title: Target-depth estimation in active sonar: Cramer-Rao bounds for a bilinear sound-speed profile.
abstract: This paper develops a localization method to estimate the depth of a target in the context of active sonar, at long ranges. The target depth is tactical information for both strategy and classification purposes. The Cramer-Rao lower bounds for the target position as range and depth are derived for a bilinear profile. The influence of sonar parameters on the standard deviations of the target range and depth are studied. A localization method based on ray back-propagation with a probabilistic approach is then investigated. Monte-Carlo simulations applied to a summer Mediterranean sound-speed profile are performed to evaluate the efficiency of the estimator. This method is finally validated on data in an experimental tank.
authors.affiliation: Département DIS, Gipsa-Lab, 11 rue des Mathématiques, BP46, F-38402 Saint Martin d'Heres Cedex, France.
authors.forename: Alexis
authors.initials: A
authors.lastname: Mours
authors.affiliation: Département DIS, Gipsa-Lab, 11 rue des Mathématiques, BP46, F-38402 Saint Martin d'Heres Cedex, France.
authors.forename: Cornel
authors.initials: C
authors.lastname: Ioana
authors.affiliation: Département DIS, Gipsa-Lab, 11 rue des Mathématiques, BP46, F-38402 Saint Martin d'Heres Cedex, France.
authors.forename: Jérôme I
authors.initials: JI
authors.lastname: Mars
authors.affiliation: Département GSS, Thales Underwater Systems S.A.S., 525 Route des Dolines, BP 157, 06903 Sophia Antipolis Cedex, France.
authors.forename: Nicolas F
authors.initials: NF
authors.lastname: Josso
authors.affiliation: Département GSS, Thales Underwater Systems S.A.S., 525 Route des Dolines, BP 157, 06903 Sophia Antipolis Cedex, France.
authors.forename: Yves
authors.initials: Y
authors.lastname: Doisy