Détection des cibles mobiles par radar large bande non-ambigu

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Abstract

To improve the efficiency of surveillance radars, we describe a method using a single train of wideband (≈10% relative bandwidth) coherent pulses, rather
than a sequence of several trains of narrow-band pulses. In this technique, target velocity is measured by both pulse-topulse (ambiguous modulo 2π) phase rotation and target distance variation (distance migration) along the pulse train.
The modeling of the targets and clutter are first described, then the limitations of the matched filter processing (existence of residual ambiguities in the form of secondary lobes) are highlighted. An iterative adaptive approach makes it
possible to remedy these faults, in simulation as well as on real experimental signals.
Adaptive clutter suppression techniques are then examined: the influence of the echo spectrum spread and the influence of the bandwidth parameter are analyzed in detail, and an adaptive detector is developed, combining the elimination of clutter and the detection decision.
In conclusion, the operational benefits of this detection by a single train of wideband pulses, compared to the usual technique combining a sequence of narrow-band pulse trains, are summarized, both in terms of sensitivity gains and in terms of velocity resolution and target analysis capability.
Original languageFrench
Pages (from-to)53-66
Number of pages14
JournalRevue de l'Electricite et de l'Electronique
Issue number5
Publication statusPublished - 2017

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