Contact
Christina Bonfert uni-ulm.de
Albert-Einstein-Allee 41
89081 Ulm
room 41.1.209
Tel.: +49 (0)731 50-26352
Vita
Christina Bonfert (maiden name: Christina Knill) received the B.Sc and M.Sc. degrees in electrical engineering from Ulm University in 2013 and 2015, respectively.
In 2015, she joined the Insitute of Microwave Engineering as an research assistant with research focus on radar signal processing for digital radars with OFDM modulation. She received her doctorate in 2022 with the thesis about "Novel MIMO OFDM waveform designs and high-performance signal processing methods for digital radars"→
Since 2022, she is a postdoctoral research fellow at the institute with research focus on radar signal processing and compressed sensing for UAV-based SAR.
Research
- radar signal processing
- novel modulation and multiplexing approaches for digital radars with focus on OFDM and code modulation
- compressed sensing for radar
- signal processing for UAV-based high-resolution SAR
- compressed sensing applied to SAR
Publications
2024
30.
J. Aguilar,
D. Werbunat,
V. Janoudi,
C. Bonfert and
C. Waldschmidt,
"Uncoupled Digital Radars Creating a Coherent Sensor Network",
IEEE Journal of Microwaves,
pp. 1-14,
Jun.
2024.
| DOI: | 10.1109/JMW.2024.3405633 |
| Weblink: | https://ieeexplore.ieee.org/document/10557779 |
29.
C. Bonfert,
E. Ruopp and
C. Waldschmidt,
"Improving SAR Imaging by Superpixel-Based Compressed Sensing and Backprojection Processing",
IEEE Transactions on Geoscience and Remote Sensing,
vol. 62,
pp. 1—12,
Apr.
2024.
https://ieeexplore.ieee.org/document/10491303/.
| DOI: | 10.1109/TGRS.2024.3385027 |
28.
J. Kanz,
C. Bonfert,
R. Riekenbrauck and
C. Waldschmidt,
"Bistatic UAV-Based Repeater SAR for 3D Object Localization"
in EUSAR 2024; 15th European Conference on Synthetic Aperture Radar,
Apr.
2024.
| File: | https://doi.org/10.18725/OPARU-53904 |
27.
D. Schwarz,
M. Linder,
V. Kienle,
C. Bonfert and
C. Waldschmidt,
"Time and Frequency Division Multiplexing in High-Resolution Imaging Radars with LO Feedthrough Topology"
in ICMIM 2024 - International Conference on Microwaves for Intelligent Mobility,
Boppard,
April 2024,
Berlin - Offenbach:
VDE VERLAG GmbH,
Apr.
2024,
pp. 22-25.
| ISBN: | 978-3-8007-6364-1 |
| File: | https://doi.org/10.18725/OPARU-53903 |
26.
I. Ullmann,
C. Bonfert,
A. Grathwohl,
M. A. Lahmeri,
V. Mustieles-Pérez,
J. Kanz,
E. Sterk,
F. Bormuth,
R. Ghasemi,
P. Fenske,
M. Villano,
R. Schober,
R. F. H. Fischer,
G. Krieger,
C. Damm,
C. Waldschmidt and
M. Vossiek,
"Towards Detecting Climate Change Effects With UAV-Borne Imaging Radars",
IEEE Journal of Microwaves,
pp. 1-13,
2024.
| DOI: | 10.1109/JMW.2024.3450015 |
2023
25.
D. Werbunat,
B. Woischneck,
J. Lerch,
B. Schweizer,
R. Michev,
C. Bonfert,
J. Hasch and
C. Waldschmidt,
"Multichannel Repeater for Coherent Radar Networks Enabling High-Resolution Radar Imaging",
IEEE Transactions on Microwave Theory and Techniques,
Nov.
2023.
https://ieeexplore.ieee.org/document/10335758.
| DOI: | 10.1109/TMTT.2023.3326284 |
24.
D. Werbunat,
B. Schweizer,
M. Maier,
C. Bonfert,
D. Schindler,
P. Hinz,
J. Hasch and
C. Waldschmidt,
"An All-Digital Carrier Synthesis for Stepped OFDM Radars",
Jun.
2023.
| DOI: | 10.1109/IMS37964.2023.10187968 |
| Weblink: | https://ieeexplore.ieee.org/document/10187968 |
| File: | http://dx.doi.org/10.18725/OPARU-51515 |
23.
D. Schwarz,
M. Linder,
C. Bonfert and
C. Waldschmidt,
"Improving the Image Quality in High-Resolution 4D Radars with Sparse Arrays by Compressed Sensing"
in International Conference on Electromagnetics in Advanced Applications (ICEAA),
2023.
| DOI: | 10.1109/ICEAA57318.2023.10297850 |
| File: | http://dx.doi.org/10.18725/OPARU-51252 |
2022
22.
A. Grathwohl,
M. Stelzig,
J. Kanz,
P. Fenske,
A. Benedikter,
C. Knill,
I. Ullmann,
I. Hajnsek,
A. Moreira,
G. Krieger,
M. Vossiek and
C. Waldschmidt,
"Taking a Look Beneath the Surface: Multicopter UAV-Based Ground-Penetrating Imaging Radars",
IEEE Microwave Magazine,
vol. 23,
no. 10,
pp. 32-46,
2022.
| DOI: | 10.1109/MMM.2022.3188126 |
2021
21.
C. Knill,
F. Embacher,
B. Schweizer,
S. Stephany and
C. Waldschmidt,
"Coded OFDM Waveforms for MIMO Radars",
IEEE Transactions on Vehicular Technology,
pp. 1-1,
2021.
| DOI: | 10.1109/TVT.2021.3073268 |
| File: |  https://mwt-www.e-technik.uni-ulm.de/world/data/downloads/papers/2021/2021_TVT_Knill_Coded_OFDM_Waveforms_for_MIMO_Radars.pdf |
20.
C. Knill,
B. Schweizer,
S. Stephany,
D. Werbunat and
C. Waldschmidt,
"FMCW-Interference of Frequency Agile OFDM Radars"
in European Radar Conference (EuRAD),
2021,
pp. 160-163.
| DOI: | 10.1109/EuRAD48048.2021.00050 |
| File: | https://mwt-www.e-technik.uni-ulm.de/world/data/downloads/papers/2020/2020_EuRAD_Knill_FMCW_Interference_of_Frequency_Agile_OFDM_Radars.pdf |
19.
B. Schweizer,
A. Grathwohl,
G. Rossi,
P. Hinz,
C. Knill,
S. Stephany,
H. J. Ng and
C. Waldschmidt,
"The Fairy Tale of Simple All-Digital Radars: How to Deal With 100 Gbit/s of a Digital Millimeter-Wave MIMO Radar on an FPGA [Application Notes]",
IEEE Microwave Magazine,
vol. 22,
no. 7,
pp. 66-76,
2021.
| DOI: | 10.1109/MMM.2021.3069602 |
2020
18.
C. Knill,
B. Schweizer and
C. Waldschmidt,
"Interference-Robust Processing of OFDM Radar Signals Using Compressed Sensing",
IEEE Sensors Letters,
vol. 4,
no. 4,
pp. 1-4,
Apr.
2020.
IEEE.
| DOI: | 10.1109/LSENS.2020.2980165 |
| File: | https://mwt-www.e-technik.uni-ulm.de/world/data/downloads/papers/2020/2020_SensorsLetter_Knill_Interference_Robust_Processing_OFDM.pdf |
2019
17.
F. Roos,
P. Hügler,
C. Knill,
L. L. Tovar Torres,
N. Appenrodt,
J. Dickmann and
C. Waldschmidt,
"Comparison of 2D and 3D Compressed Sensing for High-Resolution TDM-MIMO Radars"
in European Radar Conference,
Oct.
2019.
| File: | https://mwt-www.e-technik.uni-ulm.de/world/data/downloads/papers/2019/2019_EuMW_Roos_Comparison_of_2D_and_3D_Compressed_Sensing_for_High_Resolution_TDM_MIMO_Radars.pdf |
16.
F. Roos,
J. Bechter,
C. Knill,
B. Schweizer and
C. Waldschmidt,
"Radar Sensors for Autonomous Driving: Modulation Schemes and Interference Mitigation",
IEEE Microwave Magazine,
vol. 20,
no. 9,
pp. 58-72,
Sep.
2019.
15.
C. Knill,
F. Roos,
B. Schweizer,
D. Schindler and
C. Waldschmidt,
"Random Multiplexing for an MIMO-OFDM Radar With Compressed Sensing-Based Reconstruction",
IEEE Microwave and Wireless Components Letters,
vol. 29,
no. 4,
pp. 300--302,
Apr.
2019.
| DOI: | 10.1109/LMWC.2019.2901405 |
| File: | https://mwt-www.e-technik.uni-ulm.de/world/data/downloads/papers/2019/2019_MWCL_Knill_Random_Multiplexing_MIMO_OFDM.pdf |
14.
F. Roos,
P. Hügler,
L. L. Tovar Torres,
C. Knill,
J. Schlichenmaier,
C. Vasanelli,
N. Appenrodt,
J. Dickmann and
C. Waldschmidt,
"Compressed Sensing based Single Snapshot DoA Estimation for Sparse MIMO Radar Arrays"
in German Microwave Conference,
Mar.
2019.
13.
F. Roos,
P. Hügler,
J. Bechter,
M. A. Razzaq,
C. Knill,
N. Appenrodt,
J. Dickmann and
C. Waldschmidt,
"Effort Considerations of Compressed Sensing for Automotive Radar"
in Radio and Wireless Symposium (RWS),
Jan.
2019.
| File: | https://mwt-www.e-technik.uni-ulm.de/world/data/downloads/papers/2019/2019_RWW_Roos_Effort_Considerations_of_Compressed_Sensing_for_Automotive_Radar.pdf |
2018
12.
C. Knill,
B. Schweizer,
P. Hügler and
C. Waldschmidt,
"Impact of an Automotive Chirp-Sequence Interferer on a Wideband OFDM Radar",
2018 15th European Radar Conference (EuRAD),
pp. 34--37,
Sep.
2018.
11.
C. Knill,
B. Schweizer,
S. Sparrer,
F. Roos,
R. F. H. Fischer and
C. Waldschmidt,
"High Range and Doppler Resolution by Application of Compressed Sensing Using Low Baseband Bandwidth OFDM Radar",
IEEE Transactions on Microwave Theory and Techniques,
vol. 66,
no. 7,
pp. 3535-3546,
Jul.
2018.
| DOI: | 10.1109/TMTT.2018.2830389 |
| File: | https://mwt-www.e-technik.uni-ulm.de/world/data/downloads/papers/2018/2018_MTT_Knill_High_Range_and_Doppler_Resolution_by_Compressed_Sensing_Using_OFDM_Radar.pdf |
10.
F. Roos,
P. Hügler,
C. Knill,
N. Appenrodt,
J. Dickmann and
C. Waldschmidt,
"Data Rate Reduction for Chirp-Sequence based Automotive Radars using Compressed Sensing"
in German Microwave Conference (GeMiC),
Mar.
2018.
| File: | https://mwt-www.e-technik.uni-ulm.de/world/data/downloads/papers/2018/2018_GeMiC_Roos_Data_Reduction_Chirp_Sequence_based_Automotive_Radars_Compressed_Sensing.pdf |
9.
B. Schweizer,
D. Schindler,
C. Knill,
J. Hasch and
C. Waldschmidt,
"Expanding the Unambiguous Velocity Limitation of the Stepped-Carrier OFDM Radar Scheme"
in 2018 15th European Radar Conference (EuRAD),
2018,
pp. 22-25.
| DOI: | 10.23919/EuRAD.2018.8546621 |
| File: | https://mwt-www.e-technik.uni-ulm.de/world/data/downloads/papers/2018/2018_EURAD_Schweizer_Expanding_the_Unambiguous_Velocity_Limitation_of_the_Stepped-Carrier |
8.
D. Schindler,
B. Schweizer,
C. Knill,
J. Hasch and
C. Waldschmidt,
"MIMO-OFDM Radar Using a Linear Frequency Modulated Carrier to Reduce Sampling Requirements",
IEEE Transactions on Microwave Theory and Techniques,
vol. 66,
no. 7,
pp. 3511-3520,
2018.
| DOI: | 10.1109/TMTT.2018.2814592 |
7.
B. Schweizer,
D. Schindler,
C. Knill,
J. Hasch and
C. Waldschmidt,
"On Hardware Implementations of Stepped-Carrier OFDM Radars"
in 2018 IEEE/MTT-S International Microwave Symposium - IMS,
2018,
pp. 891-894.
| DOI: | 10.1109/MWSYM.2018.8439179 |
| File: | https://mwt-www.e-technik.uni-ulm.de/world/data/downloads/papers/2018/2018_IMS_Schweizer_On_Hardware_Implementations_of_Stepped-Carrier_OFDM_Radars.pdf |
6.
B. Schweizer,
C. Knill,
D. Schindler and
C. Waldschmidt,
"Stepped-Carrier OFDM-Radar Processing Scheme to Retrieve High-Resolution Range-Velocity Profile at Low Sampling Rate",
IEEE Transactions on Microwave Theory and Techniques,
vol. 66,
no. 3,
pp. 1610-1618,
2018.