Pierre Poitevin

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The history of perimeter protection is based on building fences. That basic concept evolved into detecting activity along the fences using a variety of sensors. Today a wide variety of fiber and wire-based sensors are available to mount on a fence, as well as many different types of IR, radar, optical, seismic and acoustic sensors to place along the fence(More)
In Digital Beamforming (DBF) radars, multiple beams are formed simultaneously at different azimuth and/or elevation angles to monitor large areas of interest. In order to estimate the location of a target in azimuth without specifically steering the beams at the target or using special techniques such as monopulse, simple centroid schemes can be used. This(More)
With the increased availability of power MOSFET's and GTO's, a new generation of simple choppers for small and medium ac loads is foreseen. These new power semiconductors ease the use of forced commutation to improve the supply power factor even with highly reactive loads. Asymmetrically-and symmetrically modulated ac choppers designed to operate with(More)
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