproduction of short and long term effects. The model coefficients are derived from a measured skew signal, with the model output matching an exemplary original signal closely in terms of Allan variance and time-domain behavior.



https://doi.org/10.1109/IFCS-ISAF41089.2020.9234818
Bauer, Julia; Andrich, Carsten; Ihlow, Alexander; Beuster, Niclas; Del Galdo, Giovanni;
Characterizing GPS disciplined oscillators for distributed vehicle-to-X measurement applications. - In: IEEE Xplore digital library. - New York, NY : IEEE, ISSN 2473-2001, (2020), insges. 4 S.

In this paper, we analyze the reference signal stability of 1 PPS and 10 MHz signals provided by a low-cost GPS disciplined oscillator under application specific conditions using a comparable light-weight measurement system based on software defined radio and digital signal processing. In mobile measurement scenarios, GPS signal impairments are inevitable, due to obstacles such as buildings, street canyons, bridges, and tunnels. Therefore, we preliminarily characterize four GPSDOs under test in a stationary setup using controlled GPS reception loss to drive them into alternating operation modes, namely free-run, disciplined and holdover mode. Further, we conducted a more than 100 km real-world diversified test drive to characterize the performance of the particular GPSDO as realistically as possible for the intended use in mobile V2X measurements.



https://doi.org/10.1109/IFCS-ISAF41089.2020.9234915
Schmidt, Leander; Römer, Florian; Böttger, David; Leinenbach, Frank; Straß, Benjamin; Wolter, Bernd; Schricker, Klaus; Seibold, Marc; Bergmann, Jean Pierre; Del Galdo, Giovanni;
Acoustic process monitoring in laser beam welding. - In: Procedia CIRP. - Amsterdam [u.a.] : Elsevier, ISSN 2212-8271, Bd. 94 (2020), S. 763-768

Structure-borne acoustic emission (AE) measurement shows major advantages regarding quality assurance and process control in industrial applications. In this paper, laser beam welding of steel and aluminum was carried out under varying process parameters (welding speed, focal position) in order to provide data by means of structure-borne AE and simultaneously high-speed video recordings. The analysis is based on conventionally (e.g. filtering, autocorrelation, spectrograms) as well as machine learning methods (convolutional neural nets) and showed promising results with respect to the use of structure-borne AE for process monitoring using the example of spatter formation.



https://doi.org/10.1016/j.procir.2020.09.139
Schieler, Steffen; Schneider, Christian; Andrich, Carsten; Döbereiner, Michael; Luo, Jian; Schwind, Andreas; Thomä, Reiner; Del Galdo, Giovanni;
OFDM waveform for distributed radar sensing in automotive scenarios. - In: International journal of microwave and wireless technologies. - Cambridge : Cambridge Univ. Press, ISSN 1759-0795, Bd. 12 (2020), 8, S. 716-722

https://doi.org/10.1017/S1759078720000859
Semper, Sebastian; Döbereiner, Michael; Pawar, Sankalp; Landmann, Markus; Del Galdo, Giovanni;
eadf: representation of far-field antenna responses in Python. - In: SoftwareX. - Amsterdam [u.a.] : Elsevier, ISSN 2352-7110, Bd. 12 (2020), 100583, S. 1-6

https://doi.org/10.1016/j.softx.2020.100583
Bauer, Julia; Andrich, Carsten; Döbereiner, Michael; Schieler, Steffen; Myint, James; Ihlow, Alexander; Schneider, Christian; Thomä, Reiner; Del Galdo, Giovanni;
Measurement campaign with synchronized distributed receivers and mobile emitter at 3.75 GHz in urban scenarios. - In: IEEE Xplore digital library. - New York, NY : IEEE, ISSN 2473-2001, (2020), insges. 5 S.

https://doi.org/10.1109/VTC2020-Spring48590.2020.9128562
Schieler, Steffen; Döbereiner, Michael; Thomä, Reiner; Schneider, Christian; Luo, Jian; Del Galdo, Giovanni;
Performance of OFDMA resource scheduling in joint mobile radio and radar networks. - In: IEEE Xplore digital library. - New York, NY : IEEE, ISSN 2473-2001, (2020), insges. 5 S.

https://doi.org/10.23919/EuCAP48036.2020.9135864
Dupleich, Diego; Müller, Robert; Landmann, Markus; Luo, Jian; Del Galdo, Giovanni; Thomä, Reiner;
Multi-band characterization of propagation in industry scenarios. - In: IEEE Xplore digital library. - New York, NY : IEEE, ISSN 2473-2001, (2020), insges. 5 S.

https://doi.org/10.23919/EuCAP48036.2020.9135630