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Amélioration de la sensibilité de détection et de la qualité du radargramme d’un radar pénétrant GPR par une modulation micro-onde

Improvement of the sensitivity detection and quality of radargram for a GPR by a micro-wave modulation

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Résumé

L’effet primaire du champ continuellement capté par un systèmeGpr est la production d’une classe qui limite le contraste des réflexions sur les cibles. La trace d’une cible devient illisible vue l’influence de certaines perturbations qui sont dues aux réflexions causées par certains éléments parasites, ou bien à cause du problème de dispersion. Nous présentons dans cet article une approche basée sur une modulation micro-onde qui a permis de pallier ce problème. La technique proposée permet de faire une classification de signaux. On montrera que la fréquence de modulation fm doit être supérieure à une fréquence de coupure fc qui dépend des paramètres électriques du sol. Dans la seconde partie de l’article, on montre comment améliorer la qualité du radargramme d’un systèmeGpr par une simple convolution entre le signal capté et une ondelette avec des paramètres bien définis.

Abstract

The primary effect of the field continuously capted by aGpr is the production of a class which limits the contrast of the reflections on the targets. The target response becomes illegible sight the influence of certain disturbances which are due to the reflections caused by certain parasitic elements which are randomly distributed in the soil and the dispersion phenomenon. We present in this paper an approach based on a μ-wave modulation which allowed stage this problem. The technique suggested makes it possible to do a classification of capted signals. It will be shown that the frequency of modulation fm must be higher than a cut-off frequency fc which depends on the electric parameters of the ground. In a second part of this paper, we show how to improve quality of the radargram of a systemGpr by a simple convolution between the collected signal and a wavelet with a defined parameters.

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Belkadid, J., Bennani, S.D. & Rifi, M. Amélioration de la sensibilité de détection et de la qualité du radargramme d’un radar pénétrant GPR par une modulation micro-onde. Ann. Télécommun. 61, 565–577 (2006). https://doi.org/10.1007/BF03219923

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  • DOI: https://doi.org/10.1007/BF03219923

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