An Ultra Wideband Impulse Optoelectronic Radar: Rugbi

Abstract

Abstract-An ultra wideband radar system based on a coherent emission of an ultra-wideband antenna array using photoconductive switching devices is proposed. The triggering process is obtained by the excitation of semiconductor samples in linear mode using a picosecond laser source. The emitting antenna system and the receiving antenna developed by the Research Institute XLIM present some specific qualities suitable for radiation and measurement of ultrashort pulses. The optical control of the sources allows to sum the The experiments realized with this optoelectronic array validate these two concepts. Another way of improving these systems is proposed. It involves using bipolar pulse generators.

Picosecond switching of high-voltage reverse-biased p +-n-n + structures to the conductive state by pulsed light

“…Для управления коммутатором можно использовать импульсы света с длительностью порядка десятков пикосекунд и энергией, примерно в 1000 раз меньше, чем а) излучается многими современными коммерческими Nd:YAG лазерами с длиной волны 1,064 мкм, почти идеально подходящей для кремниевых фотодиодов и б) необходима для работы коммутато-ров на основе фотосопротивлений [17], использованных при создании сверхширокополосно-го радара [18]. Развитая в работе теория может служить основой для проектирования подоб-ных коммутаторов с оптимальным сочетанием параметров.…”

A Precorrection Method for Passive UWB Time-Reversal Beamformer

“…In the beamforming context, the applications are limited by the difficulty of conceiving RF components presenting the same behavior on a large part of the electromagnetic spectrum. Several solutions have been proposed such as photoconductive switching devices [3] and active delay lines [4] to feed each antenna of an array with the appropriate phase ramp over an ultrawide band. In this context, an original method has been developed in order to achieve ultrawideband beamforming in a passive way [5].…”

Ultrafast Autonomous Detection and Scanning System Based on Optoelectronic Pulse Switching

“…However, a major difficulty with such a configuration is the minimization of the radiation source jitters, to obtain the better synchronization as possible. A solution consists in using pulsed optoelectronic devices, operating in linear switching regime, which permits to bypass this difficulty and to obtain ultra-short electrical waveforms with small temporal jitters (2 ps typically) [2]. In that linear switching regime each incident photon is converted in an electron-hole pair inside the semi-conductor.…”