Help needed with xcorr in matlab

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radhikaa90

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Hi.. I am new to matlab simulink n I need this help for my project..

I generated a chirp n added noise (random) n when I xcorr in simulink I get a single peak.. But when I use the same xcorr for two chirps seperated by some distance I get three peaks instead of two.. Can anyone tell me what wrong am I doing?

Thank u in advance
 

Frequency range is 300khz-800khz
Sampling frequency 20e6
Time period 100e-6
 
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