Long‐range nonlinear geometric acoustic pulse propagation in the atmosphere

1985 ◽  
Vol 77 (S1) ◽  
pp. S46-S46
Author(s):  
Stephen I. Warshaw ◽  
Paul F. Dubois
Keyword(s):  
Long Range ◽  
Pulse Propagation ◽  
Acoustic Pulse ◽  
Nonlinear Geometric

NEAR-AXIAL INTERFERENCE EFFECTS IN LONG-RANGE OCEAN ACOUSTIC PULSE PROPAGATION

2008 ◽  
Vol 16 (02) ◽  
pp. 279-301
Author(s):  
NATALIE S. GRIGORIEVA ◽  
GREGORY M. FRIDMAN
Keyword(s):  
Long Range ◽  
Pulse Propagation ◽  
North Pacific Ocean ◽  
Acoustic Pulse ◽  
Three Dimensional ◽  
Realistic Model ◽  
Center Frequency ◽  
Sound Channel ◽  
The Time Domain ◽  
Dimensional Range

In many long-range ocean propagation experiments the source and receiver are placed close to the depth of the waveguide axis. In this case, rays emerging from the source at sufficiently small angles intersect the sound-channel axis many times and form in its vicinity a large number of caustics with caustics cusps located repeatedly along the axis. In neighborhoods of cusped caustics there exists a very complicated interference pattern. Neighborhoods of interference grow with range and at long ranges they overlap. As a result, a complex interference wave (axial wave), that propagates along the waveguide axis, appears. The goal of this paper is to obtain the representation for the axial wave in the time domain and calculate its magnitude for a realistic model of a three-dimensional range-independent medium. Numerical computations are done for the average profile from the Acoustic Engineering Test (AET) experiment. The pulse center frequency of 75 Hz with 30-Hz bandwidth is used that corresponds to broadband acoustic signals which were transmitted during November 1994 in the eastern North Pacific Ocean as a part of the AET. The propagation range is 3250 km. The sound source is located on the waveguide axis, and the receiver is placed close to the depth of the axis. Through numerical simulation the dependencies of the magnitude of the axial wave on depth of the receiver and propagation range are studied.

Acoustic pulse propagation studies in the Gulf of Mexico

2005 ◽  
Author(s):  
J.W. Caruthers ◽  
V. Kamenkovich ◽  
N.A. Sidorovskaia ◽  
I. Udovydchenkov ◽  
G. Ioup
Keyword(s):  
Gulf Of Mexico ◽  
Pulse Propagation ◽  
Acoustic Pulse

Acoustic pulse propagation in an urban environment

2005 ◽  
Vol 117 (4) ◽  
pp. 2418-2418
Author(s):  
Donald G. Albert ◽  
Lanbo Liu
Keyword(s):  
Urban Environment ◽  
Pulse Propagation ◽  
Acoustic Pulse
Sign in / Sign up

Export Citation Format

Share Document