Title :
Acoustic pulse propagation in a range-dependent turbulent ocean
Author :
Tarng, J.H. ; Chang, W.R.
Author_Institution :
Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
When an acoustic pulse propagates a deterministic sound-speed profile, it is distorted since every frequency component experiences different extents of turbulent scattering and echo numbers. Here, the split-step method is used to simulate an acoustic pulse with a 3 kHz carrier propagating through a turbulent ocean with range-independent/dependent sound-speed profiles. It is found that (1) The ocean is a frequency-selective fading channel; (2) The received pulse profile is dependent on the received depth, sound speed distribution, fluctuation strength and scale length of turbulence in oceans; (3) The rms pulsewidth is broadened by several times of its initial value; (4) The increase in fluctuation strength or decrease in the scale length increases the rms pulsewidth; and (5) The statistical properties are similar for both the range-independent and -dependent cases in the mean square sense
Keywords :
acoustic pulses; acoustic wave propagation; oceanography; underwater sound; 3 kHz; 3 kHz carrier; acoustic pulse propagation; acoustic wave propagation; acoustics; broadened pulse; deterministic sound-speed profile; distorted; frequency-selective fading channel; model; ocean; pulse broadening; pulse profile; pulsewidth; range-dependent turbulent ocean; received; scattering; sea; sound-speed profile; split-step method; theory; turbulence; underwater sound; Acoustic distortion; Acoustic propagation; Acoustic pulses; Acoustic scattering; Acoustical engineering; Fluctuations; Frequency; Oceans; Space vector pulse width modulation; Underwater communication;
Conference_Titel :
OCEANS '95. MTS/IEEE. Challenges of Our Changing Global Environment. Conference Proceedings.
Conference_Location :
San Diego, CA
Print_ISBN :
0-933957-14-9
DOI :
10.1109/OCEANS.1995.526900