Behavior and Sensitivity of Phase Arrival Times (PHASE)
Abstract
Our long-term goal is to study the sensitivity behavior of acoustic phase arrival times, as an alternative observable offering increased resolution (compared to peak arrivals), for the recovery of sound-speed perturbations in the ocean. The objective of this work is to study the behavior and sensitivity of ocean acoustic phase arrival times due to sound-speed changes, in comparison to those of peak arrival times. The aim is to derive perturbation relations and sensitivity kernels connecting sound-speed and travel-time perturbations, and, further, to study the behavior of phase arrival times and its predictability, depending on propagation and signal characteristics. Phase arrival times are mathematically modeled as stationary points - times of constant phase - of the acoustic pressure. Using this definition, expressions for the corresponding travel-time perturbations are derived and the sensitivity behavior of phase arrival times, due to sound speed changes, is studied. The resulting sensitivity kernels (Born-Frechet kernels) for phase arrival times are compared to the corresponding travel-time sensitivity kernels for peak arrivals.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 2013
- Accession Number
- ADA598648
Entities
People
- Bruce D. Cornuelle
- Emmanuel Skarsoulis
- Matthew A. Dzieciuch
Organizations
- University of California Regents