3rd French conference on acoustics
J. Phys. IV France 04 (1994) C5-1335-C5-1338
Système de mesure du Doppler différentiel sur raies fluctuantesM.-T. SAUVET-CAROF1 and A. CAROF2
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