Source ranging with minimal environmental information using a virtual receiver and waveguide invariant theory

2000 ◽  
Vol 108 (4) ◽  
pp. 1582-1594 ◽  
Author(s):  
Aaron M. Thode
Keyword(s):  
Invariant Theory ◽  
Environmental Information ◽  
Waveguide Invariant

Focusing Green's function using the waveguide invariant theory

2021 ◽  
Vol 150 (4) ◽  
pp. A281-A281
Author(s):  
Daehwan Kim ◽  
Donghyeon Kim ◽  
J. S. Kim
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Invariant Theory ◽  
Waveguide Invariant

Applications of source localization by waveguide invariant theory during the ASIAEX sea tests

2002 ◽  
Vol 112 (5) ◽  
pp. 2451-2451
Author(s):  
Altan Turgut ◽  
Stephen Wolf ◽  
Bruce Pasewark ◽  
Marshall Orr ◽  
James Lynch
Keyword(s):  
Source Localization ◽  
Invariant Theory ◽  
Waveguide Invariant

scholarly journals Application of Waveguide Invariant Theory to Analysis of Interference Phenomenon in Deep Ocean

Acoustics ◽  
2020 ◽  
Vol 2 (3) ◽  
pp. 595-604
Author(s):  
Yuan Yao ◽  
Chao Sun ◽  
Xionghou Liu
Keyword(s):  
Phase Velocity ◽  
Sound Velocity ◽  
Interference Pattern ◽  
Invariant Theory ◽  
Low Frequency ◽  
Phase Speed ◽  
Deep Ocean ◽  
Interference Phenomenon ◽  
Waveguide Invariant ◽  
Slope Change

When a hydrophone is deployed under the critical depth in deep ocean, the interference pattern will be complex and variable. The waveguide invariant is no longer constant and is treated as a distribution. The interference pattern is impacted by refracted and surface reflected (RSR) modes, as well as surface reflected and bottom reflected (SRBR) modes together. This phenomenon is illustrated by numerical simulation and explained by the waveguide invariant theory in this paper. The theory demonstrates: (1) The interference pattern in zone-b corresponds to the waveguide invariant βRSR that varies quickly and leads to the slope change, which is contributed by RSR modes whose phase velocity is less than the sound velocity at seafloor; (2) The interference pattern in zone-a1 and zone-c1 is corresponding to the βSRBRWS that is the approximately 0.7 and leads to the stable slope, which is contributed by SRBR modes whose phase velocity is between the sound velocity at seafloor and sediment velocity; (3) The interference pattern in zone-a2 and zone-c2 is corresponding to the βSRBRSH which hardly varies at low frequency but varies fiercely with source frequency increasing, so the striations are complex with high frequency, which is contributed by SRBR modes whose phase speed is between sediment speed and half space speed.

Sign in / Sign up

Export Citation Format

Share Document