Eigenray sonar simulation in two-layer media
| dc.contributor.advisor | Ling, Hao | en |
| dc.contributor.advisor | Story, Mark | en |
| dc.creator | Clark, Jonathan Michael | en |
| dc.creator.orcid | 0000-0003-4744-9609 | en |
| dc.date.accessioned | 2016-07-01T16:46:55Z | |
| dc.date.accessioned | 2018-01-22T22:30:12Z | |
| dc.date.available | 2016-07-01T16:46:55Z | |
| dc.date.available | 2018-01-22T22:30:12Z | |
| dc.date.issued | 2016-05 | en |
| dc.date.submitted | May 2016 | |
| dc.date.updated | 2016-07-01T16:46:55Z | |
| dc.description.abstract | In this work, an eigenray finding method for simulating refractive multipath phenomena in an unbounded underwater environment is presented. To simplify the problem, the environment consists of a horizontally-homogeneous two-layer medium in which isogradient sound speed profiles are used in each layer. Eigenrays are found through an iterative Newton-Raphson method on the Snell invariant, and the travel time is found from the computed Snell invariant. A derivation for the maximum number of ray paths that need to be considered to account for all refractive multipaths is included. Given a point source/point target pair, the method will output a launch angle and travel time for the eigenray connecting the source and target. The time accuracy of the eigenray finding method is confirmed using a forward ray-trace. From the travel time of eigenrays, time series data is formed for each receive element. Refractive multipath phenomena are shown using the time series data of a target near the layer boundary. An FFT beamformer is used to beamform the simulated time series data which reproduces an image of the acoustic targets, which shows a time resolution sufficient to support the coherent addition of signals in beamforming. | en |
| dc.description.department | Electrical and Computer Engineering | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier | doi:10.15781/T2P26Q365 | en |
| dc.identifier.uri | http://hdl.handle.net/2152/38784 | en |
| dc.language.iso | en | en |
| dc.subject | Underwater acoustics | en |
| dc.subject | Sonar | en |
| dc.subject | Ray theory | en |
| dc.subject | Eigenray | en |
| dc.subject | Eigenray finding | en |
| dc.title | Eigenray sonar simulation in two-layer media | en |
| dc.type | Thesis | en |
| dc.type.material | text | en |