How to create an underwater acoustic pulse of 1 magnitude peak in time domain using Phased array toolbox

I am trying to design a Uniform Linear Array of Hydrophones. I want to design a pulse that represents bubble bursting from wave breaking on the surface of the ocean. I am using phased.IsoSpeedUnderwaterPaths and phased.MultipathChannel for transmitting the signal. I have tried using phased.UnderwaterRadiatedNoise but could not make it work out. Any suggestions? The operating frequency is 20kHz and sampling frequency 40kHz.

Answer 1

[Moksh]

Hi Shobhit,

You can try using the ‘RectangularWaveform’ function of the phased array toolbox in MATLAB, which can also help in creating an acoustic waveform.

Here is an example for this:

prf = 1; % Pulse repetition frequency
pulseWidth = 10e-3;
pulseBandwidth = 1/pulseWidth;
fs = 2*pulseBandwidth; % Sampling frequency

% Defining the rectangular pulse waveform system object
wav = phased.RectangularWaveform('PRF',prf,'PulseWidth',pulseWidth,'SampleRate',fs);

wave = wav(); % Generated Wave

This creates a magnitude 1 waveform in the time domain.

For further understanding of this function and your required changes, you can refer to the following documentation.

https://in.mathworks.com/help/phased/ref/phased.rectangularwaveform-system-object.html

https://in.mathworks.com/help/phased/ug/locating-an-acoustic-beacon-with-a-passive-sonar-system.html?searchHighlight=underwater%20pulse&s_tid=srchtitle_support_results_5_underwater%20pulse

Hope this helps!