J. Phys. IV France
Volume 04, Numéro C5, Mai 1994
3ème Congrés français d'acoustique
3rd French conference on acoustics
Page(s) C5-1335 - C5-1338
3ème Congrés français d'acoustique
3rd French conference on acoustics

J. Phys. IV France 04 (1994) C5-1335-C5-1338

DOI: 10.1051/jp4:19945297

Système de mesure du Doppler différentiel sur raies fluctuantes


1  752 chemin du Pigeonnier, 06480 La Colle sur Loup, France
2  Société Thomson Sintra ASM, 525 Route des Dollines, Parc de Sophia-Antipolis, BP. 138, 06561 Valbonne cedex, France

In order to use differential Doppler (D.D) in target motion analysis, we present a measurement system providing accurate D.D estimation when the primary frequency lines are linearly modulated. Such low frequency variation, generally due to source motion, is frequently perturbating classical high resolution measurement techniques on real signals (Time delay-Doppler ambiguity, acceleration,..). The proposed system provides a non biaised estimation and avoids any perturbation induced by this phenomena. The algorithm, based on a maximum likehood estimator associated to a phase tracking loop, reaches theoretically the Cramer-Rao bound. Futhermore simulation results demonstrate the good practical behaviour of this system.

© EDP Sciences 1994