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Optimisation de la commutation d'antennes et détection de passagers par SVM, dans un contexte de contrôle d'accès pour véhicule

Abstract : This thesis studies two aspects of a vehicle access control system which relies on the estimation of a key's location to grant access.Firstly, within the context of a triangulation-based system, we study the optimisation of the switching sequence for switched antenna-arrays.A model is given to study the estimation of the parameters of sines received by a switched array, where sensors are not necessarily sampled synchronously.This model is relevant, but not exclusive, to industrial approaches to direction of arrival estimation, such as the one proposed by Bluetooth 5.1, which serves as our reference application.From the model, Cramér-Rao lower bounds are computed, and are used to define design criteria for switching sequences that do not rely on the array's geometry.These criteria's analytical forms allow us to highlight desirable properties in switching sequences, especially in the case where the signal's frequency is unknown.Strategies to build switching sequences are proposed, and numerically evaluated using the provided criteria. Comparison of the criteria with numerical bounds on direction of arrival for common array geometries shows that they are qualitatively linked.Secondly, within the context of a time of flight based system, we propose a system for passenger detection that relies solely on the localization system's original hardware.To achieve this, we propose to use support vector machines (SVM) to classify the channel impulse responses measured between the system's transmitters.A proof of concept is designed to demonstrate feasability, and data is collected on a prototype for further evaluation.By studying the available data, invariants are identified, and processing functions are proposed to translate these invariants to the SVM in order to improve performance.One of the proposed processing is shown to give performance gains for our application through experiments.
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Submitted on : Monday, September 27, 2021 - 12:17:26 PM
Last modification on : Monday, October 4, 2021 - 9:53:23 AM

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  • HAL Id : tel-03355331, version 1

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Pierre Avital. Optimisation de la commutation d'antennes et détection de passagers par SVM, dans un contexte de contrôle d'accès pour véhicule. Traitement du signal et de l'image [eess.SP]. Université Paris-Saclay, 2021. Français. ⟨NNT : 2021UPASG049⟩. ⟨tel-03355331⟩

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