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Theses

Modélisation du canal en ondes millimétriques pour des applications radar automobile

Emna Bel Kamel 1, 2
2 Lab-STICC_IMTA_MOM_PIM
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
Abstract : Improving road safety as well as the development of intelligent transport systems are issues of the future in the automotive sector with a considerable rise of the semi-autonomous and autonomous vehicle. The active safety systems that increasingly equip commercial vehicles use radar sensors (long and short range) operating in the 24 GHz or 77GHz bands. The study and development of such sensors can be facilitated through the use of a generic simulation platform to simulate a radar system coupled to its environment according to predefined standard scenarios. It is then necessary to have a reliable and realistic representation of the environment as well as targets. This thesis deals with the characterization and modelling of the propagation channel for radar applications, in terms of propagation phenomena (multipath, reflection, diffraction …) and electrically large targets. A combination of asymptotic methods was developed for the analysis of electrically large problems in W band, while reducing the requirements in CPU time and memory. The accuracy of the simulator was evaluated with radar cross section measurement of canonical and complex small targets (not exceeding 6 cm) in an anechoic chamber. The developed bench measurement also made it possible to validate an experimental procedure for determining the radar signature. Indeed, the experimental characterization was generalized to characterize various automotive related targets in an “indoor” environment. Measurement results matched well with the results presented in the literature. Moreover, the experimental data allows the extraction of a simple target description in terms of scattering points which model the diffusion and specular reflection phenomena. The high frequency response of a target can be approached by the sum of the responses of its scattering centres. It is thus proposed to simplify the measured signatures in order to increase the computation efficiency. Compared to detailed geometrical representation of a complex target, scattering centre model leads to better efficiency of ray-based propagation simulations of road scenarios. The model also takes into account the scattering centre anisotropy (in the azimuth plan) by modelling their amplitudes by Gaussian ones.
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Submitted on : Friday, June 8, 2018 - 11:51:06 AM
Last modification on : Sunday, October 18, 2020 - 3:36:46 AM

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2017IMTA0042_BelKamel-Emna.pdf
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  • HAL Id : tel-01810858, version 1

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Emna Bel Kamel. Modélisation du canal en ondes millimétriques pour des applications radar automobile. Traitement du signal et de l'image [eess.SP]. Ecole nationale supérieure Mines-Télécom Atlantique, 2017. Français. ⟨NNT : 2017IMTA0042⟩. ⟨tel-01810858⟩

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