Geiß J, Sippel E, Hehn M, Vossiek M (2021)
Publication Language: English
Publication Type: Journal article, Review article
Publication year: 2021
Book Volume: 2
Pages Range: 349-361
URI: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9361646
DOI: 10.1109/OJAP.2021.3061935
Open Access Link: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9361646
In radar systems, antenna arrays acquire direction-dependent information to localize targetsor create images of the environment. However, because of unknown complex amplitudes per channel andmutual coupling, a calibration is necessary for good performance. Common calibration approaches measureto targets under known angles in a multipath-free far-field environment, which often can only be providedby anechoic chambers. Therefore, this process is not suitable for low-cost and frequent calibration. Toovercome these limitations, this paper proposes a novel calibration approach using an unknown but sparsetarget scene. Multiple measurements at known relative positions of the radar are combined to a syntheticaperture. Then, the full mutual coupling matrix is estimated simultaneously with the unknown target scene.The method requires neither target position information, far-field conditions, nor an anechoic chamberbecause multipath propagation can be suppressed easily for targets located in the near-field. The proposedcalibration approach is validated by measurements of a commercial 77 GHz radar. The performance isevaluated by comparing the achieved image quality using the calibration results of this work and theradar’s ex-factory calibration data. The proposed novel calibration procedure improves the image quality,while considerably lowering the demands on the calibration measurements and environment.
APA:
Geiß, J., Sippel, E., Hehn, M., & Vossiek, M. (2021). Antenna Array Calibration Using a Sparse Scene. IEEE Open Journal of Antennas and Propagation, 2, 349-361. https://doi.org/10.1109/OJAP.2021.3061935
MLA:
Geiß, Johanna, et al. "Antenna Array Calibration Using a Sparse Scene." IEEE Open Journal of Antennas and Propagation 2 (2021): 349-361.
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