Publications
Modal analysis of broadband acoustic receptions at megameter ranges
Abstract
Normal modes, the eigenfunctions of the ocean waveguide, are useful in underwater acoustics because the lowest modes provide an efficient description of the most energetic signals at long ranges. Understanding the structure of the mode arrivals at megameter ranges is crucial to tomographic and matched field processing applications, but there have been few opportunities for experimental observations of these signals. This paper presents a short-time Fourier framework for broadband mode processing and applies it to data from the recent Acoustic Thermometry of Ocean Climate (ATOC) experiment. In doing so, this work explicitly addresses the issues associated with broadband signals that have been largely ignored in previous work and provides the first detailed analysis of the modal content of receptions at 3515 km range.
© 2000 IEEE. The article (PDF) appeared in the Proceedings of the IEEE Sensor Array and Multichannel Signal Processing Workshop, pp. 102-106, March 2000. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.