find the sidelobe level

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lucky yeggina
lucky yeggina 2011-3-26
评论： ibrahim ahmed 2019-10-27
greetings.,
i worked on my graph plotting the radiation pattern of an antenna array. so., could anyone help me about findin the amplitude of the first sidelobe?? please...
  2 个评论
bym
bym 2011-3-26
can you post a picture of your graph?
lucky yeggina
lucky yeggina 2011-3-29
sure i can., but the problem is that., since i used the variable to be random number., the graph changes....... for every simulation.

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Honglei Chen
Honglei Chen 2011-3-28
If you have Signal Processing Toolbox, you can use findpeaks function to find peaks. In your case, if you find two biggest peaks then the second one should be your first sidelobe. You can see if you have the license for Signal Processing Toolbox by running following command
>> ver
The findpeaks function has been shipping since R2007b. It also gets a major improvement during R2010a.
HTH
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Ibrahim Ibrahim
Ibrahim Ibrahim 2013-4-10
really yur answer is so much helpful :)
ibrahim ahmed
ibrahim ahmed 2019-10-27
I am sorry but I didn't understand can you ,Honglei Chen Explain for me please Because I'm a beginner

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更多回答（1 个）

bym
bym 2011-3-26
you can use
diff()
to see where the slop of the amplitude changes sign

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