Chirp detection for synchronization
Chirp detection for synchronization
(OP)
Hello,
I am currently doing an internship on marine acoustics and I am facing some difficulties.
The transmitted signal is composed of 3 tones (1sec) then 2 chirp signals (or LFM) (50ms each)then the data I am supposed to process. So I need to find where the chirps are on my received signal to be able to demodulate the data. I know some techniques : matched-filters using correlation function in Matlab but it didn't work. FYI I know the Bandwidth (4kHz) and the time duration (50ms) of the chirp signal.
Thank you in advance for your help.
I am currently doing an internship on marine acoustics and I am facing some difficulties.
The transmitted signal is composed of 3 tones (1sec) then 2 chirp signals (or LFM) (50ms each)then the data I am supposed to process. So I need to find where the chirps are on my received signal to be able to demodulate the data. I know some techniques : matched-filters using correlation function in Matlab but it didn't work. FYI I know the Bandwidth (4kHz) and the time duration (50ms) of the chirp signal.
Thank you in advance for your help.





RE: Chirp detection for synchronization
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Chirp detection for synchronization
RE: Chirp detection for synchronization
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Chirp detection for synchronization
I figured out why the frequency response with the matlab chirp function is weird : it just duplicates the chirp signal periodically hence the triangular signal (duplication of lines = triangular signal)
RE: Chirp detection for synchronization
The cross correlation between signals called JustAChirpAndABunchOfZeros and TheSignalTheyWantMeToAnalyse will tell you where to find the chirp in the latter.
Of course there are about a zillion other ways of solving this, but I think it is just a 3 or 4 liner in matlab.
Cheers
Greg Locock
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RE: Chirp detection for synchronization
Good luck!
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Chirp detection for synchronization
RE: Chirp detection for synchronization
RE: Chirp detection for synchronization
You have a problem with the discussion here?
These fora are for practicing engineers, not students. Internships are a bridge between the two, but in the end it's a way to get on-the-job experience while learning as a student. It quickly became obvious the OP did not have a good grasp of the fundamental concepts necessary to perform his main line of work, and in those cases it solves nothing to provide a canned answer... the student learns little. In those cases, it's the mentor's job to help guide him, not ours.
Doing otherwise leads to more and more students flooding the forum looking for an easy answer without taking the time to understand what they're asking.
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Chirp detection for synchronization
John D
RE: Chirp detection for synchronization
RE: Chirp detection for synchronization
Did you ever stop to think the next generation can't cut the mustard because some members of our generation keep giving them the easy way out instead of helping them learn the underlying theory?
If you want to spend a great deal of your time helping what will be an exponentially growing group of students coming to your help site, knock yourself out... just don't do it here.
Dan - Owner

http://www.Hi-TecDesigns.com