Echo+noise signal

Hello, I want to create an artificial echo+noise signal, how can I create it?

[Abderrahim. B]

Which kind of Echo (RDARA, SONAR, ..)? and Which type of noise you want to add to this echo ?

[Adam Danz]

Mehmet Özgür Güzel's answer moved here as a comment

I will measure distance with laser. I will artificially generate an echo+noise signal, I will generate 100 of these signals and make a pulse integration.

but I don't know what kind of noise and what kind of echo to use. but radar.

Answer 1

[Chunru]

% generate a waveform 
f0 =100;  fs=1000;  pw = 0.1; pri = 1; npulses = 10;

s = cos(2*pi*f0*(0:1/fs:pw))';      % it can be any other waveform of your choice
s(round(fs*pri)) = 0;               % PRI
s = repmat(s, npulses, 1);          % npulses

% echo: delayed signal

tau = 0.3;  ntau = round(fs*tau); amp = 0.5;
e = amp* circshift(s, ntau);

% add noise
sigma = 0.1;
r = s + e + sigma*randn(size(s));

plot((0:length(s)-1)/fs, r)

[Mehmet Özgür Güzel]

What is intended to be done in this code, what are the operations performed?

[Chunru]

The code has comments to indicate what have been done. Can you be more specific?

[Mehmet Özgür Güzel]

What do pri, tau and pr mean?

[Chunru]

PRI for pulse repetition interval; tau for delay; PW for pulse width