Signal Processing

Question

contessa mima 2012-2-29

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https://ww2.mathworks.cn/matlabcentral/answers/30640-signal-processing

In my project, i have to: 1/ Create(generate)a pulse train signal wich is received from an aircraft as a request to the DME system. 2/ create a GUI. 3/Via this GUI, i can take mesurement, check it (freq, delay, ID...).

I need your help.Tnx

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UJJWAL 2012-2-29

Do you need to take inputs from a real DME system ?? Or do you just want to simulate ?

contessa mima 2012-2-29

i want just to simulate. for the signal, i'll try to generate it by codes if it is not so complicated.

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Answer 1

UJJWAL 2012-2-29

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Hi, I don't know still exactly how I can help u as the whole GUI thing and all is difficult to post in one answer here. For your convenience I am giving you an idea of how to generate a signal as a pulse train. I hope it would make things a bit easier for you.

delay_random = random('gaussian',0,10,1,1)* 2; % Delay randomly generated
freq_random = random('gaussian',0,10,1,1)*100; % Frequency randomly generated
phase_random = random('gaussian',0,10,1,1)*100; %Phase randomly generated
time = 0:1/50:10 ; %Time from 0 to 10 seconds 
pulse_time = 0:1/50:0.5; %Pulse duration from 0 to 0.5 seconds
a=0;
p = 0;
signal  = zeros(1,length(0:1/50:delay_random));
while(p <=10)
    a = cos(2*pi*freq_random*(0:1/50:0.5) + phase_random);
    p=p+0.5;
    signal = cat(signal,a);
end
figure(1);
plot(time,a);

You can use this code to write for event when you press a button on your GUI like a button to generate the pulse train. If you want you can add some noise to this code to make things a bit more realistic.. For any other help ,feel free to contact.

The estimation part I leave on you. It depends on what method you have to use