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Target-depth estimation in active sonar: Cramer-Rao bounds for a bilinear sound-speed profile.

Alexis Mours¹, Cornel Ioana¹, Jérôme I Mars¹

¹Département DIS, Gipsa-Lab, 11 rue des Mathématiques, BP46, F-38402 Saint Martin d'Heres Cedex, France.

The Journal of the Acoustical Society of America

|December 5, 2016

Summary

This study presents a novel active sonar localization method to accurately estimate long-range target depth. The developed technique enhances tactical decision-making and target classification capabilities.

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Area of Science:

Oceanography
Acoustics
Signal Processing

Background:

Accurate target depth estimation is crucial for naval strategy and classification.
Existing methods may lack precision at long ranges in active sonar systems.

Purpose of the Study:

To develop and validate a robust localization method for estimating target depth using active sonar.
To analyze the impact of sonar parameters on localization accuracy.

Main Methods:

Derivation of Cramer-Rao lower bounds for target position (range and depth) using a bilinear profile.
Investigation of a probabilistic ray back-propagation localization method.
Monte-Carlo simulations with a Mediterranean sound-speed profile.

Main Results:

The proposed localization method demonstrates efficiency in estimating target depth.
Analysis reveals the influence of sonar parameters on range and depth standard deviations.
The method was successfully validated using experimental tank data.

Conclusions:

The developed active sonar localization method provides accurate long-range target depth estimation.
This technique offers significant improvements for tactical applications and target identification.