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Architecture d’échantillonnage rapide pour l’imagerie RADAR

Abstract : Typically, the waveforms transmitted by UWB radar cover a spectrum higher than a decade, in the 100MHz-10GHz frequency range. UWB Radar imaging has grown significantly in recent past years and is used for a large number of applications as defence, civil security and biomedical. One of their advantages lies in the fact that microwaves are able to penetrate through non-conductive materials with centimeter resolution. In UWB pulse radar, the bandwidth can reach several GHz, so that an Analog-to-Digital Converter (ADC) needs a high sampling rate and with a high resolution (>12 bits) to guarantee enough dynamic range. However, it is now possible to directly measure time-domain radar signal by associating an ADC with a Track and Hold Amplifier T&HA with wide RF bandwidth and with a maximum sampling frequency of several GSa/s. This work involves the development of a UWB SAR Radar demonstrator based on the use of a coherent sub-sampling technique for measuring UWB Radar signals. This UWB Radar demonstrator is built around a fast ADC (500 MS/s), an FPGA, and an ultra-wideband T&HA (5 GHz). It allows target detection by processing based on the use of a Radar image reconstruction algorithm.
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Oussama Hamdi. Architecture d’échantillonnage rapide pour l’imagerie RADAR. Electronique. Université de Limoges, 2019. Français. ⟨NNT : 2019LIMO0120⟩. ⟨tel-02515961⟩

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